201
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Zimeo Morais GA, Scholkmann F, Balardin JB, Furucho RA, de Paula RCV, Biazoli CE, Sato JR. Non-neuronal evoked and spontaneous hemodynamic changes in the anterior temporal region of the human head may lead to misinterpretations of functional near-infrared spectroscopy signals. NEUROPHOTONICS 2018; 5:011002. [PMID: 28840166 PMCID: PMC5566266 DOI: 10.1117/1.nph.5.1.011002] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 07/24/2017] [Indexed: 05/18/2023]
Abstract
Several functional near-infrared spectroscopy (fNIRS) studies report their findings based on changes of a single chromophore, usually concentration changes of oxygenated hemoglobin ([[Formula: see text]]) or deoxygenated hemoglobin (HHb). However, influence of physiological actions may differ depending on which element is considered and the assumption that the chosen measure correlates with the neural response of interest might not hold. By assessing the correlation between [[Formula: see text]] and [HHb] in task-evoked activity as well as resting-state data, we identified a spatial dependency of non-neuronal hemodynamic changes in the anterior temporal region of the human head. Our findings support the importance of reporting and discussing fNIRS outcomes obtained with both chromophores ([[Formula: see text]] and [HHb]), in particular, for studies concerning the anterior temporal region of the human head. This practice should help to achieve a physiologically correct interpretation of the results when no measurements with short-distance channels are available while employing continuous-wave fNIRS systems.
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Affiliation(s)
| | - Felix Scholkmann
- University of Zurich, University Hospital Zurich, Biomedical Optics Research Laboratory, Department of Neonatology, Zurich, Switzerland
| | - Joana Bisol Balardin
- Universidade Federal do ABC, Center for Mathematics Computing and Cognition, São Bernardo do Campo, Brazil
- Instituto do Cérebro, Hospital Israelita Albert Einstein, São Paulo, Brazil
| | - Rogério Akira Furucho
- Universidade Federal do ABC, Center for Mathematics Computing and Cognition, São Bernardo do Campo, Brazil
| | | | - Claudinei Eduardo Biazoli
- Universidade Federal do ABC, Center for Mathematics Computing and Cognition, São Bernardo do Campo, Brazil
| | - João Ricardo Sato
- Universidade Federal do ABC, Center for Mathematics Computing and Cognition, São Bernardo do Campo, Brazil
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202
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Zhang M, Mary Ying YL, Ihlefeld A. Spatial Release From Informational Masking: Evidence From Functional Near Infrared Spectroscopy. Trends Hear 2018; 22:2331216518817464. [PMID: 30558491 PMCID: PMC6299332 DOI: 10.1177/2331216518817464] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 10/31/2018] [Accepted: 11/13/2018] [Indexed: 11/30/2022] Open
Abstract
Informational masking (IM) can greatly reduce speech intelligibility, but the neural mechanisms underlying IM are not understood. Binaural differences between target and masker can improve speech perception. In general, improvement in masked speech intelligibility due to provision of spatial cues is called spatial release from masking. Here, we focused on an aspect of spatial release from masking, specifically, the role of spatial attention. We hypothesized that in a situation with IM background sound (a) attention to speech recruits lateral frontal cortex (LFCx) and (b) LFCx activity varies with direction of spatial attention. Using functional near infrared spectroscopy, we assessed LFCx activity bilaterally in normal-hearing listeners. In Experiment 1, two talkers were simultaneously presented. Listeners either attended to the target talker (speech task) or they listened passively to an unintelligible, scrambled version of the acoustic mixture (control task). Target and masker differed in pitch and interaural time difference (ITD). Relative to the passive control, LFCx activity increased during attentive listening. Experiment 2 measured how LFCx activity varied with ITD, by testing listeners on the speech task in Experiment 1, except that talkers either were spatially separated by ITD or colocated. Results show that directing of auditory attention activates LFCx bilaterally. Moreover, right LFCx is recruited more strongly in the spatially separated as compared with colocated configurations. Findings hint that LFCx function contributes to spatial release from masking in situations with IM.
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Affiliation(s)
- Min Zhang
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ, USA
- Graduate School of Biomedical Sciences, Rutgers University, Newark, NJ, USA
| | - Yu-Lan Mary Ying
- Department of Otolaryngology-Head and Neck Surgery, Rutgers New Jersey Medical School, Newark, NJ, USA
| | - Antje Ihlefeld
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ, USA
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203
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Sintsov M, Suchkov D, Khazipov R, Minlebaev M. Developmental Changes in Sensory-Evoked Optical Intrinsic Signals in the Rat Barrel Cortex. Front Cell Neurosci 2017; 11:392. [PMID: 29311827 PMCID: PMC5733043 DOI: 10.3389/fncel.2017.00392] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 11/27/2017] [Indexed: 12/17/2022] Open
Abstract
Optical Intrinsic Signal imaging (OISi) is a powerful technique for optical brain studies. OIS mainly reflects the hemodynamic response (HR) and metabolism, but it may also involve changes in tissue light scattering (LS) caused by transient cellular swelling in the active tissue. Here, we explored the developmental features of sensory-evoked OIS in the rat barrel cortex during the first 3 months after birth. Multispectral OISi revealed that two temporally distinct components contribute to the neonatal OIS: an early phase of LS followed by a late phase of HR. The contribution of LS to the early response was also evidenced by an increase in light transmission through the active barrel. The early OIS phase correlated in time and amplitude with the sensory-evoked electrophysiological response. Application of the Modified Beer-Lambert Law (MBLL) to the OIS data revealed that HR during the early phase involved only a slight decrease in blood oxygenation without any change in blood volume. In contrast, HR during the late phase manifested an adult-like increase in blood volume and oxygenation. During development, the peak time of the delayed HR progressively shortened with age, nearly reaching the stimulus onset and overlapping with the early LS phase by the fourth postnatal week. Thus, LS contributes to the sensory-evoked OIS in the barrel cortex of rats at all ages, and it dominates the early OIS phase in neonatal rats due to delayed HR. Our results are also consistent with the delayed blood oxygen level dependent (BOLD) signal in human preterm infants.
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Affiliation(s)
- Mikhail Sintsov
- Laboratory of Neurobiology, Kazan Federal University, Kazan, Russia
| | - Dmitrii Suchkov
- Laboratory of Neurobiology, Kazan Federal University, Kazan, Russia
| | - Rustem Khazipov
- Laboratory of Neurobiology, Kazan Federal University, Kazan, Russia.,INMED-INSERM U901, Aix-Marseille University, Marseille, France
| | - Marat Minlebaev
- Laboratory of Neurobiology, Kazan Federal University, Kazan, Russia.,INMED-INSERM U901, Aix-Marseille University, Marseille, France
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204
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Lin TC, Chen JC, Liu CH, Lee CY, Tsou YA, Chuang CC. A feasibility study on non-invasive oxidative metabolism detection and acoustic assessment of human vocal cords by using optical technique. Sci Rep 2017; 7:17002. [PMID: 29208920 PMCID: PMC5716992 DOI: 10.1038/s41598-017-16807-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 11/16/2017] [Indexed: 01/08/2023] Open
Abstract
Voice disorder such as vocal fatigue is a common and complex multifaceted clinical problem that presents a significant impact on quality of life. In this study, the functional near-infrared diffuse optical technique (fNIRS-DOT) was proposed as a novel approach for human vocal cords oxidative metabolism detection and acoustic assessment simultaneously to provide a multidimensional assessment of voice disorder. A totally of 60 healthy subjects included 30 male and 30 female adults of age-matched were recruited and performed a vocal loading task to trigger a mild inflammation of the vocal cords in this study. In the results of oxidative metabolism, the vocal cords expressed hypoxia after vocal loading task in both male and female groups that could provide relevant information on the relationship between tissue oxygen consumption and supply for vocal cords diagnosis. Additionally, the results of optical acoustic assessment revealed the worse/changes voice quality after vocal loading task. Therefore, integration of non-invasive oxidative metabolism detection and acoustic assessment by using optical technique could provide more relevant information for diagnosis of voice disorders. The multi-functional vocal cords detection system could provide a good feasibility for clinical applications such as diagnosis and therapeutic monitoring of voice disorder.
