601
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Altered Resting-State Connectivity within Executive Networks after Aneurysmal Subarachnoid Hemorrhage. PLoS One 2015; 10:e0130483. [PMID: 26172281 PMCID: PMC4501762 DOI: 10.1371/journal.pone.0130483] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 05/19/2015] [Indexed: 01/02/2023] Open
Abstract
Aneurysmal subarachnoid hemorrhage (aSAH) is associated with significant mortality rates, and most survivors experience significant cognitive deficits across multiple domains, including executive function. It is critical to determine the neural basis for executive deficits in aSAH, in order to better understand and improve patient outcomes. This study is the first examination of resting-state functional Magnetic Resonance Imaging in a group of aSAH patients, used to characterize changes in functional connectivity of the frontoparietal network. We scanned 14 aSAH patients and 14 healthy controls, and divided patients into “impaired” and “unimpaired” groups based on a composite executive function score. Impaired patients exhibited significantly lower quality of life and neuropsychological impairment relative to controls, across multiple domains. Seed-based functional connectivity analysis demonstrated that unimpaired patients were not significantly different from controls, but impaired patients had increased frontoparietal connectivity. Patients evidenced increased frontoparietal connectivity as a function of decreased executive function and decreased mood (i.e. quality of life). In addition, T1 morphometric analysis demonstrated that these changes are not attributable to local cortical atrophy among aSAH patients. These results establish significant, reliable changes in the endogenous brain dynamics of aSAH patients, that are related to cognitive and mood outcomes.
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602
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Holper L, Scholkmann F, Seifritz E. Time-frequency dynamics of the sum of intra- and extracerebral hemodynamic functional connectivity during resting-state and respiratory challenges assessed by multimodal functional near-infrared spectroscopy. Neuroimage 2015; 120:481-92. [PMID: 26169319 DOI: 10.1016/j.neuroimage.2015.07.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 06/29/2015] [Accepted: 07/07/2015] [Indexed: 12/13/2022] Open
Abstract
Monitoring respiratory processes is important for evaluating neuroimaging data, given their influence on time-frequency dynamics of intra- and extracerebral hemodynamics. Here we investigated the time-frequency dynamics of the sum of intra- and extracerebral hemodynamic functional connectivity states during hypo- and hypercapnia by using three different respiratory challenge tasks (i.e., hyperventilation, breath-holding, and rebreathing) compared to resting-state. The sum of intra- and extracerebral hemodynamic responses were assessed using functional near-infrared spectroscopy (fNIRS) within two regions of interest (i.e., the dorsolateral and the medial prefrontal cortex). Time-frequency fNIRS analysis was performed based on wavelet transform coherence to quantify functional connectivity in terms of positive and negative phase-coupling within each region of interest. Physiological measures were assessed in the form of partial end-tidal carbon dioxide, heart rate, arterial tissue oxygen saturation, and respiration rate. We found that the three respiration challenges modulated time-frequency dynamics differently with respect to resting-state: 1) Hyperventilation and breath-holding exhibited inverse patterns of positive and negative phase-coupling. 2) In contrast, rebreathing had no significant effect. 3) Low-frequency oscillations contributed to a greater extent to time-frequency dynamics compared to high-frequency oscillations. The results highlight that there exist distinct differences in time-frequency dynamics of the sum of intra- and extracerebral functional connectivity not only between hypo- (hyperventilation) and hypercapnia but also between different states of hypercapnia (breath-holding versus rebreathing). This suggests that a multimodal assessment of intra-/extracerebral and systemic physiological changes during respiratory challenges compared to resting-state may have potential use in the differentiation between physiological and pathological respiratory behavior accompanied by the psycho-physiological state of a human.
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Affiliation(s)
- L Holper
- Department of Psychiatry, Psychotherapy, and Psychosomatics, University Hospital of Psychiatry Zurich, Lenggstrasse 31, 8032 Zurich, Switzerland.
| | - F Scholkmann
- Biomedical Optics Research Laboratory, Division of Neonatology, University Hospital Zurich, University of Zurich, Frauenklinikstrasse 10, 8091 Zurich, Switzerland
| | - E Seifritz
- Department of Psychiatry, Psychotherapy, and Psychosomatics, University Hospital of Psychiatry Zurich, Lenggstrasse 31, 8032 Zurich, Switzerland
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603
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Metabolic connectivity as index of verbal working memory. J Cereb Blood Flow Metab 2015; 35:1122-6. [PMID: 25785830 PMCID: PMC4640275 DOI: 10.1038/jcbfm.2015.40] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 01/20/2015] [Accepted: 02/16/2015] [Indexed: 11/08/2022]
Abstract
Positron emission tomography (PET) data are commonly analyzed in terms of regional intensity, while covariant information is not taken into account. Here, we searched for network correlates of healthy cognitive function in resting state PET data. PET with [(18)F]-fluorodeoxyglucose and a test of verbal working memory (WM) were administered to 35 young healthy adults. Metabolic connectivity was modeled at a group level using sparse inverse covariance estimation. Among 13 WM-relevant Brodmann areas (BAs), 6 appeared to be robustly connected. Connectivity within this network was significantly stronger in subjects with above-median WM performance. In respect to regional intensity, i.e., metabolism, no difference between groups was found. The results encourage examination of covariant patterns in FDG-PET data from non-neurodegenerative populations.
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604
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Singh S, Kumar M, Modi S, Kaur P, Shankar LR, Khushu S. Alterations of Functional Connectivity Among Resting-State Networks in Hypothyroidism. J Neuroendocrinol 2015; 27:609-15. [PMID: 25855375 DOI: 10.1111/jne.12282] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 02/26/2015] [Accepted: 04/02/2015] [Indexed: 11/30/2022]
Abstract
Hypothyroidism affects brain functioning as suggested by various neuroimaging studies. The primary focus of the present study was to examine whether hypothyroidism would impact connectivity among resting-state networks (RSNs) using resting-state functional magnetic resonance imaging (rsfMRI). Twenty-two patients with hypothyroidism and 22 healthy controls were recruited and scanned using rsfMRI. The data were analysed using independent component analysis and a dual regression approach that was applied on five RSNs that were identified using fsl software (http://fsl.fmrib.ox.ac.uk). Hypothyroid patients showed significantly decreased functional connectivity in the regions of the right frontoparietal network (frontal pole), the medial visual network (lateral occipital gyrus, precuneus cortex and cuneus) and the motor network (precentral gyrus, postcentral gyrus, precuneus cortex, paracingulate gyrus, cingulate gyrus and supramarginal gyrus) compared to healthy controls. The reduced functional connectivity in the right frontoparietal network, the medial visual network and the motor network suggests neurocognitive alterations in hypothyroid patients in the corresponding functions. However, the study would be further continued to investigate the effects of thyroxine treatment and correlation with neurocognitive scores. The findings of the present study provide further interesting insights into our understanding of the action of thyroid hormone on the adult human brain.
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Affiliation(s)
- S Singh
- NMR Research Centre, Institute of Nuclear Medicine and Allied Sciences (INMAS), Timarpur, Delhi, India
| | - M Kumar
- NMR Research Centre, Institute of Nuclear Medicine and Allied Sciences (INMAS), Timarpur, Delhi, India
| | - S Modi
- NMR Research Centre, Institute of Nuclear Medicine and Allied Sciences (INMAS), Timarpur, Delhi, India
| | - P Kaur
- NMR Research Centre, Institute of Nuclear Medicine and Allied Sciences (INMAS), Timarpur, Delhi, India
| | - L R Shankar
- Thyroid Research Centre, Timarpur, Delhi, India
| | - S Khushu
- NMR Research Centre, Institute of Nuclear Medicine and Allied Sciences (INMAS), Timarpur, Delhi, India
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605
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Córdova-Palomera A, Tornador C, Falcón C, Bargalló N, Nenadic I, Deco G, Fañanás L. Altered amygdalar resting-state connectivity in depression is explained by both genes and environment. Hum Brain Mapp 2015; 36:3761-76. [PMID: 26096943 DOI: 10.1002/hbm.22876] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Revised: 05/05/2015] [Accepted: 06/02/2015] [Indexed: 12/19/2022] Open
Abstract
Recent findings indicate that alterations of the amygdalar resting-state fMRI connectivity play an important role in the etiology of depression. While both depression and resting-state brain activity are shaped by genes and environment, the relative contribution of genetic and environmental factors mediating the relationship between amygdalar resting-state connectivity and depression remain largely unexplored. Likewise, novel neuroimaging research indicates that different mathematical representations of resting-state fMRI activity patterns are able to embed distinct information relevant to brain health and disease. The present study analyzed the influence of genes and environment on amygdalar resting-state fMRI connectivity, in relation to depression risk. High-resolution resting-state fMRI scans were analyzed to estimate functional connectivity patterns in a sample of 48 twins (24 monozygotic pairs) informative for depressive psychopathology (6 concordant, 8 discordant and 10 healthy control pairs). A graph-theoretical framework was employed to construct brain networks using two methods: (i) the conventional approach of filtered BOLD fMRI time-series and (ii) analytic components of this fMRI activity. Results using both methods indicate that depression risk is increased by environmental factors altering amygdalar connectivity. When analyzing the analytic components of the BOLD fMRI time-series, genetic factors altering the amygdala neural activity at rest show an important contribution to depression risk. Overall, these findings show that both genes and environment modify different patterns the amygdala resting-state connectivity to increase depression risk. The genetic relationship between amygdalar connectivity and depression may be better elicited by examining analytic components of the brain resting-state BOLD fMRI signals.
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Affiliation(s)
- Aldo Córdova-Palomera
- Unidad de Antropología, Departamento de Biología Animal, Facultad de Biología and Instituto de Biomedicina (IBUB), Universitat de Barcelona, Barcelona, Spain.,Centro de Investigaciones Biomédicas en Red de Salud Mental (CIBERSAM), Madrid, Spain
| | - Cristian Tornador
- Center for Brain and Cognition, Computational Neuroscience Group, Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona, Spain
| | - Carles Falcón
- Medical Image Core facility, the Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.,Centro de Investigación Biomédica en Red en Bioingeniería, Biomedicina y Nanomedicina (CIBER-BBN), Zaragoza, Spain
| | - Nuria Bargalló
- Centro de Investigaciones Biomédicas en Red de Salud Mental (CIBERSAM), Madrid, Spain.,Medical Image Core facility, the Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.,Centro de Diagnóstico por Imagen, Hospital Clínico, Barcelona, Spain
| | - Igor Nenadic
- Department of Psychiatry and Psychotherapy, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany
| | - Gustavo Deco
- Center for Brain and Cognition, Computational Neuroscience Group, Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona, Spain.,Institució Catalana de la Recerca i Estudis Avançats (ICREA), Universitat Pompeu Fabra, Barcelona, Spain
| | - Lourdes Fañanás
- Unidad de Antropología, Departamento de Biología Animal, Facultad de Biología and Instituto de Biomedicina (IBUB), Universitat de Barcelona, Barcelona, Spain.,Centro de Investigaciones Biomédicas en Red de Salud Mental (CIBERSAM), Madrid, Spain
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606
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Kornfeld S, Delgado Rodríguez JA, Everts R, Kaelin-Lang A, Wiest R, Weisstanner C, Mordasini P, Steinlin M, Grunt S. Cortical reorganisation of cerebral networks after childhood stroke: impact on outcome. BMC Neurol 2015; 15:90. [PMID: 26058895 PMCID: PMC4466862 DOI: 10.1186/s12883-015-0309-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 03/17/2015] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Recovery after arterial ischaemic stroke is known to largely depend on the plastic properties of the brain. The present study examines changes in the network topography of the developing brain after stroke. Effects of brain damage are best assessed by examining entire networks rather than single sites of structural lesions. Relating these changes to post-stroke neuropsychological variables and motor abilities will improve understanding of functional plasticity after stroke. Inclusion of healthy controls will provide additional insight into children's normal brain development. Resting state functional magnetic resonance imaging is a valid approach to topographically investigate the reorganisation of functional networks after a brain lesion. Transcranial magnetic stimulation provides complementary output information. This study will investigate functional reorganisation after paediatric arterial ischaemic stroke by means of resting state functional magnetic resonance imaging and transcranial magnetic stimulation in a cross-sectional plus longitudinal study design. The general aim of this study is to better understand neuroplasticity of the developing brain after stroke in order to develop more efficacious therapy and to improve the post-stroke functional outcome. METHODS The cross-sectional part of the study will investigate the functional cerebral networks of 35 children with chronic arterial ischaemic stroke (time of the lesion >2 years). In the longitudinal part, 15 children with acute arterial ischaemic stroke (shortly after the acute phase of the stroke) will be included and investigations will be performed 3 times within the subsequent 9 months. We will also recruit 50 healthy controls, matched for age and sex. The neuroimaging and neurophysiological data will be correlated with neuropsychological and neurological variables. DISCUSSION This study is the first to combine resting state functional magnetic resonance imaging and transcranial magnetic stimulation in a paediatric population diagnosed with arterial ischaemic stroke. Thus, this study has the potential to uniquely contribute to the understanding of neuronal plasticity in the brains of healthy children and those with acute or chronic brain injury. It is expected that the results will lead to the development of optimal interventions after arterial ischaemic stroke.
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Affiliation(s)
- Salome Kornfeld
- Division of Neuropaediatrics, Development and Rehabilitation, Children's University Hospital, Inselspital, Bern, Switzerland. .,Center for Cognition, Learning and Memory, University of Bern, Bern, Switzerland.
| | - Juan Antonio Delgado Rodríguez
- Division of Neuropaediatrics, Development and Rehabilitation, Children's University Hospital, Inselspital, Bern, Switzerland. .,Graduate School for Health Sciences, University of Bern, Bern, Switzerland.
| | - Regula Everts
- Division of Neuropaediatrics, Development and Rehabilitation, Children's University Hospital, Inselspital, Bern, Switzerland. .,Center for Cognition, Learning and Memory, University of Bern, Bern, Switzerland.
| | | | - Roland Wiest
- Department of Diagnostic and Interventional Neuroradiology, University Hospital, Inselspital, Bern, Switzerland.
| | - Christian Weisstanner
- Department of Diagnostic and Interventional Neuroradiology, University Hospital, Inselspital, Bern, Switzerland.
| | - Pasquale Mordasini
- Department of Diagnostic and Interventional Neuroradiology, University Hospital, Inselspital, Bern, Switzerland.
| | - Maja Steinlin
- Division of Neuropaediatrics, Development and Rehabilitation, Children's University Hospital, Inselspital, Bern, Switzerland. .,Center for Cognition, Learning and Memory, University of Bern, Bern, Switzerland.
| | - Sebastian Grunt
- Division of Neuropaediatrics, Development and Rehabilitation, Children's University Hospital, Inselspital, Bern, Switzerland.
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607
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Su L, An J, Ma Q, Qiu S, Hu D. Influence of Resting-State Network on Lateralization of Functional Connectivity in Mesial Temporal Lobe Epilepsy. AJNR Am J Neuroradiol 2015; 36:1479-87. [PMID: 26021622 DOI: 10.3174/ajnr.a4346] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 01/25/2015] [Indexed: 02/05/2023]
Abstract
BACKGROUND AND PURPOSE Although most studies on epilepsy have focused on the epileptogenic zone, epilepsy is a system-level disease characterized by aberrant neuronal synchronization among groups of neurons. Increasingly, studies have indicated that mesial temporal lobe epilepsy may be a network-level disease; however, few investigations have examined resting-state functional connectivity of the entire brain, particularly in patients with mesial temporal lobe epilepsy and hippocampal sclerosis. This study primarily investigated whole-brain resting-state functional connectivity abnormality in patients with mesial temporal lobe epilepsy and right hippocampal sclerosis during the interictal period. MATERIALS AND METHODS We investigated resting-state functional connectivity of 21 patients with mesial temporal lobe epilepsy with right hippocampal sclerosis and 21 neurologically healthy controls. A multivariate pattern analysis was used to identify the functional connections that most clearly differentiated patients with mesial temporal lobe epilepsy with right hippocampal sclerosis from controls. RESULTS Discriminative analysis of functional connections indicated that the patients with mesial temporal lobe epilepsy with right hippocampal sclerosis exhibited decreased resting-state functional connectivity within the right hemisphere and increased resting-state functional connectivity within the left hemisphere. Resting-state network analysis suggested that the internetwork connections typically obey the hemispheric lateralization trend and most of the functional connections that disturb the lateralization trend are the intranetwork ones. CONCLUSIONS The current findings suggest that weakening of the resting-state functional connectivity associated with the right hemisphere appears to strengthen resting-state functional connectivity on the contralateral side, which may be related to the seizure-induced damage and underlying compensatory mechanisms. Resting-state network-based analysis indicated that the compensatory mechanism among different resting-state networks may disturb the hemispheric lateralization.
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Affiliation(s)
- L Su
- From the College of Mechatronics and Automation (L.S., Q.M., D.H.), National University of Defense Technology, Changsha, Hunan, People's Republic of China Department of Information Engineering (L.S.), Officers College of Chinese Armed Police Force, Chengdu, Sichuan, China
| | - J An
- Department of Medical Imaging (J.A., S.Q.), First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, People's Republic of China
| | - Q Ma
- From the College of Mechatronics and Automation (L.S., Q.M., D.H.), National University of Defense Technology, Changsha, Hunan, People's Republic of China
| | - S Qiu
- Department of Medical Imaging (J.A., S.Q.), First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, People's Republic of China
| | - D Hu
- From the College of Mechatronics and Automation (L.S., Q.M., D.H.), National University of Defense Technology, Changsha, Hunan, People's Republic of China
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608
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van Duijvenvoorde ACK, Achterberg M, Braams BR, Peters S, Crone EA. Testing a dual-systems model of adolescent brain development using resting-state connectivity analyses. Neuroimage 2015; 124:409-420. [PMID: 25969399 DOI: 10.1016/j.neuroimage.2015.04.069] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 03/24/2015] [Accepted: 04/27/2015] [Indexed: 11/16/2022] Open
Abstract
The current study aimed to test a dual-systems model of adolescent brain development by studying changes in intrinsic functional connectivity within and across networks typically associated with cognitive-control and affective-motivational processes. To this end, resting-state and task-related fMRI data were collected of 269 participants (ages 8-25). Resting-state analyses focused on seeds derived from task-related neural activation in the same participants: the dorsal lateral prefrontal cortex (dlPFC) from a cognitive rule-learning paradigm and the nucleus accumbens (NAcc) from a reward-paradigm. Whole-brain seed-based resting-state analyses showed an age-related increase in dlPFC connectivity with the caudate and thalamus, and an age-related decrease in connectivity with the (pre)motor cortex. nAcc connectivity showed a strengthening of connectivity with the dorsal anterior cingulate cortex (ACC) and subcortical structures such as the hippocampus, and a specific age-related decrease in connectivity with the ventral medial PFC (vmPFC). Behavioral measures from both functional paradigms correlated with resting-state connectivity strength with their respective seed. That is, age-related change in learning performance was mediated by connectivity between the dlPFC and thalamus, and age-related change in winning pleasure was mediated by connectivity between the nAcc and vmPFC. These patterns indicate (i) strengthening of connectivity between regions that support control and learning, (ii) more independent functioning of regions that support motor and control networks, and (iii) more independent functioning of regions that support motivation and valuation networks with age. These results are interpreted vis-à-vis a dual-systems model of adolescent brain development.
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Affiliation(s)
- A C K van Duijvenvoorde
- Institute of Psychology, Leiden University, and The Netherlands Leiden Institute for Brain and Cognition (LIBC), Leiden, The Netherlands.
| | - M Achterberg
- Institute of Psychology, Leiden University, and The Netherlands Leiden Institute for Brain and Cognition (LIBC), Leiden, The Netherlands
| | - B R Braams
- Institute of Psychology, Leiden University, and The Netherlands Leiden Institute for Brain and Cognition (LIBC), Leiden, The Netherlands
| | - S Peters
- Institute of Psychology, Leiden University, and The Netherlands Leiden Institute for Brain and Cognition (LIBC), Leiden, The Netherlands
| | - E A Crone
- Institute of Psychology, Leiden University, and The Netherlands Leiden Institute for Brain and Cognition (LIBC), Leiden, The Netherlands
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609
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Mabray MC, Barajas RF, Cha S. Modern brain tumor imaging. Brain Tumor Res Treat 2015; 3:8-23. [PMID: 25977902 PMCID: PMC4426283 DOI: 10.14791/btrt.2015.3.1.8] [Citation(s) in RCA: 105] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 03/17/2015] [Accepted: 03/17/2015] [Indexed: 12/16/2022] Open
Abstract
The imaging and clinical management of patients with brain tumor continue to evolve over time and now heavily rely on physiologic imaging in addition to high-resolution structural imaging. Imaging remains a powerful noninvasive tool to positively impact the management of patients with brain tumor. This article provides an overview of the current state-of-the art clinical brain tumor imaging. In this review, we discuss general magnetic resonance (MR) imaging methods and their application to the diagnosis of, treatment planning and navigation, and disease monitoring in patients with brain tumor. We review the strengths, limitations, and pitfalls of structural imaging, diffusion-weighted imaging techniques, MR spectroscopy, perfusion imaging, positron emission tomography/MR, and functional imaging. Overall this review provides a basis for understudying the role of modern imaging in the care of brain tumor patients.
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Affiliation(s)
- Marc C Mabray
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
| | - Ramon F Barajas
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
| | - Soonmee Cha
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
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610
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Goveas J, O'Dwyer L, Mascalchi M, Cosottini M, Diciotti S, De Santis S, Passamonti L, Tessa C, Toschi N, Giannelli M. Diffusion-MRI in neurodegenerative disorders. Magn Reson Imaging 2015; 33:853-76. [PMID: 25917917 DOI: 10.1016/j.mri.2015.04.006] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2014] [Revised: 04/18/2015] [Accepted: 04/19/2015] [Indexed: 12/11/2022]
Abstract
The ability to image the whole brain through ever more subtle and specific methods/contrasts has come to play a key role in understanding the basis of brain abnormalities in several diseases. In magnetic resonance imaging (MRI), "diffusion" (i.e. the random, thermally-induced displacements of water molecules over time) represents an extraordinarily sensitive contrast mechanism, and the exquisite structural detail it affords has proven useful in a vast number of clinical as well as research applications. Since diffusion-MRI is a truly quantitative imaging technique, the indices it provides can serve as potential imaging biomarkers which could allow early detection of pathological alterations as well as tracking and possibly predicting subtle changes in follow-up examinations and clinical trials. Accordingly, diffusion-MRI has proven useful in obtaining information to better understand the microstructural changes and neurophysiological mechanisms underlying various neurodegenerative disorders. In this review article, we summarize and explore the main applications, findings, perspectives as well as challenges and future research of diffusion-MRI in various neurodegenerative disorders including Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, Huntington's disease and degenerative ataxias.
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Affiliation(s)
- Joseph Goveas
- Department of Psychiatry and Behavioral Medicine, and Institute for Health and Society, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Laurence O'Dwyer
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Goethe University, Frankfurt, Germany
| | - Mario Mascalchi
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, Florence, Italy; Quantitative and Functional Neuroradiology Research Program at Meyer Children and Careggi Hospitals of Florence, Florence, Italy
| | - Mirco Cosottini
- Department of Translational Research and New Surgical and Medical Technologies, University of Pisa, Pisa, Italy; Unit of Neuroradiology, Pisa University Hospital "Azienda Ospedaliero-Universitaria Pisana", Pisa, Italy
| | - Stefano Diciotti
- Department of Electrical, Electronic, and Information Engineering "Guglielmo Marconi", University of Bologna, Cesena, Italy
| | - Silvia De Santis
- Cardiff University Brain Research Imaging Centre (CUBRIC), School of Psychology, Cardiff University, Cardiff, UK
| | - Luca Passamonti
- Institute of Bioimaging and Molecular Physiology, National Research Council, Catanzaro, Italy; Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Carlo Tessa
- Division of Radiology, "Versilia" Hospital, AUSL 12 Viareggio, Lido di Camaiore, Italy
| | - Nicola Toschi
- Department of Biomedicine and Prevention, Medical Physics Section, University of Rome "Tor Vergata", Rome, Italy; Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
| | - Marco Giannelli
- Unit of Medical Physics, Pisa University Hospital "Azienda Ospedaliero-Universitaria Pisana", Pisa, Italy.
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611
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Khazaee A, Ebrahimzadeh A, Babajani-Feremi A. Identifying patients with Alzheimer's disease using resting-state fMRI and graph theory. Clin Neurophysiol 2015; 126:2132-41. [PMID: 25907414 DOI: 10.1016/j.clinph.2015.02.060] [Citation(s) in RCA: 146] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 01/26/2015] [Accepted: 02/03/2015] [Indexed: 01/26/2023]
Abstract
OBJECTIVE Study of brain network on the basis of resting-state functional magnetic resonance imaging (fMRI) has provided promising results to investigate changes in connectivity among different brain regions because of diseases. Graph theory can efficiently characterize different aspects of the brain network by calculating measures of integration and segregation. METHOD In this study, we combine graph theoretical approaches with advanced machine learning methods to study functional brain network alteration in patients with Alzheimer's disease (AD). Support vector machine (SVM) was used to explore the ability of graph measures in diagnosis of AD. We applied our method on the resting-state fMRI data of twenty patients with AD and twenty age and gender matched healthy subjects. The data were preprocessed and each subject's graph was constructed by parcellation of the whole brain into 90 distinct regions using the automated anatomical labeling (AAL) atlas. The graph measures were then calculated and used as the discriminating features. Extracted network-based features were fed to different feature selection algorithms to choose most significant features. In addition to the machine learning approach, statistical analysis was performed on connectivity matrices to find altered connectivity patterns in patients with AD. RESULTS Using the selected features, we were able to accurately classify patients with AD from healthy subjects with accuracy of 100%. CONCLUSION Results of this study show that pattern recognition and graph of brain network, on the basis of the resting state fMRI data, can efficiently assist in the diagnosis of AD. SIGNIFICANCE Classification based on the resting-state fMRI can be used as a non-invasive and automatic tool to diagnosis of Alzheimer's disease.