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Affiliation(s)
- Tzu-Chieh Lin
- Department of Otolaryngology, China Medical University Hospital, Taichung, 40447, Taiwan
| | - Jung-Chih Chen
- Institute of Biomedical Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan
| | - Chih-Hsien Liu
- Department of Otolaryngology, Hsinchu Cathay General Hospital, Hsinchu, 30060, Taiwan
| | - Chia-Yen Lee
- Department of Electrical Engineering, National United University, Miaoli, 36063, Taiwan
| | - Yung-An Tsou
- Department of Otolaryngology, China Medical University Hospital, Taichung, 40447, Taiwan
| | - Ching-Cheng Chuang
- Institute of Biomedical Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan.
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205
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Shin J, Kwon J, Choi J, Im CH. Performance enhancement of a brain-computer interface using high-density multi-distance NIRS. Sci Rep 2017; 7:16545. [PMID: 29185494 PMCID: PMC5707382 DOI: 10.1038/s41598-017-16639-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 11/15/2017] [Indexed: 01/12/2023] Open
Abstract
This study investigated the effectiveness of using a high-density multi-distance source-detector (SD) separations in near-infrared spectroscopy (NIRS), for enhancing the performance of a functional NIRS (fNIRS)-based brain-computer interface (BCI). The NIRS system that was used for the experiment was capable of measuring signals from four SD separations: 15, 21.2, 30, and 33.5 mm, and this allowed the measurement of hemodynamic response alterations at various depths. Fifteen participants were asked to perform mental arithmetic and word chain tasks, to induce task-related hemodynamic response variations, or they were asked to stay relaxed to acquire a baseline signal. To evaluate the degree of BCI performance enhancement by high-density channel configuration, the classification accuracy obtained using a typical low-density lattice SD arrangement, was compared to that obtained using the high-density SD arrangement, while maintaining the SD separation at 30 mm. The analysis results demonstrated that the use of a high-density channel configuration did not result in a noticeable enhancement of classification accuracy. However, the combination of hemodynamic variations, measured by two multi-distance SD separations, resulted in the significant enhancement of overall classification accuracy. The results of this study indicated that the use of high-density multi-distance SD separations can likely provide a new method for enhancing the performance of an fNIRS-BCI.
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Affiliation(s)
- Jaeyoung Shin
- Department of Biomedical Engineering, Hanyang University, Seoul, Korea
| | - Jinuk Kwon
- Department of Biomedical Engineering, Hanyang University, Seoul, Korea
| | | | - Chang-Hwan Im
- Department of Biomedical Engineering, Hanyang University, Seoul, Korea.
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206
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Hemasiri BWNH, Kim JK, Lee JM. Synthesis and Characterization of Graphene/ITO Nanoparticle Hybrid Transparent Conducting Electrode. NANO-MICRO LETTERS 2017; 10:18. [PMID: 30393667 PMCID: PMC6199067 DOI: 10.1007/s40820-017-0174-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 11/14/2017] [Indexed: 06/08/2023]
Abstract
The combination of graphene with conductive nanoparticles, forming graphene-nanoparticle hybrid materials, offers a number of excellent properties for advanced engineering applications. A novel and simple method was developed to deposit 10 wt% tin-doped indium tin oxide (ITO) nanoparticles on graphene. The method involved a combination of a solution-based environmentally friendly electroless deposition approach and subsequent vacuum annealing. A stable organic-free solution of ITO was prepared from economical salts of In(NO3)3 ·H2O and SnCl4. The obtained ITO nanostructure exhibited a unique architecture, with uniformly dispersed 25-35 nm size ITO nanoparticles, containing only the crystallized In2O3 phase. The synthesized ITO nanoparticles-graphene hybrid exhibited very good and reproducible optical transparency in the visible range (more than 85%) and a 28.2% improvement in electrical conductivity relative to graphene synthesized by chemical vapor deposition. It was observed that the ITO nanoparticles affect the position of the Raman signal of graphene, in which the D, G, and 2D peaks were redshifted by 5.65, 5.69, and 9.74 cm-1, respectively, and the annealing conditions had no significant effect on the Raman signatures of graphene.
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Affiliation(s)
| | - Jae-Kwan Kim
- Department of Printed Electronics Engineering, Sunchon National University, Suncheon, Jeonnam, 57922, South Korea
| | - Ji-Myon Lee
- Department of Printed Electronics Engineering, Sunchon National University, Suncheon, Jeonnam, 57922, South Korea.
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207
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Benthic Habitat Mapping Using Multispectral High-Resolution Imagery: Evaluation of Shallow Water Atmospheric Correction Techniques. SENSORS 2017; 17:s17112639. [PMID: 29144444 PMCID: PMC5713018 DOI: 10.3390/s17112639] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 11/07/2017] [Accepted: 11/14/2017] [Indexed: 11/16/2022]
Abstract
Remote multispectral data can provide valuable information for monitoring coastal water ecosystems. Specifically, high-resolution satellite-based imaging systems, as WorldView-2 (WV-2), can generate information at spatial scales needed to implement conservation actions for protected littoral zones. However, coastal water-leaving radiance arriving at the space-based sensor is often small as compared to reflected radiance. In this work, complex approaches, which usually use an accurate radiative transfer code to correct the atmospheric effects, such as FLAASH, ATCOR and 6S, have been implemented for high-resolution imagery. They have been assessed in real scenarios using field spectroradiometer data. In this context, the three approaches have achieved excellent results and a slightly superior performance of 6S model-based algorithm has been observed. Finally, for the mapping of benthic habitats in shallow-waters marine protected environments, a relevant application of the proposed atmospheric correction combined with an automatic deglinting procedure is presented. This approach is based on the integration of a linear mixing model of benthic classes within the radiative transfer model of the water. The complete methodology has been applied to selected ecosystems in the Canary Islands (Spain) but the obtained results allow the robust mapping of the spatial distribution and density of seagrass in coastal waters and the analysis of multitemporal variations related to the human activity and climate change in littoral zones.
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208
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Spatio-temporal dynamics of multimodal EEG-fNIRS signals in the loss and recovery of consciousness under sedation using midazolam and propofol. PLoS One 2017; 12:e0187743. [PMID: 29121108 PMCID: PMC5679575 DOI: 10.1371/journal.pone.0187743] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 10/25/2017] [Indexed: 12/29/2022] Open
Abstract
On sedation motivated by the clinical needs for safety and reliability, recent studies have attempted to identify brain-specific signatures for tracking patient transition into and out of consciousness, but the differences in neurophysiological effects between 1) the sedative types and 2) the presence/absence of surgical stimulations still remain unclear. Here we used multimodal electroencephalography–functional near-infrared spectroscopy (EEG–fNIRS) measurements to observe electrical and hemodynamic responses during sedation simultaneously. Forty healthy volunteers were instructed to push the button to administer sedatives in response to auditory stimuli every 9–11 s. To generally illustrate brain activity at repetitive transition points at the loss of consciousness (LOC) and the recovery of consciousness (ROC), patient-controlled sedation was performed using two different sedatives (midazolam (MDZ) and propofol (PPF)) under two surgical conditions. Once consciousness was lost via sedatives, we observed gradually increasing EEG power at lower frequencies (<15 Hz) and decreasing power at higher frequencies (>15 Hz), as well as spatially increased EEG powers in the delta and lower alpha bands, and particularly also in the upper alpha rhythm, at the frontal and parieto-occipital areas over time. During ROC from unconsciousness, these spatio-temporal changes were reversed. Interestingly, the level of consciousness was switched on/off at significantly higher effect-site concentrations of sedatives in the brain according to the use of surgical stimuli, but the spatio-temporal EEG patterns were similar, regardless of the sedative used. We also observed sudden phase shifts in fronto-parietal connectivity at the LOC and the ROC as critical points. fNIRS measurement also revealed mild hemodynamic fluctuations. Compared with general anesthesia, our results provide insights into critical hallmarks of sedative-induced (un)consciousness, which have similar spatio-temporal EEG-fNIRS patterns regardless of the stage and the sedative used.
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209
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Vergotte G, Torre K, Chirumamilla VC, Anwar AR, Groppa S, Perrey S, Muthuraman M. Dynamics of the human brain network revealed by time-frequency effective connectivity in fNIRS. BIOMEDICAL OPTICS EXPRESS 2017; 8:5326-5341. [PMID: 29188123 PMCID: PMC5695973 DOI: 10.1364/boe.8.005326] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 09/06/2017] [Accepted: 09/11/2017] [Indexed: 05/15/2023]
Abstract
Functional near infrared spectroscopy (fNIRS) is a promising neuroimaging method for investigating networks of cortical regions over time. We propose a directed effective connectivity method (TPDC) allowing the capture of both time and frequency evolution of the brain's networks using fNIRS data acquired from healthy subjects performing a continuous finger-tapping task. Using this method we show the directed connectivity patterns among cortical motor regions involved in the task and their significant variations in the strength of information flow exchanges. Intra and inter-hemispheric connections during the motor task with their temporal evolution are also provided. Characterisation of the fluctuations in brain connectivity opens up a new way to assess the organisation of the brain to adapt to changing task constraints, or under pathological conditions.
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Affiliation(s)
| | | | - Venkata Chaitanya Chirumamilla
- Movement Disorders and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, Focus Program Translational Neuroscience (FTN), Department of Neurology, Johannes Gutenberg University, Mainz, Germany
| | - Abdul Rauf Anwar
- Biomedical Engineering Department, UET Lahore (KSK), Lahore, Pakistan
| | - Sergiu Groppa
- Movement Disorders and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, Focus Program Translational Neuroscience (FTN), Department of Neurology, Johannes Gutenberg University, Mainz, Germany
| | | | - Muthuraman Muthuraman
- Movement Disorders and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, Focus Program Translational Neuroscience (FTN), Department of Neurology, Johannes Gutenberg University, Mainz, Germany
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210
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Kim TJ, Lee BU, Sunwoo JS, Byun JI, Moon J, Lee ST, Jung KH, Chu K, Kim M, Lim JM, Lee E, Lee SK, Jung KY. The effect of dim light at night on cerebral hemodynamic oscillations during sleep: A near-infrared spectroscopy study. Chronobiol Int 2017; 34:1325-1338. [PMID: 29064336 DOI: 10.1080/07420528.2017.1363225] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Recent studies have reported that dim light at night (dLAN) is associated with risks of cardiovascular complications, such as hypertension and carotid atherosclerosis; however, little is known about the underlying mechanism. Here, we evaluated the effect of dLAN on the cerebrovascular system by analyzing cerebral hemodynamic oscillations using near-infrared spectroscopy (NIRS). Fourteen healthy male subjects underwent polysomnography coupled with cerebral NIRS. The data collected during sleep with dim light (10 lux) were compared with those collected during sleep under the control dark conditions for the sleep structure, cerebral hemodynamic oscillations, heart rate variability (HRV), and their electroencephalographic (EEG) power spectrum. Power spectral analysis was applied to oxy-hemoglobin concentrations calculated from the NIRS signal. Spectral densities over endothelial very-low-frequency oscillations (VLFOs) (0.003-0.02 Hz), neurogenic VLFOs (0.02-0.04 Hz), myogenic low-frequency oscillations (LFOs) (0.04-0.15 Hz), and total LFOs (0.003-0.15 Hz) were obtained for each sleep stage. The polysomnographic data revealed an increase in the N2 stage under the dLAN conditions. The spectral analysis of cerebral hemodynamics showed that the total LFOs increased significantly during slow-wave sleep (SWS) and decreased during rapid eye movement (REM) sleep. Specifically, endothelial (median of normalized value, 0.46 vs. 0.72, p = 0.019) and neurogenic (median, 0.58 vs. 0.84, p = 0.019) VLFOs were enhanced during SWS, whereas endothelial VLFOs (median, 1.93 vs. 1.47, p = 0.030) were attenuated during REM sleep. HRV analysis exhibited altered spectral densities during SWS induced by dLAN, including an increase in very-low-frequency and decreases in low-frequency and high-frequency ranges. In the EEG power spectral analysis, no significant difference was detected between the control and dLAN conditions. In conclusion, dLAN can disturb cerebral hemodynamics via the endothelial and autonomic systems without cortical involvement, predominantly during SWS, which might represent an underlying mechanism of the increased cerebrovascular risk associated with light exposure during sleep.
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Affiliation(s)
- Tae-Joon Kim
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea
| | - Byeong Uk Lee
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea
| | - Jun-Sang Sunwoo
- b Department of Neurology , Soonchunhyang University Seoul Hospital , Seoul , South Korea
| | - Jung-Ick Byun
- c Department of Neurology , Kyung Hee University Hospital at Gangdong , Seoul , South Korea
| | - Jangsup Moon
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea
| | - Soon-Tae Lee
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea
| | - Keun-Hwa Jung
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea
| | - Kon Chu
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea
| | - Manho Kim
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea.,d Neuroscience and Protein Metabolism Medical Research Center , Seoul National University College of Medicine , Seoul , South Korea
| | - Jong-Min Lim
- e Department of Lighting Environment Research , Korea Institute of Lighting Technology , Seoul , South Korea
| | - Eunil Lee
- f Department of Preventive Medicine , Korea University College of Medicine , Seoul , South Korea
| | - Sang Kun Lee
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea
| | - Ki-Young Jung
- a Department of Neurology , Seoul National University Hospital , Seoul , South Korea
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211
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Kassab A, Le Lan J, Tremblay J, Vannasing P, Dehbozorgi M, Pouliot P, Gallagher A, Lesage F, Sawan M, Nguyen DK. Multichannel wearable fNIRS-EEG system for long-term clinical monitoring. Hum Brain Mapp 2017; 39:7-23. [PMID: 29058341 DOI: 10.1002/hbm.23849] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 10/02/2017] [Accepted: 10/08/2017] [Indexed: 01/27/2023] Open
Abstract
Continuous brain imaging techniques can be beneficial for the monitoring of neurological pathologies (such as epilepsy or stroke) and neuroimaging protocols involving movement. Among existing ones, functional near-infrared spectroscopy (fNIRS) and electroencephalography (EEG) have the advantage of being noninvasive, nonobstructive, inexpensive, yield portable solutions, and offer complementary monitoring of electrical and local hemodynamic activities. This article presents a novel system with 128 fNIRS channels and 32 EEG channels with the potential to cover a larger fraction of the adult superficial cortex than earlier works, is integrated with 32 EEG channels, is light and battery-powered to improve portability, and can transmit data wirelessly to an interface for real-time display of electrical and hemodynamic activities. A novel fNIRS-EEG stretchable cap, two analog channels for auxiliary data (e.g., electrocardiogram), eight digital triggers for event-related protocols and an internal accelerometer for movement artifacts removal contribute to improve data acquisition quality. The system can run continuously for 24 h. Following instrumentation validation and reliability on a solid phantom, performance was evaluated on (1) 12 healthy participants during either a visual (checkerboard) task at rest or while pedalling on a stationary bicycle or a cognitive (language) task and (2) 4 patients admitted either to the epilepsy (n = 3) or stroke (n = 1) units. Data analysis confirmed expected hemodynamic variations during validation recordings and useful clinical information during in-hospital testing. To the best of our knowledge, this is the first demonstration of a wearable wireless multichannel fNIRS-EEG monitoring system in patients with neurological conditions. Hum Brain Mapp 39:7-23, 2018. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Ali Kassab
- Research Center, Centre Hospitalier Universitaire de Montréal, Université de Montréal, Montréal, Québec, H2X 0A9, Canada
| | - Jérôme Le Lan
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Julie Tremblay
- Research Center, Hôpital Sainte-Justine, Université de Montréal, Montréal, Québec, H3T 1C4, Canada
| | - Phetsamone Vannasing
- Research Center, Hôpital Sainte-Justine, Université de Montréal, Montréal, Québec, H3T 1C4, Canada
| | - Mahya Dehbozorgi
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Philippe Pouliot
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada.,Research Center, Montreal Heart Institute, Montréal, Québec, H1T 1C8, Canada
| | - Anne Gallagher
- Research Center, Hôpital Sainte-Justine, Université de Montréal, Montréal, Québec, H3T 1C4, Canada
| | - Frédéric Lesage
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Mohamad Sawan
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Dang Khoa Nguyen
- Research Center, Centre Hospitalier Universitaire de Montréal, Université de Montréal, Montréal, Québec, H2X 0A9, Canada.,Department of Neurology, Hôpital Notre-Dame (Centre Hospitalier de l'Université de Montréal), Montréal, Québec, H2L 4M1, Canada
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212
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Zhang Y, Yang Y, Si J, Xia X, He J, Jiang T. Influence of inter-stimulus interval of spinal cord stimulation in patients with disorders of consciousness: A preliminary functional near-infrared spectroscopy study. NEUROIMAGE-CLINICAL 2017; 17:1-9. [PMID: 29619317 PMCID: PMC5883216 DOI: 10.1016/j.nicl.2017.09.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 09/12/2017] [Accepted: 09/23/2017] [Indexed: 11/30/2022]
Abstract
Spinal cord stimulation (SCS) is a promising treatment for disorders of consciousness (DOC), but the underlying mechanism and most effective procedures remain uncertain. To optimize the protocol, previous studies evaluated the frequency-specific effects of SCS on neurophysiological activities. However, whether and how the inter-stimulus interval (ISI) parameter affects the SCS neuromodulation in DOC remains unknown. We enrolled nine DOC patients who had implanted SCS devices and conducted three different durations of ISIs. Using functional near-infrared spectroscopy (fNIRS), we monitored the blood volume fluctuations in the prefrontal and occipital cortices during the SCS. The results showed that short stimuli (30 s) induced significant cerebral blood volume changes, especially in the prefrontal cortex, an important area in the consciousness system. By comparing the mean value of the responses from the first and the last block in each session, a shorter ISI was found to improve the blood volume in the prefrontal cortex. This phenomenon was more significant for the subgroup of patients with a favorable prognosis. These preliminary results imply that the ISI may be an important factor for SCS. The research paradigm proposed here also provides insights for further quantitative evaluations of the therapeutic effects of neuromodulation. Spinal cord stimulation rapidly evokes activity in consciousness-related brain areas. Inter-stimulus interval of neuromodulation is important for treating disorders of consciousness. Shorter inter-stimulus interval can better improve the blood volume in frontal area. Near-infrared spectroscopy is feasible for evaluating neuromodulation effects.