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Affiliation(s)
- Ali Khazaee
- Department of Electrical and Computer Engineering, Babol University of Technology, Iran.
| | - Ata Ebrahimzadeh
- Department of Electrical and Computer Engineering, Babol University of Technology, Iran
| | - Abbas Babajani-Feremi
- Department of Pediatrics, Division of Clinical Neurosciences, University of Tennessee Health Science Center, Memphis, TN, USA; Neuroscience Institute, Le Bonheur Children's Hospital, Memphis, TN, USA
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612
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Graham AM, Pfeifer JH, Fisher PA, Lin W, Gao W, Fair DA. The potential of infant fMRI research and the study of early life stress as a promising exemplar. Dev Cogn Neurosci 2015; 12:12-39. [PMID: 25459874 PMCID: PMC4385461 DOI: 10.1016/j.dcn.2014.09.005] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 09/24/2014] [Accepted: 09/29/2014] [Indexed: 01/09/2023] Open
Abstract
Functional magnetic resonance imaging (fMRI) research with infants and toddlers has increased rapidly over the past decade, and provided a unique window into early brain development. In the current report, we review the state of the literature, which has established the feasibility and utility of task-based fMRI and resting state functional connectivity MRI (rs-fcMRI) during early periods of brain maturation. These methodologies have been successfully applied beginning in the neonatal period to increase understanding of how the brain both responds to environmental stimuli, and becomes organized into large-scale functional systems that support complex behaviors. We discuss the methodological challenges posed by this promising area of research. We also highlight that despite these challenges, early work indicates a strong potential for these methods to influence multiple research domains. As an example, we focus on the study of early life stress and its influence on brain development and mental health outcomes. We illustrate the promise of these methodologies for building on, and making important contributions to, the existing literature in this field.
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Affiliation(s)
- Alice M Graham
- Department of Behavioral Neuroscience, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, United States.
| | - Jennifer H Pfeifer
- Department of Psychology, University of Oregon, 1715 Franklin Boulevard, Eugene, OR 97403, United States
| | - Philip A Fisher
- Department of Psychology, University of Oregon, 1715 Franklin Boulevard, Eugene, OR 97403, United States
| | - Weili Lin
- Departments of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, United States
| | - Wei Gao
- Departments of Radiology and Biomedical Research Imaging Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, United States
| | - Damien A Fair
- Department of Psychology, University of Oregon, 1715 Franklin Boulevard, Eugene, OR 97403, United States; Department of Psychiatry, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, United States; Advanced Imaging Research Center, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, United States
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613
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Peeters SCT, van de Ven V, Gronenschild EHBM, Patel AX, Habets P, Goebel R, van Os J, Marcelis M. Default mode network connectivity as a function of familial and environmental risk for psychotic disorder. PLoS One 2015; 10:e0120030. [PMID: 25790002 PMCID: PMC4366233 DOI: 10.1371/journal.pone.0120030] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 01/19/2015] [Indexed: 12/21/2022] Open
Abstract
Background Research suggests that altered interregional connectivity in specific networks, such as the default mode network (DMN), is associated with cognitive and psychotic symptoms in schizophrenia. In addition, frontal and limbic connectivity alterations have been associated with trauma, drug use and urban upbringing, though these environmental exposures have never been examined in relation to DMN functional connectivity in psychotic disorder. Methods Resting-state functional MRI scans were obtained from 73 patients with psychotic disorder, 83 non-psychotic siblings of patients with psychotic disorder and 72 healthy controls. Posterior cingulate cortex (PCC) seed-based correlation analysis was used to estimate functional connectivity within the DMN. DMN functional connectivity was examined in relation to group (familial risk), group × environmental exposure (to cannabis, developmental trauma and urbanicity) and symptomatology. Results There was a significant association between group and PCC connectivity with the inferior parietal lobule (IPL), the precuneus (PCu) and the medial prefrontal cortex (MPFC). Compared to controls, patients and siblings had increased PCC connectivity with the IPL, PCu and MPFC. In the IPL and PCu, the functional connectivity of siblings was intermediate to that of controls and patients. No significant associations were found between DMN connectivity and (subclinical) psychotic/cognitive symptoms. In addition, there were no significant interactions between group and environmental exposures in the model of PCC functional connectivity. Discussion Increased functional connectivity in individuals with (increased risk for) psychotic disorder may reflect trait-related network alterations. The within-network “connectivity at rest” intermediate phenotype was not associated with (subclinical) psychotic or cognitive symptoms. The association between familial risk and DMN connectivity was not conditional on environmental exposure.
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Affiliation(s)
- Sanne C. T. Peeters
- Dept. of Psychiatry and Psychology, School for Mental Health and Neuroscience, EURON, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Vincent van de Ven
- Dept. of Cognitive Neuroscience, Faculty of Psychology and Neuroscience, University of Maastricht, Maastricht, The Netherlands
| | - Ed H. B. M Gronenschild
- Dept. of Psychiatry and Psychology, School for Mental Health and Neuroscience, EURON, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Ameera X. Patel
- Behavioral and Clinical Neuroscience Institute, Department of Psychiatry, University of Cambridge, Cambridge, United Kingdom
| | - Petra Habets
- Dept. of Psychiatry and Psychology, School for Mental Health and Neuroscience, EURON, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Rainer Goebel
- Dept. of Cognitive Neuroscience, Faculty of Psychology and Neuroscience, University of Maastricht, Maastricht, The Netherlands
| | - Jim van Os
- Dept. of Psychiatry and Psychology, School for Mental Health and Neuroscience, EURON, Maastricht University Medical Center, Maastricht, The Netherlands
- King's College London, King's Health Partners, Department of Psychosis Studies Institute of Psychiatry, London, United Kingdom
| | - Machteld Marcelis
- Dept. of Psychiatry and Psychology, School for Mental Health and Neuroscience, EURON, Maastricht University Medical Center, Maastricht, The Netherlands
- Institute for Mental Health Care Eindhoven (GGzE), Eindhoven, The Netherlands
- * E-mail:
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614
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Song H, Zou Z, Kou J, Liu Y, Yang L, Zilverstand A, d'Oleire Uquillas F, Zhang X. Love-related changes in the brain: a resting-state functional magnetic resonance imaging study. Front Hum Neurosci 2015; 9:71. [PMID: 25762915 PMCID: PMC4327739 DOI: 10.3389/fnhum.2015.00071] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Accepted: 01/28/2015] [Indexed: 01/06/2023] Open
Abstract
Romantic love is a motivational state associated with a desire to enter or maintain a close relationship with a specific other person. Functional magnetic resonance imaging (fMRI) studies have found activation increases in brain regions involved in the processing of reward, motivation and emotion regulation, when romantic lovers view photographs of their partners. However, not much is known about whether romantic love affects the brain’s functional architecture during rest. In the present study, resting state functional magnetic resonance imaging (rsfMRI) data was collected to compare the regional homogeneity (ReHo) and functional connectivity (FC) across an “in-love” group (LG, N = 34, currently intensely in love), an “ended-love” group (ELG, N = 34, ended romantic relationship recently), and a “single” group (SG, N = 32, never fallen in love). Results show that: (1) ReHo of the left dorsal anterior cingulate cortex (dACC) was significantly increased in the LG (in comparison to the ELG and the SG); (2) ReHo of the left dACC was positively correlated with length of time in love in the LG, and negatively correlated with the lovelorn duration since breakup in the ELG; (3) FC within the reward, motivation, and emotion regulation network (dACC, insula, caudate, amygdala, and nucleus accumbens) as well as FC in the social cognition network [temporo-parietal junction (TPJ), posterior cingulate cortex (PCC), medial prefrontal cortex (MPFC), inferior parietal, precuneus, and temporal lobe] was significantly increased in the LG (in comparison to the ELG and SG); (4) in most regions within both networks FC was positively correlated with the duration of love in the LG but negatively correlated with the lovelorn duration of time since breakup in the ELG. This study provides first empirical evidence of love-related alterations in brain functional architecture. Furthermore, the results shed light on the underlying neural mechanisms of romantic love, and demonstrate the possibility of applying a resting-state fMRI approach for investigating romantic love.
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Affiliation(s)
- Hongwen Song
- Faculty of Psychology, Southwest University, Chongqing China
| | - Zhiling Zou
- Faculty of Psychology, Southwest University, Chongqing China
| | - Juan Kou
- Faculty of Psychology, Southwest University, Chongqing China
| | - Yang Liu
- Faculty of Psychology, Southwest University, Chongqing China
| | - Lizhuang Yang
- CAS Key Laboratory of Brain Function & Disease, School of Life Sciences, University of Science and Technology of China, Anhui China
| | | | | | - Xiaochu Zhang
- CAS Key Laboratory of Brain Function & Disease, School of Life Sciences, University of Science and Technology of China, Anhui China ; CAS Center of Medical Physics and Technology, University of Science and Technology of China, Anhui China ; School of Humanities and Social Science, University of Science and Technology of China, Anhui China
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615
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Maesawa S, Bagarinao E, Fujii M, Futamura M, Motomura K, Watanabe H, Mori D, Sobue G, Wakabayashi T. Evaluation of resting state networks in patients with gliomas: connectivity changes in the unaffected side and its relation to cognitive function. PLoS One 2015; 10:e0118072. [PMID: 25659130 PMCID: PMC4319851 DOI: 10.1371/journal.pone.0118072] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 01/04/2015] [Indexed: 11/18/2022] Open
Abstract
In this study, we investigated changes in resting state networks (RSNs) in patients with gliomas located in the left hemisphere and its relation to cognitive function. We hypothesized that long distance connection, especially between hemispheres, would be affected by the presence of the tumor. We further hypothesized that these changes would correlate with, or reflect cognitive changes observed in patients with gliomas. Resting state functional MRI datasets from 12 patients and 12 healthy controls were used in the analysis. The tumor’s effect on three well-known RSNs including the default mode network (DMN), executive control network (ECN), and salience network (SN) identified using independent component analysis were investigated using dual regression analysis. Scores of neuropsychometric testing (WAIS-III and WMS-R) were also compared. Compared to the healthy control group, the patient group showed significant decrease in functional connectivity in the right angular gyrus/inferior parietal lobe of the ventral DMN and in the dorsolateral prefrontal cortex of the left ECN, whereas a significant increase in connectivity in the right ECN was observed in the right parietal lobe. Changes in connectivity in the right ECN correlated with spatial memory, while that on the left ECN correlated with attention. Connectivity changes in the ventral DMN correlated with attention, working memory, full IQ, and verbal IQ measures. Although the tumors were localized in the left side of the brain, changes in connectivity were observed in the contralateral side. Moreover, these changes correlated with some aspects of cognitive function indicating that patients with gliomas may undergo cognitive changes even in the absence of or before the onset of major symptoms. Evaluation of resting state networks could be helpful in advancing our hodological understanding of brain function in glioma cases.
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Affiliation(s)
- Satoshi Maesawa
- Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan
- Department of Neurosurgery, Nagoya University School of Medicine, Nagoya City, Aichi, Japan
- * E-mail:
| | - Epifanio Bagarinao
- Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan
| | - Masazumi Fujii
- Department of Neurosurgery, Nagoya University School of Medicine, Nagoya City, Aichi, Japan
| | - Miyako Futamura
- Department of Rehabilitation, Nagoya Hospital Organization, Nagoya Medical Center, Nagoya City, Aichi, Japan
| | - Kazuya Motomura
- Department of Neurosurgery, Nagoya University School of Medicine, Nagoya City, Aichi, Japan
| | - Hirohisa Watanabe
- Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan
- Department Neurology, Nagoya University School of Medicine, Nagoya City, Aichi, Japan
| | - Daisuke Mori
- Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan
| | - Gen Sobue
- Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan
- Department Neurology, Nagoya University School of Medicine, Nagoya City, Aichi, Japan
| | - Toshihiko Wakabayashi
- Brain and Mind Research Center, Nagoya University, Nagoya City, Aichi, Japan
- Department of Neurosurgery, Nagoya University School of Medicine, Nagoya City, Aichi, Japan
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616
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Wang LL, Leach JL, Breneman JC, McPherson CM, Gaskill-Shipley MF. Critical role of imaging in the neurosurgical and radiotherapeutic management of brain tumors. Radiographics 2015; 34:702-21. [PMID: 24819790 DOI: 10.1148/rg.343130156] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Lily L Wang
- From the Departments of Radiology (L.L.W., J.L.L., M.F.G.S.), Radiation Oncology (J.C.B.), and Neurosurgery (C.M.M.), University of Cincinnati College of Medicine, 234 Goodman St, Cincinnati, OH 45267-0761; Brain Tumor Center at the UC Neuroscience Institute and UC Cancer Institute (L.L.W., J.L.L., J.C.B., C.M.M., M.F.G.S.); and Departments of Radiology (J.L.L) and Radiation Oncology (J.C.B.), Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
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617
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Dichter GS, Gibbs D, Smoski MJ. A systematic review of relations between resting-state functional-MRI and treatment response in major depressive disorder. J Affect Disord 2015; 172:8-17. [PMID: 25451389 PMCID: PMC4375066 DOI: 10.1016/j.jad.2014.09.028] [Citation(s) in RCA: 233] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 08/13/2014] [Accepted: 09/02/2014] [Indexed: 12/19/2022]
Abstract
BACKGROUND Resting-state functional magnetic resonance imaging (fMRI) is a promising predictor of treatment response in major depressive disorder (MDD). METHODS A search for papers published in English was conducted using PubMed with the following words: depression, treatment, resting-state, connectivity, and fMRI. Findings from 21 studies of relations between resting-state fMRI and treatment response in MDD are presented, and common findings and themes are discussed. RESULTS The use of resting-state fMRI in research on MDD treatment response has yielded a number of consistent findings that provide a basis for understanding the potential mechanisms of action of antidepressant treatment response. These included (1) associations between response to antidepressant medications and increased functional connectivity between frontal and limbic brain regions, possibly resulting in greater inhibitory control over neural circuits that process emotions; (2) connectivity of visual recognition circuits in studies that compared treatment resistant and treatment sensitive patients; (3) response to TMS was consistently predicted by subcallosal cortex connectivity; and (4) hyperconnectivity of the default mode network and hypoconnectivity of the cognitive control network differentiated treatment-resistant from treatment-sensitive MDD patients. LIMITATIONS There was also considerable variability between studies with respect to study designs and analytic strategies that made direct comparisons across all studies difficult. CONCLUSIONS Continued standardization of study designs and analytic strategies as well as aggregation of larger datasets will allow the field to better elucidate the potential mechanisms of action of treatment response in patients with MDD to ultimately generate algorithms to predict which patients will respond to which antidepressant treatments.