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Key Words
- ARAS, ascending reticular activating system
- CBF, cerebral blood flow
- DBS, deep brain stimulation
- DOC, disorders of consciousness
- Disorders of consciousness
- EEG, electroencephalography
- FWHM, full-width-at-half-maximum
- Functional near-infrared spectroscopy
- GOS, Glasgow Outcome Scale
- HbO, oxygenated hemoglobin
- HbR, deoxygenated hemoglobin
- HbT, total hemoglobin
- ISI, inter-stimulus interval
- Inter-stimulus interval
- JFKCRS-R, JFK Coma Recovery Scale
- LTP, long-term potentiation
- MBLL, modified Beer-Lambert law
- MCS, minimally conscious state
- MSN, medium spiny neuron
- Prefrontal cortex
- SCS, spinal cord stimulation
- Spinal cord stimulation
- TMS, transcranial magnetic stimulation
- VS, vegetative state
- fMRI, functional magnetic resonance imaging
- fNIRS, functional near-infrared spectroscopy
- rCBV, regional cerebral blood volume
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Affiliation(s)
- Yujin Zhang
- Brainnetome Center, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China
| | - Yi Yang
- Department of Neurosurgery, PLA Army General Hospital, Beijing 100700, China
| | - Juanning Si
- Brainnetome Center, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiaoyu Xia
- Department of Neurosurgery, PLA Army General Hospital, Beijing 100700, China
| | - Jianghong He
- Department of Neurosurgery, PLA Army General Hospital, Beijing 100700, China.
| | - Tianzi Jiang
- Brainnetome Center, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; Key Laboratory for NeuroInformation of the Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 625014, China; CAS Center for Excellence in Brain Science, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; Queensland Brain Institute, University of Queensland, St. Lucia, Queensland 4072, Australia.
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213
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Prefrontal cortical responses in children with prenatal alcohol-related neurodevelopmental impairment: A functional near-infrared spectroscopy study. Clin Neurophysiol 2017; 128:2099-2109. [PMID: 28914230 DOI: 10.1016/j.clinph.2017.08.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 07/06/2017] [Accepted: 08/13/2017] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Disruption in the neural activation of the prefrontal cortex (PFC) in modulating arousal was explored in children with heavy prenatal alcohol exposure (PAE), who have known neurobehavioral impairment. METHODS During a task that elicits frustration, functional near-infrared spectroscopy (fNIRS) was used to measure PFC activation, specifically levels of oxygenated (HBO) and deoxygenated (HBR) hemoglobin, in children with PAE (n=18) relative to typically developing Controls (n=12) and a Clinical Contrast group with other neurodevelopmental or behavioral problems (n=14). RESULTS Children with PAE had less activation during conditions with positive emotional arousal, as indicated by lower levels of HBO in the medial areas of the PFC and higher levels of HBR in all areas of the PFC sampled relative to both other groups. Children in the Control group demonstrated greater differentiation of PFC activity than did children with PAE. Children in the Clinical Contrast group demonstrated the greatest differences in PFC activity between valences of task conditions. CONCLUSIONS Specific patterns of PFC activation differentiated children with PAE from typically developing children and children with other clinical problems. SIGNIFICANCE FNIRS assessments of PFC activity provide new insights regarding the mechanisms of commonly seen neurobehavioral dysfunction in children with PAE.
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214
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Pollonini L, Younes L, Gorniak SL. Hemodynamic function during finger force production tasks in healthy adults. Muscle Nerve 2017; 56:472-478. [PMID: 27935081 PMCID: PMC6510247 DOI: 10.1002/mus.25499] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 11/23/2016] [Accepted: 11/30/2016] [Indexed: 11/11/2022]
Abstract
INTRODUCTION Near-infrared spectroscopy (NIRS) is a noninvasive technique used to measure muscle hemodynamics. The focus of this study was to evaluate changes in muscle oxygenation during sustained maximal force production in young, healthy control individuals to establish baseline function in an ideal population. METHODS NIRS was used to monitor reduced hemoglobin (HbR) and oxygenated hemoglobin (HbO) in forearm muscles. Hemodynamic responses during force production tasks were monitored in real time. RESULTS During handgrip exercises, maximal force production declined significantly. Increased HbR was found while HbO remained constant. The correlation between force production and HbO was positive (r = 0.18), while the correlation between force and HbR was negative (r = -0.48). The application of NIRS to monitor the correlation between force production and hemodynamic measures in the forearm was successful. These data set the foundation for future use of NIRS as a diagnostic tool for individuals with peripheral vascular disease: Muscle Nerve 56: 472-478, 2017.
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Affiliation(s)
- Luca Pollonini
- Department of Engineering Technology, University of Houston, Houston, TX 77204
- Abramson Center for the Future of Health, University of Houston, Houston, TX 77204
| | - Lena Younes
- Center for Neuromotor and Biomechanics Research, University of Houston, Houston, TX 77204
| | - Stacey L. Gorniak
- Center for Neuromotor and Biomechanics Research, University of Houston, Houston, TX 77204
- Department of Health and Human Performance, University of Houston, Houston, TX 77204
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215
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Racz FS, Mukli P, Nagy Z, Eke A. Increased prefrontal cortex connectivity during cognitive challenge assessed by fNIRS imaging. BIOMEDICAL OPTICS EXPRESS 2017; 8:3842-3855. [PMID: 28856054 PMCID: PMC5560845 DOI: 10.1364/boe.8.003842] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 05/05/2017] [Accepted: 05/30/2017] [Indexed: 05/24/2023]
Abstract
In this study, functional near-infrared spectroscopy (fNIRS) and the graph theory approach were used to access the functional connectivity (FC) of the prefrontal cortex (PFC) in a resting state and during increased mental workload. For this very purpose, a pattern recognition-based test was developed, which elicited a strong response throughout the PFC during the test condition. FC parameters obtained during stimulation were found increased compared to those in a resting state after correlation based signal improvement (CBSI), which can attenuate those components of fNIRS signals which are unrelated to neural activity. These results indicate that the cognitive challenge increased the FC in the PFC and suggests a great potential in investigating FC in various cognitive states.