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Affiliation(s)
- Gabriel S. Dichter
- Department of Psychiatry, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA,Correspondence: Dr. Gabriel S. Dichter, , Department of Psychiatry, University of North Carolina at Chapel Hill School of Medicine, CB 7255, Chapel Hill, NC 27599-7255, USA
| | - Devin Gibbs
- Department of Psychiatry, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Moria J. Smoski
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham NC 27710, USA
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618
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Krishnan P, Muthusami P, Heyn C, Shroff M. Advances in pediatric neuroimaging. Indian J Pediatr 2015; 82:154-65. [PMID: 25557178 DOI: 10.1007/s12098-014-1657-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Accepted: 12/03/2014] [Indexed: 12/19/2022]
Abstract
Conventional MRI protocols are an integral part of routine clinical imaging in pediatric patients. The advent of several newer MRI techniques provides crucial insight into the structural integrity and functional aspects of the developing brain, especially with the introduction of 3T MRI systems in clinical practice. The field of pediatric neuroimaging continues to evolve, with greater emphasis on high spatial resolution, faster scan time, as well as a quest for visualization of the functional aspects of the human brain. MR vendors are increasingly focusing on optimizing MR technology to make it suitable for children, in whom as compared to adults the head size is usually smaller and demonstrates inherent neuroanatomical differences relating to brain development. The eventual goal of these advances would be to evolve as potential biomarkers for predicting neurodevelopment outcomes and prognostication, in addition to their utility in routine diagnostic and therapeutic decision-making. Advanced MR techniques like diffusion tensor imaging, functional MRI, MR perfusion, spectroscopy, volumetric imaging and arterial spin labeling add to our understanding of normal brain development and pathophysiology of various neurological disease processes. This review is primarily focused on outlining advanced MR techniques and their current and potential pediatric neuroimaging applications as well as providing a brief overview of advances in hardware and machine design.
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Affiliation(s)
- Pradeep Krishnan
- Division of Pediatric Neuroradiology, Department of Diagnostic Imaging, Hospital for Sick Children, Toronto, ON, Canada,
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619
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Romero K, Lobaugh NJ, Black SE, Ehrlich L, Feinstein A. Old wine in new bottles: validating the clinical utility of SPECT in predicting cognitive performance in mild traumatic brain injury. Psychiatry Res 2015; 231:15-24. [PMID: 25466236 DOI: 10.1016/j.pscychresns.2014.11.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 10/21/2014] [Accepted: 11/06/2014] [Indexed: 11/16/2022]
Abstract
The neural underpinnings of cognitive dysfunction in mild traumatic brain injury (TBI) are not fully understood. Consequently, patient prognosis using existing clinical imaging is somewhat imprecise. Single photon emission computed tomography (SPECT) is a frequently employed investigation in this population, notwithstanding uncertainty over the clinical utility of the data obtained. In this study, subjects with mild TBI underwent (99m)Tc-ECD SPECT scanning, and were administered a brief battery of cognitive tests and self-report symptom scales of concussion and emotional distress. Testing took place 2 weeks (n=84) and 1 year (n=49) post-injury. Multivariate analysis (i.e., partial least squares analysis) revealed that frontal perfusion in right superior frontal and middle frontal gyri predicted poorer performance on the Stroop test, an index of executive function, both at initial and follow-up testing. Conversely, SPECT scans categorized as normal or abnormal by radiologists did not differentiate cognitively impaired from intact subjects. These results demonstrate the clinical utility of SPECT in mild TBI, but only when data are subjected to blood flow quantification analysis.
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Affiliation(s)
- Kristoffer Romero
- Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, ON, Canada M4N 3M5.
| | - Nancy J Lobaugh
- Centre for Addiction and Mental Health, 250 College Street, Toronto, ON, Canada M5T 1R8
| | - Sandra E Black
- Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, ON, Canada M4N 3M5; L.C. Campbell Cognitive Neurology Research Unit, 2075 Bayview Avenue, Toronto, ON, Canada M4N 3M5; Heart and Stroke Foundation Centre for Stroke Recovery, 2075 Bayview Avenue, Toronto, ON, Canada M4N 3M5
| | - Lisa Ehrlich
- Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, ON, Canada M4N 3M5
| | - Anthony Feinstein
- Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, ON, Canada M4N 3M5
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620
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Fein G. Neuroplasticity in Human Alcoholism: Studies of Extended Abstinence with Potential Treatment Implications. Alcohol Res 2015; 37:125-41. [PMID: 26259093 PMCID: PMC4476599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Alcoholism is characterized by a lack of control over excessive alcohol consumption despite significant negative consequences. This impulsive and compulsive behavior may be related to functional abnormalities within networks of brain regions responsible for how we make decisions. The abnormalities may result in strengthened networks related to appetitive drive-or the need to fulfill desires-and simultaneously weakened networks that exercise control over behaviors. Studies using functional magnetic resonance imaging (fMRI) in abstinent alcoholics suggest that abstinence is associated with changes in the tone of such networks, decreasing resting tone in appetitive drive networks, and increasing resting tone in inhibitory control networks to support continued abstinence. Identifying electroencephalographic (EEG) measures of resting tone in these networks initially identified using fMRI, and establishing in longitudinal studies that these abstinence-related changes in network tone are progressive would motivate treatment initiatives to facilitate these changes in network tone, thereby supporting successful ongoing abstinence.
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621
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Altered resting-state connectivity in college students with nonclinical depressive symptoms. PLoS One 2014; 9:e114603. [PMID: 25502215 PMCID: PMC4264752 DOI: 10.1371/journal.pone.0114603] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 11/10/2014] [Indexed: 01/01/2023] Open
Abstract
Background The underlying brain basis of nonclinical depressive symptoms (nCDSs) is largely unknown. Recently, the seed-based functional connectivity (FC) approach for analyzing resting-state fMRI (rs-fMRI) data has been increasingly used to explore the neural basis of depressive disorders. Other than common seed-based FC method using an a priori seed region, we conducted FC analysis based on regions with altered spontaneous activity revealed by the fractional amplitude of low-frequency fluctuations (fALFF) approach. The aim of the present study was to provide novel insight in the underlying mechanism of nCDSs in college students. Methodology/Principal Findings A total number of 1105 college students were recruited to participant in a survey for assessing depressive symptoms. Subsequently, 17 individuals with nCDSs and 20 healthy controls (HCs) were enrolled to perform MR studies. Alternations of fALFF were identified in the right superior parietal lobule (SPL) and left lingual gyrus, both of which were used as ROIs for further FC analysis. With right SPL, compare with HCs, subjects with nCDSs showed reduced FCs in the bilateral dorsal lateral prefrontal cortex (DLPFC), left inferior frontal gurus (IFG), left premotor cortex (PMC), DMN network [i.e., bilateral precuneus, posterior cingulate cortex (PCC), right supramarginal gyrus (SMG), right parahippocampal gyrus (PHG), bilateral inferior temporal gurus (ITG)] and left cerebellum posterior lobe (CPL). In addition, increased FCs were observed between the left lingual gyrus and right fusiform gyrus as well as in the left precuneus. Conclusion/Significance Our results indicate the abnormalities of spontaneous activity in the right SPL and left lingual gyrus and their corresponding dysfunction of the brain circuits might be related to the pathophysiology of nCDSs.
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622
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Thiel A, Vahdat S. Structural and resting-state brain connectivity of motor networks after stroke. Stroke 2014; 46:296-301. [PMID: 25477218 DOI: 10.1161/strokeaha.114.006307] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Alexander Thiel
- From the Department of Neurology and Neurosurgery (A.T.) and Department of Psychology (S.V.), McGill University, Montreal, Canada; Department of Neuroscience, Jewish General Hospital, Lady Davis Institute for Medical Research, Montreal, Canada (A.T.); and Functional Neuroimaging Unit, Department of Neuroscience, University of Montreal, Montreal, Canada (S.V.).
| | - Shahabeddin Vahdat
- From the Department of Neurology and Neurosurgery (A.T.) and Department of Psychology (S.V.), McGill University, Montreal, Canada; Department of Neuroscience, Jewish General Hospital, Lady Davis Institute for Medical Research, Montreal, Canada (A.T.); and Functional Neuroimaging Unit, Department of Neuroscience, University of Montreal, Montreal, Canada (S.V.)
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623
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Dukart J, Bertolino A. When structure affects function--the need for partial volume effect correction in functional and resting state magnetic resonance imaging studies. PLoS One 2014; 9:e114227. [PMID: 25460595 PMCID: PMC4252146 DOI: 10.1371/journal.pone.0114227] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 11/05/2014] [Indexed: 12/21/2022] Open
Abstract
Both functional and also more recently resting state magnetic resonance imaging have become established tools to investigate functional brain networks. Most studies use these tools to compare different populations without controlling for potential differences in underlying brain structure which might affect the functional measurements of interest. Here, we adapt a simulation approach combined with evaluation of real resting state magnetic resonance imaging data to investigate the potential impact of partial volume effects on established functional and resting state magnetic resonance imaging analyses. We demonstrate that differences in the underlying structure lead to a significant increase in detected functional differences in both types of analyses. Largest increases in functional differences are observed for highest signal-to-noise ratios and when signal with the lowest amount of partial volume effects is compared to any other partial volume effect constellation. In real data, structural information explains about 25% of within-subject variance observed in degree centrality – an established resting state connectivity measurement. Controlling this measurement for structural information can substantially alter correlational maps obtained in group analyses. Our results question current approaches of evaluating these measurements in diseased population with known structural changes without controlling for potential differences in these measurements.
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Affiliation(s)
- Juergen Dukart
- F. Hoffmann-La Roche, pRED, Pharma Research and Early Development, NORD DTA, Grenzacherstrasse 124, 4070 Basel, Switzerland
- Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
- * E-mail:
| | - Alessandro Bertolino
- F. Hoffmann-La Roche, pRED, Pharma Research and Early Development, NORD DTA, Grenzacherstrasse 124, 4070 Basel, Switzerland
- Department of Basic Medical Science, Neuroscience and Sense Organs, University of Bari, Bari, Italy
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625
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Lang S, Duncan N, Northoff G. Resting-state functional magnetic resonance imaging: review of neurosurgical applications. Neurosurgery 2014; 74:453-64; discussion 464-5. [PMID: 24492661 DOI: 10.1227/neu.0000000000000307] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Recent research in brain imaging has highlighted the role of different neural networks in the resting state (ie, no task) in which the brain displays spontaneous low-frequency neuronal oscillations. These can be indirectly measured with resting-state functional magnetic resonance imaging, and functional connectivity can be inferred as the spatiotemporal correlations of this signal. This technique has proliferated in recent years and has allowed the noninvasive investigation of large-scale, distributed functional networks. In this review, we give a brief overview of resting-state networks and examine the use of resting-state functional magnetic resonance imaging in neurosurgical contexts, specifically with respect to neurooncology, epilepsy surgery, and deep brain stimulation. We discuss the advantages and disadvantages compared with task-based functional magnetic resonance imaging, the limitations of resting-state functional magnetic resonance imaging, and the emerging directions of this relatively new technology.