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Affiliation(s)
- Frigyes Samuel Racz
- Institute of Clinical Experimental Research, Semmelweis University, 37-43 Tűzoltó Street, Budapest 1094, Hungary
- Department of Physiology, 37-43 Tűzoltó Street, Budapest 1094, Hungary
| | - Peter Mukli
- Institute of Clinical Experimental Research, Semmelweis University, 37-43 Tűzoltó Street, Budapest 1094, Hungary
- Department of Physiology, 37-43 Tűzoltó Street, Budapest 1094, Hungary
| | - Zoltan Nagy
- Institute of Clinical Experimental Research, Semmelweis University, 37-43 Tűzoltó Street, Budapest 1094, Hungary
| | - Andras Eke
- Institute of Clinical Experimental Research, Semmelweis University, 37-43 Tűzoltó Street, Budapest 1094, Hungary
- Department of Physiology, 37-43 Tűzoltó Street, Budapest 1094, Hungary
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216
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Classification of somatosensory cortex activities using fNIRS. Behav Brain Res 2017; 333:225-234. [PMID: 28668280 DOI: 10.1016/j.bbr.2017.06.034] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 06/10/2017] [Accepted: 06/20/2017] [Indexed: 01/08/2023]
Abstract
The ability of the somatosensory cortex in differentiating various tactile sensations is very important for a person to perceive the surrounding environment. In this study, we utilize a lab-made multi-channel functional near-infrared spectroscopy (fNIRS) to discriminate the hemodynamic responses (HRs) of four different tactile stimulations (handshake, ball grasp, poking, and cold temperature) applied to the right hand of eight healthy male subjects. The activated brain areas per stimulation are identified with the t-values between the measured data and the desired hemodynamic response function. Linear discriminant analysis is utilized to classify the acquired data into four classes based on three features (mean, peak value, and skewness) of the associated oxy-hemoglobin (HbO) signals. The HRs evoked by the handshake and poking stimulations showed higher peak values in HbO than the ball grasp and cold temperature stimulations. For comparison purposes, additional two-class classifications of poking vs. temperature and handshake vs. ball grasp were performed. The attained classification accuracies were higher than the corresponding chance levels. Our results indicate that fNIRS can be used as an objective measure discriminating different tactile stimulations from the somatosensory cortex of human brain.
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217
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Niemann MJ, Sørensen H, Siebenmann C, Lundby C, Secher NH. Carbon monoxide reduces near-infrared spectroscopy determined ‘total’ hemoglobin: a human volunteer study. Scandinavian Journal of Clinical and Laboratory Investigation 2017; 77:259-262. [DOI: 10.1080/00365513.2017.1299209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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218
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Shin J, Müller KR, Schmitz CH, Kim DW, Hwang HJ. Evaluation of a Compact Hybrid Brain-Computer Interface System. BIOMED RESEARCH INTERNATIONAL 2017; 2017:6820482. [PMID: 28373984 PMCID: PMC5360992 DOI: 10.1155/2017/6820482] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 10/20/2016] [Indexed: 11/17/2022]
Abstract
We realized a compact hybrid brain-computer interface (BCI) system by integrating a portable near-infrared spectroscopy (NIRS) device with an economical electroencephalography (EEG) system. The NIRS array was located on the subjects' forehead, covering the prefrontal area. The EEG electrodes were distributed over the frontal, motor/temporal, and parietal areas. The experimental paradigm involved a Stroop word-picture matching test in combination with mental arithmetic (MA) and baseline (BL) tasks, in which the subjects were asked to perform either MA or BL in response to congruent or incongruent conditions, respectively. We compared the classification accuracies of each of the modalities (NIRS or EEG) with that of the hybrid system. We showed that the hybrid system outperforms the unimodal EEG and NIRS systems by 6.2% and 2.5%, respectively. Since the proposed hybrid system is based on portable platforms, it is not confined to a laboratory environment and has the potential to be used in real-life situations, such as in neurorehabilitation.
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Affiliation(s)
- Jaeyoung Shin
- Machine Learning Group, Berlin Institute of Technology, Berlin, Germany
| | - Klaus-Robert Müller
- Machine Learning Group, Berlin Institute of Technology, Berlin, Germany
- Department of Brain and Cognitive Engineering, Korea University, Seoul, Republic of Korea
| | | | - Do-Won Kim
- Machine Learning Group, Berlin Institute of Technology, Berlin, Germany
- Department of Biomedical Engineering, Chonnam National University, Yeosu, Republic of Korea
| | - Han-Jeong Hwang
- Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi, Republic of Korea
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219
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Baldacci L, Pagano M, Masini L, Toncelli A, Carelli G, Storchi P, Tredicucci A. Non-invasive absolute measurement of leaf water content using terahertz quantum cascade lasers. PLANT METHODS 2017; 13:51. [PMID: 28638439 PMCID: PMC5474302 DOI: 10.1186/s13007-017-0197-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
BACKGROUND Plant water resource management is one of the main future challenges to fight recent climatic changes. The knowledge of the plant water content could be indispensable for water saving strategies. Terahertz spectroscopic techniques are particularly promising as a non-invasive tool for measuring leaf water content, thanks to the high predominance of the water contribution to the total leaf absorption. Terahertz quantum cascade lasers (THz QCL) are one of the most successful sources of THz radiation. RESULTS Here we present a new method which improves the precision of THz techniques by combining a transmission measurement performed using a THz QCL source, with simple pictures of leaves taken by an optical camera. As a proof of principle, we performed transmission measurements on six plants of Vitis vinifera L. (cv "Colorino"). We found a linear law which relates the leaf water mass to the product between the leaf optical depth in the THz and the projected area. Results are in optimal agreement with the proposed law, which reproduces the experimental data with 95% accuracy. CONCLUSIONS This method may overcome the issues related to intra-variety heterogeneities and retrieve the leaf water mass in a fast, simple, and non-invasive way. In the future this technique could highlight different behaviours in preserving the water status during drought stress.
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Affiliation(s)
- Lorenzo Baldacci
- NEST, CNR Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
| | - Mario Pagano
- Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Centro di ricerca per la Viticoltura e l’Enologia, Viale Santa Margherita 80, 52100 Arezzo, Italy
| | - Luca Masini
- NEST, CNR Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
| | - Alessandra Toncelli
- NEST, CNR Istituto Nanoscienze and Dipartimento di Fisica, Università di Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy
| | - Giorgio Carelli
- Dipartimento di Fisica, Università di Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy
| | - Paolo Storchi
- Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Centro di ricerca per la Viticoltura e l’Enologia, Viale Santa Margherita 80, 52100 Arezzo, Italy
| | - Alessandro Tredicucci
- NEST, CNR Istituto Nanoscienze and Dipartimento di Fisica, Università di Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy
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220
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Teng F, Cormier T, Sauer-Budge A, Chaudhury R, Pera V, Istfan R, Chargin D, Brookfield S, Ko NY, Roblyer DM. Wearable near-infrared optical probe for continuous monitoring during breast cancer neoadjuvant chemotherapy infusions. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:14001. [PMID: 28114449 PMCID: PMC5289133 DOI: 10.1117/1.jbo.22.1.014001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 12/21/2016] [Indexed: 05/04/2023]
Abstract
We present a new continuous-wave wearable diffuse optical probe aimed at investigating the hemodynamic response of locally advanced breast cancer patients during neoadjuvant chemotherapy infusions. The system consists of a flexible printed circuit board that supports an array of six dual wavelength surface-mount LED and photodiode pairs. The probe is encased in a soft silicone housing that conforms to natural breast shape. Probe performance was evaluated using tissue-simulating phantoms and in vivo normal volunteer measurements. High SNR (71 dB), low source-detector crosstalk ( ? 60 ?? dB ), high measurement precision (0.17%), and good thermal stability (0.22% V rms / ° C ) were achieved in phantom studies. A cuff occlusion experiment was performed on the forearm of a healthy volunteer to demonstrate the ability to track rapid hemodynamic changes. Proof-of-principle normal volunteer measurements were taken to demonstrate the ability to collect continuous in vivo breast measurements. This wearable probe is a first of its kind tool to explore prognostic hemodynamic changes during chemotherapy in breast cancer patients.
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Affiliation(s)
- Fei Teng
- Boston University, Department of Electrical and Computer Engineering and Photonics Center, 8 Saint Mary’s Street, Boston, Massachusetts 02215, United States
| | - Timothy Cormier
- Boston University, Fraunhofer Center for Manufacturing Innovation, 15 Saint Mary’s Street, Brookline, Massachusetts 02446, United States
| | - Alexis Sauer-Budge
- Boston University, Fraunhofer Center for Manufacturing Innovation, 15 Saint Mary’s Street, Brookline, Massachusetts 02446, United States
| | - Rachita Chaudhury
- Boston University, Department of Biomedical Engineering, 44 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Vivian Pera
- Boston University, Department of Biomedical Engineering, 44 Cummington Mall, Boston, Massachusetts 02215, United States
| | - Raeef Istfan
- Boston University, Department of Biomedical Engineering, 44 Cummington Mall, Boston, Massachusetts 02215, United States
| | - David Chargin
- Boston University, Fraunhofer Center for Manufacturing Innovation, 15 Saint Mary’s Street, Brookline, Massachusetts 02446, United States
| | - Samuel Brookfield
- Boston University, Fraunhofer Center for Manufacturing Innovation, 15 Saint Mary’s Street, Brookline, Massachusetts 02446, United States
| | - Naomi Yu Ko
- Boston Medical Center, Section of Hematology and Oncology, Women’s Health Unit, 801 Massachusetts Avenue, First Floor, Boston, Massachusetts 02118, United States
| | - Darren M. Roblyer
- Boston University, Department of Biomedical Engineering, 44 Cummington Mall, Boston, Massachusetts 02215, United States
- Address all correspondence to: Darren M. Roblyer, E-mail:
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221
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Njoum H, Kyriacou PA. Photoplethysmography for an independent measure of pulsatile pressure under controlled flow conditions. Physiol Meas 2016; 38:87-100. [DOI: 10.1088/1361-6579/38/2/87] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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222
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Turton KB, Esnault S, Delain LP, Mosher DF. Merging Absolute and Relative Quantitative PCR Data to Quantify STAT3 Splice Variant Transcripts. J Vis Exp 2016. [PMID: 27768061 PMCID: PMC5092172 DOI: 10.3791/54473] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Human signal transducer and activator of transcription 3 (STAT3) is one of many genes containing a tandem splicing site. Alternative donor splice sites 3 nucleotides apart result in either the inclusion (S) or exclusion (ΔS) of a single residue, Serine-701. Further downstream, splicing at a pair of alternative acceptor splice sites result in transcripts encoding either the 55 terminal residues of the transactivation domain (α) or a truncated transactivation domain with 7 unique residues (β). As outlined in this manuscript, measuring the proportions of STAT3's four spliced transcripts (Sα, Sβ, ΔSα and ΔSβ) was possible using absolute qPCR (quantitative polymerase chain reaction). The protocol therefore distinguishes and measures highly similar splice variants. Absolute qPCR makes use of calibrator plasmids and thus specificity of detection is not compromised for the sake of efficiency. The protocol necessitates primer validation and optimization of cycling parameters. A combination of absolute qPCR and efficiency-dependent relative qPCR of total STAT3 transcripts allowed a description of the fluctuations of STAT3 splice variants' levels in eosinophils treated with cytokines. The protocol also provided evidence of a co-splicing interdependence between the two STAT3 splicing events. The strategy based on a combination of the two qPCR techniques should be readily adaptable to investigation of co-splicing at other tandem splicing sites.
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Affiliation(s)
- Keren B Turton
- Department of Biomolecular Chemistry, University of Wisconsin-Madison;
| | | | | | - Deane F Mosher
- Department of Biomolecular Chemistry, University of Wisconsin-Madison; Department of Medicine, University of Wisconsin-Madison
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223
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Liu J, Yan BPY, Dai WX, Ding XR, Zhang YT, Zhao N. Multi-wavelength photoplethysmography method for skin arterial pulse extraction. BIOMEDICAL OPTICS EXPRESS 2016; 7:4313-4326. [PMID: 27867733 PMCID: PMC5102532 DOI: 10.1364/boe.7.004313] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/19/2016] [Accepted: 09/19/2016] [Indexed: 05/02/2023]
Abstract
In this work, we present a multi-wavelength (MW) PPG method exploiting the wavelength dependence of light penetration in skin tissue to provide depth resolution of skin blood pulsation. The MW PPG system requires two to three light sources in different wavelengths and extracts the arterial blood pulsation through a multi-wavelength multi-layer light-skin interaction model, which removes the capillary pulsation (determined from the short-wavelength PPG signal) from the long-wavelength PPG signal using absorption weighting factors that are quasi-analytically calibrated. The extracted pulsations are used to calculate blood pressure (BP) through pulse transit time (PTT), and the results are compared with those obtained from the single wavelength PPG method. The comparative study is clinically performed on 20 subjects including 10 patients diagnosed with cardiovascular diseases and 10 healthy subjects. The result demonstrates that the MW PPG method significantly improves the measurement accuracy of systolic BP (SBP), reducing the mean absolute difference between the reference and the estimated SBP values from 5.7 mmHg (for single-wavelength PPG) to 2.9 mmHg (for three-wavelength PPG).
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Affiliation(s)
- Jing Liu
- Electronic Engineering Department, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Bryan Ping-Yen Yan
- Division of Cardiology, Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China
| | - Wen-Xuan Dai
- Electronic Engineering Department, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Xiao-Rong Ding
- Electronic Engineering Department, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
| | - Yuan-Ting Zhang
- Electronic Engineering Department, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China; China Key Lab for Health Informatics of Chinese Academy of Sciences, Shenzhen, Guangdong, China;
| | - Ni Zhao
- Electronic Engineering Department, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China;
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Sakota D, Nagaoka E, Maruyama O. Hyperspectral imaging of vascular anastomosis associated with blood flow and hemoglobin concentration. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2015:4246-9. [PMID: 26737232 DOI: 10.1109/embc.2015.7319332] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The feasibility of optical non-invasive evaluation of the graft function of vascular anastomosis was investigated in vitro using hyperspectral imaging (HSI) in the wavelength range from 500 to 600 nm. A Y-shaped vessel was made using porcine carotid arteries having an inner diameter of 3.5 to 4 mm. The graft vessel was anastomosed at a 45° angle with 8-0 polypropylene suture. Fresh porcine blood at an oxygen saturation of 100% was circulated in the specially designed circuit loop and through the graft or main vessel. The vessels were then irradiated with light, and the reflected light was captured with an HSI camera. The attenuation (A) image at each wavelength (λ) was obtained and the spectral A(λ) image was created. The spectral A(λ) image showed graft patency and changes in the hemoglobin concentration. The A(λ) decreased as the flow rate increased due to the orientation of the red blood cells. The experimental results indicated that imaging of the hemoglobin concentration without distortion from blood flow is possible using two wavelengths: 625 and 770 nm. This method is able to distinguish between the blood flow and changes in hemoglobin concentration. The multispectral and hyperspectral imaging method is useful for the non-invasive evaluation of graft function.
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225
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Si J, Zhang X, Li Y, Zhang Y, Zuo N, Jiang T. Correlation between electrical and hemodynamic responses during visual stimulation with graded contrasts. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:091315. [PMID: 27494269 DOI: 10.1117/1.jbo.21.9.091315] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 07/13/2016] [Indexed: 06/06/2023]
Abstract
Brain functional activity involves complex cellular, metabolic, and vascular chain reactions, making it difficult to comprehend. Electroencephalography (EEG) and functional near infrared spectroscopy (fNIRS) have been combined into a multimodal neuroimaging method that captures both electrophysiological and hemodynamic information to explore the spatiotemporal characteristics of brain activity. Because of the significance of visually evoked functional activity in clinical applications, numerous studies have explored the amplitude of the visual evoked potential (VEP) to clarify its relationship with the hemodynamic response. However, relatively few studies have investigated the influence of latency, which has been frequently used to diagnose visual diseases, on the hemodynamic response. Moreover, because the latency and the amplitude of VEPs have different roles in coding visual information, investigating the relationship between latency and the hemodynamic response should be helpful. In this study, checkerboard reversal tasks with graded contrasts were used to evoke visual functional activity. Both EEG and fNIRS were employed to investigate the relationship between neuronal electrophysiological activities and the hemodynamic responses. The VEP amplitudes were linearly correlated with the hemodynamic response, but the VEP latency showed a negative linear correlation with the hemodynamic response.