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Affiliation(s)
- Stefan Lang
- *Department of Neurosurgery, University of Calgary, Calgary, Alberta, Canada; ‡Mind, Brain Imaging, and Neuroethics Unit, Institute of Mental Health Research, University of Ottawa, Ottawa, Ontario, Canada; §Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, China
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626
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Abstract
In recent years, some substantial advances in understanding human (and nonhuman) brain organization have emerged from a relatively unusual approach: the observation of spontaneous activity, and correlated patterns in spontaneous activity, in the "resting" brain. Most commonly, spontaneous neural activity is measured indirectly via fMRI signal in subjects who are lying quietly in the scanner, the so-called "resting state." This Primer introduces the fMRI-based study of spontaneous brain activity, some of the methodological issues active in the field, and some ways in which resting-state fMRI has been used to delineate aspects of area-level and supra-areal brain organization.
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Affiliation(s)
- Jonathan D Power
- Department of Neurology, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA.
| | - Bradley L Schlaggar
- Department of Neurology, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA; Department of Radiology, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA; Department of Pediatrics, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA; Department of Anatomy & Neurobiology, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA
| | - Steven E Petersen
- Department of Neurology, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA; Department of Radiology, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA; Department of Anatomy & Neurobiology, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA; Department of Psychology, Washington University in Saint Louis, One Brookings Drive, St. Louis, MO 63130, USA; Department of Neurosurgery, Washington University School of Medicine in St. Louis, 660 S. Euclid Avenue, St. Louis, MO 63110, USA; Department of Biomedical Engineering, Washington University in Saint Louis, One Brookings Drive, St. Louis, MO 63130, USA
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627
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Robinson ME, Lindemer ER, Fonda JR, Milberg WP, McGlinchey RE, Salat DH. Close-range blast exposure is associated with altered functional connectivity in Veterans independent of concussion symptoms at time of exposure. Hum Brain Mapp 2014; 36:911-22. [PMID: 25366378 DOI: 10.1002/hbm.22675] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 09/22/2014] [Accepted: 10/21/2014] [Indexed: 12/14/2022] Open
Abstract
Although there is emerging data on the effects of blast-related concussion (or mTBI) on cognition, the effects of blast exposure itself on the brain have only recently been explored. Toward this end, we examine functional connectivity to the posterior cingulate cortex, a primary region within the default mode network (DMN), in a cohort of 134 Iraq and Afghanistan Veterans characterized for a range of common military-associated comorbidities. Exposure to a blast at close range (<10 meters) was associated with decreased connectivity of bilateral primary somatosensory and motor cortices, and these changes were not different from those seen in participants with blast-related mTBI. These results remained significant when clinical factors such as sleep quality, chronic pain, or post traumatic stress disorder were included in the statistical model. In contrast, differences in functional connectivity based on concussion history and blast exposures at greater distances were not apparent. Despite the limitations of a study of this nature (e.g., assessments long removed from injury, self-reported blast history), these data demonstrate that blast exposure per se, which is prevalent among those who served in Iraq and Afghanistan, may be an important consideration in Veterans' health. It further offers a clinical guideline for determining which blasts (namely, those within 10 meters) are likely to lead to long-term health concerns and may be more accurate than using concussion symptoms alone.
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Affiliation(s)
- Meghan E Robinson
- Neuroimaging Research for Veterans Center (NeRVe), VA Boston Healthcare System, Boston, Massachusetts; Translational Research Center for TBI and Stress Disorders (TRACTS), VA Boston Healthcare System, Boston, Massachusetts
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628
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YorkWilliams S, Poston KL. What light have resting state fMRI studies shed on cognition and mood in Parkinson's disease? JOURNAL OF CLINICAL MOVEMENT DISORDERS 2014; 1:4. [PMID: 26788330 PMCID: PMC4677732 DOI: 10.1186/2054-7072-1-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 08/11/2014] [Indexed: 12/02/2022]
Abstract
Much remains unknown about non-motor symptoms of Parkinson’s disease (PD), which have variable occurrence, progression, and severity among patients. The existing suite of neuroimaging tools has yielded insight that cannot be garnered by traditional methods such as behavioral and post-mortem assessment. They provide information on brain activity and structure that is invaluable to understanding abnormalities associated with neurodegeneration in PD. Among these tools, functional magnetic resonance imaging (fMRI) is often favored for its safety and spatial resolution. Resting state fMRI research capitalizes on the wealth of information that the brain offers when a person is not performing a motor or cognitive task. It is also a good means to study impaired and heterogeneous populations, such as people with PD. The present article reviews research that applies resting state fMRI to the ongoing hunt for biomarkers of PD non-motor symptoms. Thus far, research in this subfield has focused on two of the most common and significant non-motor symptoms: cognitive impairment and depression. These studies support resting state fMRI as a valid and practical tool for the study of these symptoms, but discrepancies among findings highlight the importance of further research with standardized procedures.
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Affiliation(s)
- Sophie YorkWilliams
- Department of Neurology and Neurological Sciences, Stanford University, 300 Pasteur Drive, Stanford, CA 94305 USA
| | - Kathleen L Poston
- Department of Neurology and Neurological Sciences, Stanford University, 300 Pasteur Drive, Stanford, CA 94305 USA ; Department of Neurosurgery, Stanford University, 300 Pasteur Drive, Stanford, CA 94305 USA ; Stanford Neuroscience Institute, 300 Pasteur Drive, Stanford, CA 94305 USA
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629
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Whitson HE, Chou YH, Potter GG, Diaz MT, Chen NK, Lad EM, Johnson MA, Cousins SW, Zhuang J, Madden DJ. Phonemic fluency and brain connectivity in age-related macular degeneration: a pilot study. Brain Connect 2014; 5:126-35. [PMID: 25313954 DOI: 10.1089/brain.2014.0277] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Age-related macular degeneration (AMD), the leading cause of blindness in developed nations, has been associated with poor performance on tests of phonemic fluency. This pilot study sought to (1) characterize the relationship between phonemic fluency and resting-state functional brain connectivity in AMD patients and (2) determine whether regional connections associated with phonemic fluency in AMD patients were similarly linked to phonemic fluency in healthy participants. Behavior-based connectivity analysis was applied to resting-state, functional magnetic resonance imaging data from seven patients (mean age=79.9±7.5 years) with bilateral AMD who completed fluency tasks prior to imaging. Phonemic fluency was inversely related to the strength of functional connectivity (FC) among six pairs of brain regions, representing eight nodes: left opercular portion of inferior frontal gyrus (which includes Broca's area), left superior temporal gyrus (which includes part of Wernicke's area), inferior parietal lobe (bilaterally), right superior parietal lobe, right supramarginal gyrus, right supplementary motor area, and right precentral gyrus. The FC of these reference links was not related to phonemic fluency among 32 healthy individuals (16 younger adults, mean age=23.5±4.6 years and 16 older adults, mean age=68.3±3.4 years). Compared with healthy individuals, AMD patients exhibited higher mean connectivity within the reference links and within the default mode network, possibly reflecting compensatory changes to support performance in the setting of reduced vision. These findings are consistent with the hypothesis that phonemic fluency deficits in AMD reflect underlying brain changes that develop in the context of AMD.
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Affiliation(s)
- Heather E Whitson
- 1 Department of Medicine, Duke University Medical Center , Durham, North Carolina
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630
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Zhu H, Zhang J, Zhan W, Qiu C, Wu R, Meng Y, Cui H, Huang X, Li T, Gong Q, Zhang W. Altered spontaneous neuronal activity of visual cortex and medial anterior cingulate cortex in treatment-naïve posttraumatic stress disorder. Compr Psychiatry 2014; 55:1688-95. [PMID: 25060989 DOI: 10.1016/j.comppsych.2014.06.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Revised: 06/19/2014] [Accepted: 06/23/2014] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Although no more traumatic stimuli exists, a variety of symptoms are persisting in chronic Posttraumatic Stress Disorder (PTSD) patients. It is therefore necessary to explore the spontaneous brain activity of treatment-naïve PTSD patients during resting-state. METHOD Seventeen treatment-naïve PTSD patients and twenty traumatized controls were recruited and underwent a resting functional magnetic resonance imaging (Rs-fMRI) scan. The differences of regional brain spontaneous activity between the participants with and without PTSD were measured by Amplitude of Low-frequency fluctuation (ALFF). The relationship between the altered brain measurements and the symptoms of PTSD were analyzed. RESULT Compared to traumatized controls, the PTSD group showed significantly altered ALFF in many emotion-related brain regions, such as the medial anterior cingulate cortex (MACC), dorsolateral prefrontal cortex (DLPFC), insular (IC), middle temporal gyrus (MTG), and ventral posterior cingulate cortex (VPCC). Interestingly this is the first report of a hyperactive visual cortex (V1/V2) during resting-state in treatment-naïve PTSD patients. There were significant positive correlations between ALFF values in the bilateral visual cortex and re-experiencing or avoidance in PTSD. Negative correlation was observed between ALFF values in MACC and avoidance. CONCLUSION This study suggested that the visual cortex and the MACC may be involved in the characteristic symptoms of chronic PTSD, such as re-experiencing and avoidance. Future studies that focus on these areas of the brain are required, as alteration of these areas may act as a biomarker and could be targeted in future treatments for PTSD.
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Affiliation(s)
- Hongru Zhu
- Mental Health Center, West China Hospital of Sichuan University, Chengdu 610041, China; State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China
| | - Junran Zhang
- School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, Sichuan Province, China
| | - Wang Zhan
- Neuroimaging Center, University of Maryland, College Park 20740, MD, USA
| | - Changjian Qiu
- Mental Health Center, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Ruizhi Wu
- Mental Health Center, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Yajing Meng
- Mental Health Center, West China Hospital of Sichuan University, Chengdu 610041, China; State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China
| | - Haofei Cui
- Mental Health Center, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Xiaoqi Huang
- Huaxi MR Research Center (HMRRC), Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China
| | - Tao Li
- Mental Health Center, West China Hospital of Sichuan University, Chengdu 610041, China; State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China
| | - Qiyong Gong
- Huaxi MR Research Center (HMRRC), Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, China.
| | - Wei Zhang
- Mental Health Center, West China Hospital of Sichuan University, Chengdu 610041, China.
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631
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Scheinost D, Stoica T, Wasylink S, Gruner P, Saksa J, Pittenger C, Hampson M. Resting state functional connectivity predicts neurofeedback response. Front Behav Neurosci 2014; 8:338. [PMID: 25309375 PMCID: PMC4173810 DOI: 10.3389/fnbeh.2014.00338] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 09/08/2014] [Indexed: 12/21/2022] Open
Abstract
Tailoring treatments to the specific needs and biology of individual patients—personalized medicine—requires delineation of reliable predictors of response. Unfortunately, these have been slow to emerge, especially in neuropsychiatric disorders. We have recently described a real-time functional magnetic resonance imaging (rt-fMRI) neurofeedback protocol that can reduce contamination-related anxiety, a prominent symptom of many cases of obsessive-compulsive disorder (OCD). Individual response to this intervention is variable. Here we used patterns of brain functional connectivity, as measured by baseline resting-state fMRI (rs-fMRI), to predict improvements in contamination anxiety after neurofeedback training. Activity of a region of the orbitofrontal cortex (OFC) and anterior prefrontal cortex, Brodmann area (BA) 10, associated with contamination anxiety in each subject was measured in real time and presented as a neurofeedback signal, permitting subjects to learn to modulate this target brain region. We have previously reported both enhanced OFC/BA 10 control and improved anxiety in a group of subclinically anxious subjects after neurofeedback. Five individuals with contamination-related OCD who underwent the same protocol also showed improved clinical symptomatology. In both groups, these behavioral improvements were strongly correlated with baseline whole-brain connectivity in the OFC/BA 10, computed from rs-fMRI collected several days prior to neurofeedback training. These pilot data suggest that rs-fMRI can be used to identify individuals likely to benefit from rt-fMRI neurofeedback training to control contamination anxiety.