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Affiliation(s)
- Juanning Si
- Chinese Academy of Sciences, Brainnetome Center, Institute of Automation, Beijing 100190, ChinabChinese Academy of Sciences, National Laboratory of Pattern Recognition, Institute of Automation, Beijing 100190, China
| | - Xin Zhang
- Chinese Academy of Sciences, Brainnetome Center, Institute of Automation, Beijing 100190, ChinabChinese Academy of Sciences, National Laboratory of Pattern Recognition, Institute of Automation, Beijing 100190, China
| | - Yuejun Li
- University of Electronic Science and Technology of China, Key Laboratory for NeuroInformation of the Ministry of Education, School of Life Science and Technology, Chengdu 625014, China
| | - Yujin Zhang
- Chinese Academy of Sciences, Brainnetome Center, Institute of Automation, Beijing 100190, ChinabChinese Academy of Sciences, National Laboratory of Pattern Recognition, Institute of Automation, Beijing 100190, China
| | - Nianming Zuo
- Chinese Academy of Sciences, Brainnetome Center, Institute of Automation, Beijing 100190, ChinabChinese Academy of Sciences, National Laboratory of Pattern Recognition, Institute of Automation, Beijing 100190, China
| | - Tianzi Jiang
- Chinese Academy of Sciences, Brainnetome Center, Institute of Automation, Beijing 100190, ChinabChinese Academy of Sciences, National Laboratory of Pattern Recognition, Institute of Automation, Beijing 100190, ChinacUniversity of Electronic Science and Te
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226
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Interplay between up-regulation of cytochrome-c-oxidase and hemoglobin oxygenation induced by near-infrared laser. Sci Rep 2016; 6:30540. [PMID: 27484673 PMCID: PMC4971496 DOI: 10.1038/srep30540] [Citation(s) in RCA: 130] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 07/06/2016] [Indexed: 01/11/2023] Open
Abstract
Photobiomodulation, also known as low-level laser/light therapy (LLLT), refers to the use of red-to-near-infrared light to stimulate cellular functions for physiological or clinical benefits. The mechanism of LLLT is assumed to rely on photon absorption by cytochrome c oxidase (CCO), the terminal enzyme in the mitochondrial respiratory chain that catalyzes the reduction of oxygen for energy metabolism. In this study, we used broadband near-infrared spectroscopy (NIRS) to measure the LLLT-induced changes in CCO and hemoglobin concentrations in human forearms in vivo. Eleven healthy participants were administered with 1064-nm laser and placebo treatments on their right forearms. The spectroscopic data were analyzed and fitted with wavelength-dependent, modified Beer-Lambert Law. We found that LLLT induced significant increases of CCO concentration (Δ[CCO]) and oxygenated hemoglobin concentration (Δ[HbO]) on the treated site as the laser energy dose accumulated over time. A strong linear interplay between Δ[CCO] and Δ[HbO] was observed for the first time during LLLT, indicating a hemodynamic response of oxygen supply and blood volume closely coupled to the up-regulation of CCO induced by photobiomodulation. These results demonstrate the tremendous potential of broadband NIRS as a non-invasive, in vivo means to study mechanisms of photobiomodulation and perform treatment evaluations of LLLT.
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227
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Bhatt M, Ayyalasomayajula KR, Yalavarthy PK. Generalized Beer-Lambert model for near-infrared light propagation in thick biological tissues. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:76012. [PMID: 27436050 DOI: 10.1117/1.jbo.21.7.076012] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 06/20/2016] [Indexed: 05/08/2023]
Abstract
The attenuation of near-infrared (NIR) light intensity as it propagates in a turbid medium like biological tissue is described by modified the Beer–Lambert law (MBLL). The MBLL is generally used to quantify the changes in tissue chromophore concentrations for NIR spectroscopic data analysis. Even though MBLL is effective in terms of providing qualitative comparison, it suffers from its applicability across tissue types and tissue dimensions. In this work, we introduce Lambert-W function-based modeling for light propagation in biological tissues, which is a generalized version of the Beer–Lambert model. The proposed modeling provides parametrization of tissue properties, which includes two attenuation coefficients μ0 and η. We validated our model against the Monte Carlo simulation, which is the gold standard for modeling NIR light propagation in biological tissue. We included numerous human and animal tissues to validate the proposed empirical model, including an inhomogeneous adult human head model. The proposed model, which has a closed form (analytical), is first of its kind in providing accurate modeling of NIR light propagation in biological tissues.
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Affiliation(s)
- Manish Bhatt
- Indian Institute of Science, Medical Imaging Group, Department of Computational and Data Sciences, C V Raman Avenue, Bengaluru 560012, India
| | | | - Phaneendra K Yalavarthy
- Indian Institute of Science, Medical Imaging Group, Department of Computational and Data Sciences, C V Raman Avenue, Bengaluru 560012, India
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228
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Ahn S, Nguyen T, Jang H, Kim JG, Jun SC. Exploring Neuro-Physiological Correlates of Drivers' Mental Fatigue Caused by Sleep Deprivation Using Simultaneous EEG, ECG, and fNIRS Data. Front Hum Neurosci 2016; 10:219. [PMID: 27242483 PMCID: PMC4865510 DOI: 10.3389/fnhum.2016.00219] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 04/27/2016] [Indexed: 11/18/2022] Open
Abstract
Investigations of the neuro-physiological correlates of mental loads, or states, have attracted significant attention recently, as it is particularly important to evaluate mental fatigue in drivers operating a motor vehicle. In this research, we collected multimodal EEG/ECG/EOG and fNIRS data simultaneously to develop algorithms to explore neuro-physiological correlates of drivers' mental states. Each subject performed simulated driving under two different conditions (well-rested and sleep-deprived) on different days. During the experiment, we used 68 electrodes for EEG/ECG/EOG and 8 channels for fNIRS recordings. We extracted the prominent features of each modality to distinguish between the well-rested and sleep-deprived conditions, and all multimodal features, except EOG, were combined to quantify mental fatigue during driving. Finally, a novel driving condition level (DCL) was proposed that distinguished clearly between the features of well-rested and sleep-deprived conditions. This proposed DCL measure may be applicable to real-time monitoring of the mental states of vehicle drivers. Further, the combination of methods based on each classifier yielded substantial improvements in the classification accuracy between these two conditions.
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Affiliation(s)
- Sangtae Ahn
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology Gwangju, South Korea
| | - Thien Nguyen
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology Gwangju, South Korea
| | - Hyojung Jang
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology Gwangju, South Korea
| | - Jae G Kim
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology Gwangju, South Korea
| | - Sung C Jun
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology Gwangju, South Korea
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229
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Hong KS, Naseer N. Reduction of Delay in Detecting Initial Dips from Functional Near-Infrared Spectroscopy Signals Using Vector-Based Phase Analysis. Int J Neural Syst 2016; 26:1650012. [DOI: 10.1142/s012906571650012x] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
In this paper, we present a systematic method to reduce the time lag in detecting initial dips using a vector-based phase diagram and an autoregressive moving average with exogenous signals (ARMAX) model-based [Formula: see text]-step-ahead prediction algorithm. With functional near-infrared spectroscopy (fNIRS), signals related to mental arithmetic and right-hand clenching are acquired from the prefrontal and left primary motor cortices, respectively. The interrelationship between oxygenated hemoglobin, deoxygenated hemoglobin, total hemoglobin and cerebral oxygen exchange are related to initial dips. Specifically, a threshold value from the resting state hemodynamics is incorporated, as a decision criterion, into the vector-based phase diagram to determine the occurrence of initial dips. To further reduce the time lag, a [Formula: see text]-step-ahead prediction method is applied to predict the occurrence of the dips. A combination of the threshold criterion and the prediction method resulted in the delay time of about 0.9[Formula: see text]s. The results demonstrate that rapid detection of initial dip is possible and therefore can be used for real-time brain–computer interfacing.
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Affiliation(s)
- Keum-Shik Hong
- School of Mechanical Engineering, Pusan National University; 2 Busandaehak-ro, Geumjeong-gu, Busan 46241, Korea
| | - Noman Naseer
- Department of Cogno-Mechatronics Engineering, Pusan National University; 2 Busandaehak-ro, Geumjeong-gu, Busan 46241, Korea
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230
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Carius D, Andrä C, Clauß M, Ragert P, Bunk M, Mehnert J. Hemodynamic Response Alteration As a Function of Task Complexity and Expertise-An fNIRS Study in Jugglers. Front Hum Neurosci 2016; 10:126. [PMID: 27064925 PMCID: PMC4811870 DOI: 10.3389/fnhum.2016.00126] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 03/08/2016] [Indexed: 12/04/2022] Open
Abstract
Detailed knowledge about online brain processing during the execution of complex motor tasks with a high motion range still remains elusive. The aim of the present study was to investigate the hemodynamic responses within sensorimotor networks as well as in visual motion area during the execution of a complex visuomotor task such as juggling. More specifically, we were interested in how far the hemodynamic response as measured with functional near infrared spectroscopy (fNIRS) adapts as a function of task complexity and the level of the juggling expertise. We asked expert jugglers to perform different juggling tasks with different levels of complexity such as a 2-ball juggling, 3- and 5-ball juggling cascades. We here demonstrate that expert jugglers show an altered neurovascular response with increasing task complexity, since a 5-ball juggling cascade showed enhanced hemodynamic responses for oxygenated hemoglobin as compared to less complex tasks such as a 3- or 2-ball juggling pattern. Moreover, correlations between the hemodynamic response and the level of the juggling expertise during the 5-ball juggling cascade, acquired by cinematographic video analysis, revealed only a non-significant trend in primary motor cortex, indicating that a higher level of expertise might be associated with lower hemodynamic responses.