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Affiliation(s)
- Dustin Scheinost
- Magnetic Resonance Research Center (MRRC), Department of Diagnostic Radiology, Yale School of Medicine New Haven, CT, USA
| | - Teodora Stoica
- Magnetic Resonance Research Center (MRRC), Department of Diagnostic Radiology, Yale School of Medicine New Haven, CT, USA
| | - Suzanne Wasylink
- Department of Psychiatry, Yale School of Medicine New Haven, CT, USA
| | - Patricia Gruner
- Department of Psychiatry, Yale School of Medicine New Haven, CT, USA
| | - John Saksa
- Department of Psychiatry, Yale School of Medicine New Haven, CT, USA
| | - Christopher Pittenger
- Department of Psychiatry, Yale School of Medicine New Haven, CT, USA ; Department of Psychology, Yale University New Haven, CT, USA ; Child Study Center, Yale School of Medicine New Haven, CT, USA
| | - Michelle Hampson
- Magnetic Resonance Research Center (MRRC), Department of Diagnostic Radiology, Yale School of Medicine New Haven, CT, USA
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632
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Wu J, Qian Z, Tao L, Yin J, Ding S, Zhang Y, Yu Z. Resting state fMRI feature-based cerebral glioma grading by support vector machine. Int J Comput Assist Radiol Surg 2014; 10:1167-74. [PMID: 25227532 DOI: 10.1007/s11548-014-1111-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 08/22/2014] [Indexed: 10/24/2022]
Abstract
PURPOSE : Tumor grading plays an essential role in the optimal selection of solid tumor treatment. Noninvasive methods are needed for clinical grading of tumors. This study aimed to extract parameters of resting state blood oxygenation level-dependent functional magnetic resonance imaging (RS-fMRI) in the region of glioma and use the extracted features for tumor grading. METHODS : Tumor segmentation was performed with both conventional MRI and RS-fMRI. Four typical parameters, signal intensity difference ratio, signal intensity correlation (SIC), fractional amplitude of low-frequency fluctuation (fALFF) and regional homogeneity (ReHo), were defined to analyze tumor regions. Mann-Whitney [Formula: see text] test was employed to identify statistical difference of these four parameters between low-grade glioma (LGG) and high-grade glioma (HGG), respectively. Support vector machine (SVM) was employed to assess the diagnostic contributions of these parameters. RESULTS : Compared with LGG, HGG had more complex anatomical morphology and BOLD-fMRI features in the tumor region. SIC [Formula: see text], fALFF ([Formula: see text]) and ReHo ([Formula: see text]) were selected as features for classification according to the test [Formula: see text] value. The accuracy, sensitivity and specificity of SVM classification were better than 80, where SIC had the best classification accuracy (89). CONCLUSION : Parameters of RS-fMRI are effective to classify the tumor grade in glioma cases. The results indicate that this technique has clinical potential to serve as a complementary diagnostic tool.
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Affiliation(s)
- Jiangfen Wu
- Department of Biomedical Engineering, College of Automation, Nanjing University of Aeronautics and Astronautics, No. 29, Yudao St., Qinhuai District, Nanjing, 210016, Jiangsu Province, China,
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633
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Chi FL, Lang TC, Sun SJ, Tang XJ, Xu SY, Zheng HB, Zhao HS. Relationship between different surgical methods, hemorrhage position, hemorrhage volume, surgical timing, and treatment outcome of hypertensive intracerebral hemorrhage. World J Emerg Med 2014; 5:203-8. [PMID: 25225585 DOI: 10.5847/wjem.j.issn.1920-8642.2014.03.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 07/19/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The present study aimed to explore the relationship between surgical methods, hemorrhage position, hemorrhage volume, surgical timing and treatment outcome of hypertensive intracerebral hemorrhage (HICH). METHODS A total of 1 310 patients, who had been admitted to six hospitals from January 2004 to January 2008, were divided into six groups according to different surgical methods: craniotomy through bone flap (group A), craniotomy through a small bone window (group B), stereotactic drilling drainage (group C1 and group C2), neuron-endoscopy operation (group D) and external ventricular drainage (group E) in consideration of hemorrhage position, hemorrhage volume and clinical practice. A retrospective analysis was made of surgical timing and curative effect of the surgical methods. RESULTS The effectiveness rate of the methods was 74.12% for 1 310 patients after one-month follow-up. In this series, the disability rate was 44.82% 3-6 months after the operation. Among the 1 310 patients, 241 (18.40%) patients died after the operation. If hematoma volume was >80 mL and the operation was performed within 3 hours, the mortality rate of group A was significantly lower than that of groups B, C, D, and E (P<0.05). If hematoma volume was 50-80 mL and the operation was performed within 6-12 hours, the mortality rate of groups B and D was lower than that of groups A, C and E (P<0.05). If hematoma volume was 20-50 mL and the operation was performed within 6-24 hours, the mortality rate of group C was lower than that of groups A, B and D (P<0.05). CONCLUSIONS Craniotomy through a bone flap is suitable for patients with a large hematoma and hernia of the brain. Stereotactic drilling drainage is suggested for patients with hematoma volume less than 80 mL. The curative effect of HICH individualized treatment would be improved via the suitable selection of operation time and surgical method according to the position and volume of hemorrhage.
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Affiliation(s)
- Feng-Ling Chi
- Department of Neurosurgery, Shanghai 7th Hospital, Shanghai 200137, China
| | - Tie-Cheng Lang
- Yueyang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China
| | - Shu-Jie Sun
- Emergency Medicine Department, Dongfang Hospital of Shanghai, Shanghai, China
| | - Xue-Jie Tang
- Second Hospltal of Dalian Medical University, Dlian, China
| | - Shu-Yuan Xu
- Shanghai Pudong New Area Gongli Hospital, Shanghai, China
| | - Hong-Bo Zheng
- First People's Hospital of Qiqihaer City, Heilongjiang Province, China
| | - Hui-Song Zhao
- Third Affiliated Hospital, Qiqihar Medical College, Heilongjiang Province, China
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634
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Sundermann B, Olde lütke Beverborg M, Pfleiderer B. Toward literature-based feature selection for diagnostic classification: a meta-analysis of resting-state fMRI in depression. Front Hum Neurosci 2014; 8:692. [PMID: 25309382 PMCID: PMC4159995 DOI: 10.3389/fnhum.2014.00692] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 08/19/2014] [Indexed: 12/11/2022] Open
Abstract
Information derived from functional magnetic resonance imaging (fMRI) during wakeful rest has been introduced as a candidate diagnostic biomarker in unipolar major depressive disorder (MDD). Multiple reports of resting state fMRI in MDD describe group effects. Such prior knowledge can be adopted to pre-select potentially discriminating features for diagnostic classification models with the aim to improve diagnostic accuracy. Purpose of this analysis was to consolidate spatial information about alterations of spontaneous brain activity in MDD, primarily to serve as feature selection for multivariate pattern analysis techniques (MVPA). Thirty two studies were included in final analyses. Coordinates extracted from the original reports were assigned to two categories based on directionality of findings. Meta-analyses were calculated using the non-additive activation likelihood estimation approach with coordinates organized by subject group to account for non-independent samples. Converging evidence revealed a distributed pattern of brain regions with increased or decreased spontaneous activity in MDD. The most distinct finding was hyperactivity/hyperconnectivity presumably reflecting the interaction of cortical midline structures (posterior default mode network components including the precuneus and neighboring posterior cingulate cortices associated with self-referential processing and the subgenual anterior cingulate and neighboring medial frontal cortices) with lateral prefrontal areas related to externally-directed cognition. Other areas of hyperactivity/hyperconnectivity include the left lateral parietal cortex, right hippocampus and right cerebellum whereas hypoactivity/hypoconnectivity was observed mainly in the left temporal cortex, the insula, precuneus, superior frontal gyrus, lentiform nucleus and thalamus. Results are made available in two different data formats to be used as spatial hypotheses in future studies, particularly for diagnostic classification by MVPA.
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Affiliation(s)
- Benedikt Sundermann
- Department of Clinical Radiology, University Hospital MünsterMünster, Germany
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635
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Resting-state blood oxygen level-dependent functional magnetic resonance imaging for presurgical planning. Neuroimaging Clin N Am 2014; 24:655-69. [PMID: 25441506 DOI: 10.1016/j.nic.2014.07.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Resting-state functional MR imaging (rsfMR imaging) measures spontaneous fluctuations in the blood oxygen level-dependent (BOLD) signal and can be used to elucidate the brain's functional organization. It is used to simultaneously assess multiple distributed resting-state networks. Unlike task-based functional MR imaging, rsfMR imaging does not require task performance. This article presents a brief introduction of rsfMR imaging processing methods followed by a detailed discussion on the use of rsfMR imaging in presurgical planning. Example cases are provided to highlight the strengths and limitations of the technique.
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636
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Wiest R, Abela E, Missimer J, Schroth G, Hess CW, Sturzenegger M, Wang DJJ, Weder B, Federspiel A. Interhemispheric cerebral blood flow balance during recovery of motor hand function after ischemic stroke--a longitudinal MRI study using arterial spin labeling perfusion. PLoS One 2014; 9:e106327. [PMID: 25191858 PMCID: PMC4156327 DOI: 10.1371/journal.pone.0106327] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Accepted: 07/30/2014] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Unilateral ischemic stroke disrupts the well balanced interactions within bilateral cortical networks. Restitution of interhemispheric balance is thought to contribute to post-stroke recovery. Longitudinal measurements of cerebral blood flow (CBF) changes might act as surrogate marker for this process. OBJECTIVE To quantify longitudinal CBF changes using arterial spin labeling MRI (ASL) and interhemispheric balance within the cortical sensorimotor network and to assess their relationship with motor hand function recovery. METHODS Longitudinal CBF data were acquired in 23 patients at 3 and 9 months after cortical sensorimotor stroke and in 20 healthy controls using pulsed ASL. Recovery of grip force and manual dexterity was assessed with tasks requiring power and precision grips. Voxel-based analysis was performed to identify areas of significant CBF change. Region-of-interest analyses were used to quantify the interhemispheric balance across nodes of the cortical sensorimotor network. RESULTS Dexterity was more affected, and recovered at a slower pace than grip force. In patients with successful recovery of dexterous hand function, CBF decreased over time in the contralesional supplementary motor area, paralimbic anterior cingulate cortex and superior precuneus, and interhemispheric balance returned to healthy control levels. In contrast, patients with poor recovery presented with sustained hypoperfusion in the sensorimotor cortices encompassing the ischemic tissue, and CBF remained lateralized to the contralesional hemisphere. CONCLUSIONS Sustained perfusion imbalance within the cortical sensorimotor network, as measured with task-unrelated ASL, is associated with poor recovery of dexterous hand function after stroke. CBF at rest might be used to monitor recovery and gain prognostic information.
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Affiliation(s)
- Roland Wiest
- Support Center for Advanced Neuroimaging (SCAN), Institute for Diagnostic and Interventional Neuroradiology, University Hospital Inselspital and University of Bern, Bern, Switzerland
- * E-mail:
| | - Eugenio Abela
- Support Center for Advanced Neuroimaging (SCAN), Institute for Diagnostic and Interventional Neuroradiology, University Hospital Inselspital and University of Bern, Bern, Switzerland
- Department of Neurology, University Hospital Inselspital and University of Bern, Bern, Switzerland
| | - John Missimer
- Paul Scherrer Institute, Laboratory of Biomolecular Research, Villigen, Switzerland
| | - Gerhard Schroth
- Support Center for Advanced Neuroimaging (SCAN), Institute for Diagnostic and Interventional Neuroradiology, University Hospital Inselspital and University of Bern, Bern, Switzerland
| | - Christian W. Hess
- Department of Neurology, University Hospital Inselspital and University of Bern, Bern, Switzerland
| | - Matthias Sturzenegger
- Department of Neurology, University Hospital Inselspital and University of Bern, Bern, Switzerland
| | - Danny J. J. Wang
- Department of Neurology, Ahmanson-Lovelace Brain Mapping Center, University of California Los Angeles, Los Angeles, California, United States of America
| | - Bruno Weder
- Support Center for Advanced Neuroimaging (SCAN), Institute for Diagnostic and Interventional Neuroradiology, University Hospital Inselspital and University of Bern, Bern, Switzerland
- Department of Neurology, Kantonsspital St. Gallen, St. Gallen, Switzerland
- Department of Neurology, University Hospital Inselspital and University of Bern, Bern, Switzerland
| | - Andrea Federspiel
- Department of Psychiatric Neurophysiology, University Hospital of Psychiatry and University of Bern, Bern, Switzerland
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637
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Zhang LJ, Wu S, Ren J, Lu GM. Resting-state functional magnetic resonance imaging in hepatic encephalopathy: current status and perspectives. Metab Brain Dis 2014; 29:569-82. [PMID: 24562590 DOI: 10.1007/s11011-014-9504-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 02/06/2014] [Indexed: 02/06/2023]
Abstract
Hepatic encephalopathy (HE) is a neuropsychiatric syndrome which develops in patients with severe liver diseases and/or portal-systemic shunting. Minimal HE, the earliest manifestation of HE, has drawn increasing attention in the last decade. Minimal HE is associated with a series of brain functional changes, such as attention, working memory, and so on. Blood oxygen level dependent (BOLD) functional MRI (fMRI), especially resting-state fMRI has been used to explore the brain functional changes of HE, yielding important insights for understanding pathophysiological mechanisms and functional reorganization of HE. This paper briefly reviews the principles of BOLD fMRI, potential applications of resting-state fMRI with advanced post-processing algorithms such as regional homogeneity, amplitude of low frequency fluctuation, functional connectivity and future research perspective in this field.
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Affiliation(s)
- Long Jiang Zhang
- Department of Medical Imaging, Jinling Hospital, Medical School of Nanjing University, 305 Zhongshan East Road, Xuanwu District, Nangjing, Jiangsu Province, China, 210002,
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638
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Schultz AP, Chhatwal JP, Huijbers W, Hedden T, van Dijk KRA, McLaren DG, Ward AM, Wigman S, Sperling RA. Template based rotation: a method for functional connectivity analysis with a priori templates. Neuroimage 2014; 102 Pt 2:620-36. [PMID: 25150630 DOI: 10.1016/j.neuroimage.2014.08.022] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Accepted: 08/11/2014] [Indexed: 11/18/2022] Open
Abstract
Functional connectivity magnetic resonance imaging (fcMRI) is a powerful tool for understanding the network level organization of the brain in research settings and is increasingly being used to study large-scale neuronal network degeneration in clinical trial settings. Presently, a variety of techniques, including seed-based correlation analysis and group independent components analysis (with either dual regression or back projection) are commonly employed to compute functional connectivity metrics. In the present report, we introduce template based rotation,(1) a novel analytic approach optimized for use with a priori network parcellations, which may be particularly useful in clinical trial settings. Template based rotation was designed to leverage the stable spatial patterns of intrinsic connectivity derived from out-of-sample datasets by mapping data from novel sessions onto the previously defined a priori templates. We first demonstrate the feasibility of using previously defined a priori templates in connectivity analyses, and then compare the performance of template based rotation to seed based and dual regression methods by applying these analytic approaches to an fMRI dataset of normal young and elderly subjects. We observed that template based rotation and dual regression are approximately equivalent in detecting fcMRI differences between young and old subjects, demonstrating similar effect sizes for group differences and similar reliability metrics across 12 cortical networks. Both template based rotation and dual-regression demonstrated larger effect sizes and comparable reliabilities as compared to seed based correlation analysis, though all three methods yielded similar patterns of network differences. When performing inter-network and sub-network connectivity analyses, we observed that template based rotation offered greater flexibility, larger group differences, and more stable connectivity estimates as compared to dual regression and seed based analyses. This flexibility owes to the reduced spatial and temporal orthogonality constraints of template based rotation as compared to dual regression. These results suggest that template based rotation can provide a useful alternative to existing fcMRI analytic methods, particularly in clinical trial settings where predefined outcome measures and conserved network descriptions across groups are at a premium.
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Affiliation(s)
- Aaron P Schultz
- Harvard Aging Brain Study, Massachusetts Alzheimer's Disease Research Center, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, 02129 USA.
| | - Jasmeer P Chhatwal
- Harvard Aging Brain Study, Massachusetts Alzheimer's Disease Research Center, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA; Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women's Hospital, Boston, MA 02115, USA; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, 02129 USA
| | - Willem Huijbers
- Harvard Aging Brain Study, Massachusetts Alzheimer's Disease Research Center, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA; Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women's Hospital, Boston, MA 02115, USA; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, 02129 USA
| | - Trey Hedden
- Harvard Aging Brain Study, Massachusetts Alzheimer's Disease Research Center, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, 02129 USA; Department of Radiology, Massachusetts General Hospital, Boston, MA, USA
| | - Koene R A van Dijk
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, 02129 USA; Harvard University, Department of Psychology, Center for Brain Science, Cambridge, MA, 02138 USA
| | - Donald G McLaren
- Harvard Aging Brain Study, Massachusetts Alzheimer's Disease Research Center, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, 02129 USA
| | - Andrew M Ward
- Harvard Aging Brain Study, Massachusetts Alzheimer's Disease Research Center, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA; Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women's Hospital, Boston, MA 02115, USA; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, 02129 USA
| | - Sarah Wigman
- Harvard Aging Brain Study, Massachusetts Alzheimer's Disease Research Center, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA; Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women's Hospital, Boston, MA 02115, USA
| | - Reisa A Sperling
- Harvard Aging Brain Study, Massachusetts Alzheimer's Disease Research Center, Department of Neurology, Massachusetts General Hospital, Boston, MA 02114, USA; Center for Alzheimer Research and Treatment, Department of Neurology, Brigham and Women's Hospital, Boston, MA 02115, USA; Harvard Medical School, Boston, MA 02115, USA
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639
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Romero K, Black SE, Feinstein A. Differences in cerebral perfusion deficits in mild traumatic brain injury and depression using single-photon emission computed tomography. Front Neurol 2014; 5:158. [PMID: 25191305 PMCID: PMC4138441 DOI: 10.3389/fneur.2014.00158] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Accepted: 08/05/2014] [Indexed: 12/04/2022] Open
Abstract
Background: Numerous studies have shown decreased perfusion in the prefrontal cortex following mild traumatic brain injury (mTBI). However, similar hypoperfusion can also be observed in depression. Given the high prevalence of depressive symptoms following mTBI, it is unclear to what extent depression influences hypoperfusion in TBI. Methods: Mild TBI patients without depressive symptoms (mTBI-noD, n = 39), TBI patients with depressive symptoms (mTBI-D, n = 13), and 15 patients with major depressive disorder (MDD), but no TBI were given 99m T-ECD single-photon emission computed tomography (SPECT) scans within 2 weeks of injury. All subjects completed tests of information processing speed, complex attention, and executive functioning, and a self-report questionnaire measuring symptoms of psychological distress. Between-group comparisons of quantified SPECT perfusion were undertaken using univariate and multivariate (partial least squares) analyses. Results: mTBI-D and mTBI-noD groups did not differ in terms of cerebral perfusion. However, patients with MDD showed hypoperfusion compared to both TBI groups in several frontal (orbitofrontal, middle frontal, and superior frontal cortex), superior temporal, and posterior cingulate regions. The mTBI-D group showed poorer performance on a measure of complex attention and working memory compared to both the mTBI-noD and MDD groups. Conclusion: These results suggest that depressive symptoms do not affect SPECT perfusion in the sub-acute phase following a mild TBI. Conversely, MDD is associated with hypoperfusion primarily in frontal regions.
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Affiliation(s)
- Kristoffer Romero
- Department of Psychiatry, Sunnybrook Health Sciences Centre , Toronto, ON , Canada
| | - Sandra E Black
- Heart and Stroke Foundation Centre for Stroke Recovery, Sunnybrook Health Sciences Centre , Toronto, ON , Canada ; L. C. Campbell Cognitive Neurology Research Unit, Sunnybrook Health Sciences Centre , Toronto, ON , Canada
| | - Anthony Feinstein
- Department of Psychiatry, Sunnybrook Health Sciences Centre , Toronto, ON , Canada
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640
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Becerra L, Sava S, Simons LE, Drosos AM, Sethna N, Berde C, Lebel AA, Borsook D. Intrinsic brain networks normalize with treatment in pediatric complex regional pain syndrome. Neuroimage Clin 2014; 6:347-69. [PMID: 25379449 PMCID: PMC4218937 DOI: 10.1016/j.nicl.2014.07.012] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 07/17/2014] [Accepted: 07/29/2014] [Indexed: 12/22/2022]
Abstract
Pediatric complex regional pain syndrome (P-CRPS) offers a unique model of chronic neuropathic pain as it either resolves spontaneously or through therapeutic interventions in most patients. Here we evaluated brain changes in well-characterized children and adolescents with P-CRPS by measuring resting state networks before and following a brief (median = 3 weeks) but intensive physical and psychological treatment program, and compared them to matched healthy controls. Differences in intrinsic brain networks were observed in P-CRPS compared to controls before treatment (disease state) with the most prominent differences in the fronto-parietal, salience, default mode, central executive, and sensorimotor networks. Following treatment, behavioral measures demonstrated a reduction of symptoms and improvement of physical state (pain levels and motor functioning). Correlation of network connectivities with spontaneous pain measures pre- and post-treatment indicated concomitant reductions in connectivity in salience, central executive, default mode and sensorimotor networks (treatment effects). These results suggest a rapid alteration in global brain networks with treatment and provide a venue to assess brain changes in CRPS pre- and post-treatment, and to evaluate therapeutic effects.
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Affiliation(s)
- Lino Becerra
- Pain/Analgesia Imaging Neuroscience (P.A.I.N.) Group, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA ; Department of Anesthesiology, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA ; Department of Radiology, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
| | - Simona Sava
- Pain/Analgesia Imaging Neuroscience (P.A.I.N.) Group, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
| | - Laura E Simons
- Pain/Analgesia Imaging Neuroscience (P.A.I.N.) Group, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA ; Department of Anesthesiology, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
| | - Athena M Drosos
- Pain/Analgesia Imaging Neuroscience (P.A.I.N.) Group, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
| | - Navil Sethna
- Department of Anesthesiology, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
| | - Charles Berde
- Department of Anesthesiology, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
| | - Alyssa A Lebel
- Pain/Analgesia Imaging Neuroscience (P.A.I.N.) Group, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA ; Department of Anesthesiology, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
| | - David Borsook
- Pain/Analgesia Imaging Neuroscience (P.A.I.N.) Group, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA ; Department of Anesthesiology, Boston Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
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641
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Huf W, Kalcher K, Boubela RN, Rath G, Vecsei A, Filzmoser P, Moser E. On the generalizability of resting-state fMRI machine learning classifiers. Front Hum Neurosci 2014; 8:502. [PMID: 25120443 PMCID: PMC4114329 DOI: 10.3389/fnhum.2014.00502] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 06/20/2014] [Indexed: 12/13/2022] Open
Abstract
Machine learning classifiers have become increasingly popular tools to generate single-subject inferences from fMRI data. With this transition from the traditional group level difference investigations to single-subject inference, the application of machine learning methods can be seen as a considerable step forward. Existing studies, however, have given scarce or no information on the generalizability to other subject samples, limiting the use of such published classifiers in other research projects. We conducted a simulation study using publicly available resting-state fMRI data from the 1000 Functional Connectomes and COBRE projects to examine the generalizability of classifiers based on regional homogeneity of resting-state time series. While classification accuracies of up to 0.8 (using sex as the target variable) could be achieved on test datasets drawn from the same study as the training dataset, the generalizability of classifiers to different study samples proved to be limited albeit above chance. This shows that on the one hand a certain amount of generalizability can robustly be expected, but on the other hand this generalizability should not be overestimated. Indeed, this study substantiates the need to include data from several sites in a study investigating machine learning classifiers with the aim of generalizability.
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Affiliation(s)
- Wolfgang Huf
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna Vienna, Austria ; MR Centre of Excellence, Medical University of Vienna Vienna, Austria ; Department of Statistics and Probability Theory, Vienna University of Technology Vienna, Austria
| | - Klaudius Kalcher
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna Vienna, Austria ; MR Centre of Excellence, Medical University of Vienna Vienna, Austria ; Department of Statistics and Probability Theory, Vienna University of Technology Vienna, Austria
| | - Roland N Boubela
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna Vienna, Austria ; MR Centre of Excellence, Medical University of Vienna Vienna, Austria ; Department of Statistics and Probability Theory, Vienna University of Technology Vienna, Austria
| | - Georg Rath
- MR Centre of Excellence, Medical University of Vienna Vienna, Austria ; Department of Radiodiagnostics and Nuclear Medicine, Medical University of Vienna Vienna, Austria
| | - Andreas Vecsei
- Department of Pediatrics and Adolescent Medicine, St. Anna Children's Hospital, Medical University of Vienna Vienna, Austria
| | - Peter Filzmoser
- Department of Statistics and Probability Theory, Vienna University of Technology Vienna, Austria
| | - Ewald Moser
- Center for Medical Physics and Biomedical Engineering, Medical University of Vienna Vienna, Austria ; MR Centre of Excellence, Medical University of Vienna Vienna, Austria ; Department of Psychiatry, University of Pennsylvania Medical Center Philadelphia, PA, USA
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642
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Functional connectivity changes between parietal and prefrontal cortices in primary insomnia patients: evidence from resting-state fMRI. Eur J Med Res 2014; 19:32. [PMID: 24915847 PMCID: PMC4062281 DOI: 10.1186/2047-783x-19-32] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 05/15/2014] [Indexed: 12/05/2022] Open
Abstract
Background Primary insomnia can severely impair daytime function by disrupting attention and working memory and imposes a danger to self and others by increasing the risk of accidents. We speculated that the neurobiological changes impeding working memory in primary insomnia patients would be revealed by resting-state functional MRI (R-fMRI), which estimates the strength of cortical pathways by measuring local and regional correlations in blood oxygen level dependent (BOLD) signs independent of specific task demands. Methods We compared the R-fMRI activity patterns of 15 healthy controls to 15 primary insomnia patients (all 30 participants were right-handed) using a 3.0 T MRI scanner. The SPM8 and REST1.7 software packages were used for preprocessing and analysis. Activity was expressed relative to the superior parietal lobe (SPL, the seed region) to reveal differences in functional connectivity to other cortical regions implicated in spatial working memory. Result In healthy controls, bilateral SPL activity was associated with activity in the posterior cingulate gyrus, precuneus, ventromedial prefrontal cortex, and superior frontal gyrus, indicating functional connectivity between these regions. Strong functional connectivity between the SPL and bilateral pre-motor cortex, bilateral supplementary motor cortex, and left dorsolateral prefrontal cortex was observed in both the control group and the primary insomnia group. However, the strength of several other functional connectivity pathways to the SPL exhibited significant group differences. Compared to healthy controls, connectivity in the primary insomnia group was stronger between the bilateral SPL and the right ventral anterior cingulate cortex, left ventral posterior cingulate cortex, right splenium of the corpus callosum, right pars triangularis (right inferior frontal gyrus/Broca’s area), and right insular lobe, while connectivity was weaker between the SPL and right superior frontal gyrus (dorsolateral prefrontal cortex). Conclusion Primary insomnia appears to alter the functional connectivity between the parietal and frontal lobes, cortical structures critical for spatial and verbal working memory.
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643
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Rosazza C, Aquino D, D’Incerti L, Cordella R, Andronache A, Zacà D, Bruzzone MG, Tringali G, Minati L. Preoperative mapping of the sensorimotor cortex: comparative assessment of task-based and resting-state FMRI. PLoS One 2014; 9:e98860. [PMID: 24914775 PMCID: PMC4051640 DOI: 10.1371/journal.pone.0098860] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 05/08/2014] [Indexed: 11/18/2022] Open
Abstract
Resting state fMRI (rs-fMRI) has recently been considered as a possible complement or alternative to task-based fMRI (tb-fMRI) for presurgical mapping. However, evidence of its usefulness remains scant, because existing studies have investigated relatively small samples and focused primarily on qualitative evaluation. The aim of this study is to investigate the clinical usefulness of rs-fMRI in the context of presurgical mapping of motor functions, and in particular to determine the degree of correspondence with tb-fMRI which, while not a gold-standard, is commonly used in preoperative setting. A group of 13 patients with lesions close to the sensorimotor cortex underwent rs-fMRI and tb-fMRI to localize the hand, foot and mouth motor areas. We assessed quantitatively the degree of correspondence between multiple rs-fMRI analyses (independent-component and seed-based analyses) and tb-fMRI, with reference to sensitivity and specificity of rs-fMRI with respect to tb-fMRI, and centre-of-mass distances. Agreement with electro-cortical stimulation (ECS) was also investigated, and a traditional map thresholding approach based on agreement between two experienced operators was compared to an automatic threshold determination method. Rs-fMRI can localize the sensorimotor cortex successfully, providing anatomical specificity for hand, foot and mouth motor subregions, in particular with seed-based analyses. Agreement with tb-fMRI was only partial and rs-fMRI tended to provide larger patterns of correlated activity. With respect to the ECS data available, rs-fMRI and tb-fMRI performed comparably, even though the shortest distance to stimulation points was observed for the latter. Notably, the results of both were on the whole robust to thresholding procedure. Localization performed by rs-fMRI is not equivalent to tb-fMRI, hence rs-fMRI cannot be considered as an outright replacement for tb-fMRI. Nevertheless, since there is significant agreement between the two techniques, rs-fMRI can be considered with caution as a potential alternative to tb-fMRI when patients are unable to perform the task.
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Affiliation(s)
- Cristina Rosazza
- Neuroradiology Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
- Scientific Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
- * E-mail:
| | - Domenico Aquino
- Neuroradiology Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
| | - Ludovico D’Incerti
- Neuroradiology Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
| | - Roberto Cordella
- Neurosurgery Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
| | - Adrian Andronache
- Neuroradiology Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
| | - Domenico Zacà
- Center for Mind/Brain Sciences (CIMeC), University of Trento, Trento, Italy
| | - Maria Grazia Bruzzone
- Neuroradiology Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
| | - Giovanni Tringali
- Neurosurgery Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
| | - Ludovico Minati
- Scientific Department, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milano, Italy
- Center for Mind/Brain Sciences (CIMeC), University of Trento, Trento, Italy
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644
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Intrinsic functional connectivity networks in healthy elderly subjects: a multiparametric approach with structural connectivity analysis. BIOMED RESEARCH INTERNATIONAL 2014; 2014:947252. [PMID: 24971361 PMCID: PMC4058120 DOI: 10.1155/2014/947252] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 05/01/2014] [Accepted: 05/03/2014] [Indexed: 12/11/2022]
Abstract
Intrinsic functional connectivity magnetic resonance imaging (iFCMRI) provides an encouraging approach for mapping large-scale intrinsic connectivity networks (ICNs) in the “resting” brain. Structural connections as measured by diffusion tensor imaging (DTI) are a major constraint on the identified ICNs. This study aimed at the combined investigation of ten well-defined ICNs in healthy elderly subjects at single subject level as well as at the group level, together with the underlying structural connectivity. IFCMRI and DTI data were acquired in twelve subjects (68 ± 7 years) at a 3T scanner and were studied using the tensor imaging and fiber tracking software package. The seed-based iFCMRI analysis approach was comprehensively performed with DTI analysis, following standardized procedures including an 8-step processing of iFCMRI data. Our findings demonstrated robust ICNs at the single subject level and conclusive brain maps at the group level in the healthy elderly sample, supported by the complementary fiber tractography. The findings demonstrated here provide a methodological framework for future comparisons of pathological (e.g., neurodegenerative) conditions with healthy controls on the basis of multiparametric functional connectivity mapping.
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645
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Abstract
Evaluating language has been a long-standing application in functional magnetic resonance imaging (fMRI) studies, both in research and clinical circumstances, and still provides challenges. Localization of eloquent areas is important in neurosurgical cases, so that there is least possible damage to these areas during surgery, maintaining their function postoperatively, therefore providing good quality of life to the patient. Preoperative fMRI study is a non-invasive tool to localize the eloquent areas, including language, with other traditional methods generally used being invasive and at times perilous. In this article, we describe methods and various paradigms to study the language areas, in clinical neurosurgical cases, along with illustrations of cases from our institute.
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Affiliation(s)
- Santosh S Gupta
- Department of Magnetic Resonance Imaging, P.D. Hinduja Hospital and Medical Research Centre, Veer Savarkar Marg, Mahim, Mumbai, Maharashtra, India
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646
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Song X, Chen NK. A SVM-based quantitative fMRI method for resting-state functional network detection. Magn Reson Imaging 2014; 32:819-31. [PMID: 24928301 DOI: 10.1016/j.mri.2014.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 02/20/2014] [Accepted: 04/03/2014] [Indexed: 11/26/2022]
Abstract
Resting-state functional magnetic resonance imaging (fMRI) aims to measure baseline neuronal connectivity independent of specific functional tasks and to capture changes in the connectivity due to neurological diseases. Most existing network detection methods rely on a fixed threshold to identify functionally connected voxels under the resting state. Due to fMRI non-stationarity, the threshold cannot adapt to variation of data characteristics across sessions and subjects, and generates unreliable mapping results. In this study, a new method is presented for resting-state fMRI data analysis. Specifically, the resting-state network mapping is formulated as an outlier detection process that is implemented using one-class support vector machine (SVM). The results are refined by using a spatial-feature domain prototype selection method and two-class SVM reclassification. The final decision on each voxel is made by comparing its probabilities of functionally connected and unconnected instead of a threshold. Multiple features for resting-state analysis were extracted and examined using an SVM-based feature selection method, and the most representative features were identified. The proposed method was evaluated using synthetic and experimental fMRI data. A comparison study was also performed with independent component analysis (ICA) and correlation analysis. The experimental results show that the proposed method can provide comparable or better network detection performance than ICA and correlation analysis. The method is potentially applicable to various resting-state quantitative fMRI studies.
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Affiliation(s)
- Xiaomu Song
- Department of Electrical Engineering, School of Engineering, Widener University, Kirkbride Hall, Room 369, One University Place, Chester, PA 19013, USA.
| | - Nan-kuei Chen
- Brain Imaging and Analysis Center, Duke University Medical Center, Box 2737, Hock Plaza, Durham, NC 27710, USA
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647
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Gomez-Ramirez J, Wu J. Network-based biomarkers in Alzheimer's disease: review and future directions. Front Aging Neurosci 2014; 6:12. [PMID: 24550828 PMCID: PMC3912507 DOI: 10.3389/fnagi.2014.00012] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Accepted: 01/19/2014] [Indexed: 01/06/2023] Open
Abstract
By 2050 it is estimated that the number of worldwide Alzheimer's disease (AD) patients will quadruple from the current number of 36 million people. To date, no single test, prior to postmortem examination, can confirm that a person suffers from AD. Therefore, there is a strong need for accurate and sensitive tools for the early diagnoses of AD. The complex etiology and multiple pathogenesis of AD call for a system-level understanding of the currently available biomarkers and the study of new biomarkers via network-based modeling of heterogeneous data types. In this review, we summarize recent research on the study of AD as a connectivity syndrome. We argue that a network-based approach in biomarker discovery will provide key insights to fully understand the network degeneration hypothesis (disease starts in specific network areas and progressively spreads to connected areas of the initial loci-networks) with a potential impact for early diagnosis and disease-modifying treatments. We introduce a new framework for the quantitative study of biomarkers that can help shorten the transition between academic research and clinical diagnosis in AD.
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Affiliation(s)
- Jaime Gomez-Ramirez
- Autonomous Systems Laboratory, Universidad Politécnica de Madrid , Madrid , Spain ; Biomedical Engineering Laboratory, Okayama University , Okayama , Japan
| | - Jinglong Wu
- Biomedical Engineering Laboratory, Okayama University , Okayama , Japan
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648
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Abstract
OBJECTIVES To review neuroimaging research concerning cancer- and cancer treatment-related changes in brain structure and function, clinical perspectives, and future directions. DATA SOURCES Peer-reviewed literature. CONCLUSION Cancer and chemotherapy are associated with cerebral structural and functional alterations in breast cancer patients that may persist for years; many of these changes are correlated with cognitive complaints or performance. In other cancers there is some evidence that metabolism is altered by cancer, but more research is needed. IMPLICATIONS FOR NURSING PRACTICE Understanding the role of neuroimaging is important to identify the basis of cognitive changes associated with cancer and cancer treatment.
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Affiliation(s)
| | - Diane Von Ah
- Department of Adult Health, Indiana University School of Nursing, Indianapolis, IN
| | | | - Andrew J. Saykin
- Center for Neuroimaging, Indiana University School of Medicine, Indianapolis, IN
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649
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Gorges M, Müller HP, Lulé D, Ludolph AC, Pinkhardt EH, Kassubek J. Functional connectivity within the default mode network is associated with saccadic accuracy in Parkinson's disease: a resting-state FMRI and videooculographic study. Brain Connect 2013; 3:265-72. [PMID: 23627641 DOI: 10.1089/brain.2013.0146] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In addition to the skeleto-motor deficits, patients with Parkinson's disease (PD) frequently present with oculomotor dysfunctions such as impaired smooth pursuit and saccadic abnormalities. There is increasing evidence for an impaired cortical function to be responsible for oculomotor deficits that are associated with lack of inhibitory control; however, these pathomechanisms still remain poorly understood. By means of "task-free" resting-state functional magnetic resonance imaging (rs-fMRI), functional connectivity changes in PD within the default mode network (DMN) have been reported. The aim of this study was to investigate whether altered functional connectivity within the DMN was correlated with oculomotor parameter changes in PD. Twelve PD patients and 13 matched healthy controls underwent rs-fMRI at 1.5 T and videooculography (VOG) using Eye-Link-System. Rs-fMRI seed-based region-to-region connectivity analysis was performed, including medial prefrontal cortex (mPFC), medial temporal lobe (MTL), posterior cingulate cortex (PCC), and hippocampal formation (HF); while VOG examination comprised ocular reactive saccades, smooth pursuit, and executive tests. Rs-fMRI analysis demonstrated a decreased region-to-region functional connectivity between mPFC and PCC as well as increased connectivity between bilateral HF in PD compared with controls. In VOG, patients and controls differed in terms of executive tests outcome, smooth pursuit eye movement, and visually guided reactive saccades but not in peak eye velocity. A significant relationship was observed between saccadic accuracy and functional connectivity strengths between MTL and PCC. These results suggest that PD-associated changes of DMN connectivity are correlated with PD-associated saccadic hypometria, in particular in the vertical direction.
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Affiliation(s)
- Martin Gorges
- Department of Neurology, University of Ulm, Ulm, Germany
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650
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Hoff GEAJ, Van den Heuvel MP, Benders MJNL, Kersbergen KJ, De Vries LS. On development of functional brain connectivity in the young brain. Front Hum Neurosci 2013; 7:650. [PMID: 24115929 PMCID: PMC3792361 DOI: 10.3389/fnhum.2013.00650] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 09/18/2013] [Indexed: 12/28/2022] Open
Abstract
Our brain is a complex network of structurally and functionally interconnected regions, shaped to efficiently process and integrate information. The development from a brain equipped with basic functionalities to an efficient network facilitating complex behavior starts during gestation and continues into adulthood. Resting-state functional MRI (rs-fMRI) enables the examination of developmental aspects of functional connectivity (FC) and functional brain networks. This review will discuss changes observed in the developing brain on the level of network FC from a gestational age of 20 weeks onwards. We discuss findings of resting-state fMRI studies showing that functional network development starts during gestation, creating a foundation for each of the resting-state networks (RSNs) to be established. Visual and sensorimotor areas are reported to develop first, with other networks, at different rates, increasing both in network connectivity and size over time. Reaching childhood, marked fine-tuning and specialization takes place in the regions necessary for higher-order cognitive functions.
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Affiliation(s)
- G E Anna-Jasmijn Hoff
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht Utrecht, Netherlands
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