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Affiliation(s)
- Daniel Carius
- Institute for General Kinesiology and Exercise Science, University of LeipzigLeipzig, Germany; Department of Sport Science, Martin Luther University of Halle-WittenbergHalle, Germany
| | - Christian Andrä
- Department of School Sport, Institute of Sport Psychology and Sport Pedagogy, University of Leipzig Leipzig, Germany
| | - Martina Clauß
- Institute of General Kinesiology and Athletics Training, University of Leipzig Leipzig, Germany
| | - Patrick Ragert
- Institute for General Kinesiology and Exercise Science, University of LeipzigLeipzig, Germany; Department of Neurology, Max Planck Institute for Human Cognitive and Brain SciencesLeipzig, Germany
| | - Michael Bunk
- Institute for Applied Training Science Leipzig, Germany
| | - Jan Mehnert
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain SciencesLeipzig, Germany; Day Clinic for Cognitive Neurology, University Hospital LeipzigLeipzig, Germany
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231
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van de Rijt LPH, van Opstal AJ, Mylanus EAM, Straatman LV, Hu HY, Snik AFM, van Wanrooij MM. Temporal Cortex Activation to Audiovisual Speech in Normal-Hearing and Cochlear Implant Users Measured with Functional Near-Infrared Spectroscopy. Front Hum Neurosci 2016; 10:48. [PMID: 26903848 PMCID: PMC4750083 DOI: 10.3389/fnhum.2016.00048] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/29/2016] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Speech understanding may rely not only on auditory, but also on visual information. Non-invasive functional neuroimaging techniques can expose the neural processes underlying the integration of multisensory processes required for speech understanding in humans. Nevertheless, noise (from functional MRI, fMRI) limits the usefulness in auditory experiments, and electromagnetic artifacts caused by electronic implants worn by subjects can severely distort the scans (EEG, fMRI). Therefore, we assessed audio-visual activation of temporal cortex with a silent, optical neuroimaging technique: functional near-infrared spectroscopy (fNIRS). METHODS We studied temporal cortical activation as represented by concentration changes of oxy- and deoxy-hemoglobin in four, easy-to-apply fNIRS optical channels of 33 normal-hearing adult subjects and five post-lingually deaf cochlear implant (CI) users in response to supra-threshold unisensory auditory and visual, as well as to congruent auditory-visual speech stimuli. RESULTS Activation effects were not visible from single fNIRS channels. However, by discounting physiological noise through reference channel subtraction (RCS), auditory, visual and audiovisual (AV) speech stimuli evoked concentration changes for all sensory modalities in both cohorts (p < 0.001). Auditory stimulation evoked larger concentration changes than visual stimuli (p < 0.001). A saturation effect was observed for the AV condition. CONCLUSIONS Physiological, systemic noise can be removed from fNIRS signals by RCS. The observed multisensory enhancement of an auditory cortical channel can be plausibly described by a simple addition of the auditory and visual signals with saturation.
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Affiliation(s)
- Luuk P H van de Rijt
- Department of Otorhinolaryngology, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen Medical CentreNijmegen, Netherlands; Department of Biophysics, Donders Institute for Brain, Cognition, and Behaviour, Radboud University NijmegenNijmegen, Netherlands
| | - A John van Opstal
- Department of Biophysics, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen Nijmegen, Netherlands
| | - Emmanuel A M Mylanus
- Department of Otorhinolaryngology, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen Medical Centre Nijmegen, Netherlands
| | - Louise V Straatman
- Department of Otorhinolaryngology, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen Medical Centre Nijmegen, Netherlands
| | - Hai Yin Hu
- Department of Biophysics, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen Nijmegen, Netherlands
| | - Ad F M Snik
- Department of Otorhinolaryngology, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen Medical Centre Nijmegen, Netherlands
| | - Marc M van Wanrooij
- Department of Otorhinolaryngology, Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen Medical CentreNijmegen, Netherlands; Department of Biophysics, Donders Institute for Brain, Cognition, and Behaviour, Radboud University NijmegenNijmegen, Netherlands
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232
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Hartwig V, Marinelli M, Rocco F, L’Abbate A. Assessment of Microvascular Function Using Near-Infrared Spectroscopic 2D Imaging of Whole Hand Combined with Vascular Occlusion Test. J Med Biol Eng 2016. [DOI: 10.1007/s40846-016-0114-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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233
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Quantifying movement intentions with multimodal neuroimaging for functional electrical stimulation-based rehabilitation. Neuroreport 2016; 27:61-6. [PMID: 26656935 DOI: 10.1097/wnr.0000000000000480] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Functional electrical stimulation (FES) is a common rehabilitation method for the purpose of recovery of paralyzed muscle by means of sequential electrical stimulation. Reports indicate that active participation by the patient, as opposed to simple stimulation, leads to improved recovery when using FES and other rehabilitation techniques. In this paper, we investigate the neurophysiological effect of an active participant's intention in the FES rehabilitation task. To observe the difference in brain signal between intentional and involuntary movement during FES, electroencephalography and near-infrared spectroscopy were simultaneously measured in the motor cortex area. The result showed that the presence of intention affects the activation of the brain significantly in both hemodynamic responses (near-infrared spectroscopy) and electrical (electroencephalography) patterns, and the accuracy of classification between passive and active mental states during FES was 85.3%. Our result implies the possibility to quantify motivation, or active participation, during rehabilitation, which has not been considered a measurable value in the rehabilitation field.
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234
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Byun JI, Jung KY, Lee GT, Kim CK, Kim BM. Spontaneous Low-Frequency Cerebral Hemodynamics Oscillations in Restless Legs Syndrome with Periodic Limb Movements During Sleep: A Near-Infrared Spectroscopy Study. J Clin Neurol 2016; 12:107-14. [PMID: 26754783 PMCID: PMC4712275 DOI: 10.3988/jcn.2016.12.1.107] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 07/20/2015] [Accepted: 07/21/2015] [Indexed: 11/24/2022] Open
Abstract
Background and Purpose Periodic limb movements (PLM) during sleep (PLMS) are associated with cortical and cardiovascular activation. Changes in cerebral hemodynamics caused by cortical activity can be measured using near-infrared spectroscopy (NIRS). We investigated oscillatory components of cerebral hemodynamics during PLM and different sleep stages in restless legs syndrome (RLS) patients with PLMS. Methods Four female RLS patients with PLMS, and four age- and sex-matched normal controls were included. PLM and sleep stages were scored using polysomnography, while the spontaneous cerebral hemodynamics was measured by NIRS. The phase and amplitude of the cerebral oxyhemoglobin concentration [HbO] and the deoxyhemoglobin concentration [Hb] low-frequency oscillations (LFOs) were evaluated during each sleep stage [waking, light sleep (LS; stages N1 and N2), slow-wave sleep (stage N3), and rapid eye movement (REM) sleep]. In RLS patients with PLMS, the cerebral hemodynamics during LS was divided into LS with and without PLM. Results The cerebral hemodynamics activity varied among the different sleep stages. There were changes in phase differences between [HbO] and [Hb] LFOs during the different sleep stages in the normal controls but not in the RLS patients with PLMS. The [HbO] and [Hb] LFO amplitudes were higher in the patient group than in controls during both LS with PLM and REM sleep. Conclusions The present study has demonstrated the presence of cerebral hemodynamics disturbances in RLS patients with PLMS, which may contribute to an increased risk of cerebrovascular events.
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Affiliation(s)
- Jung Ick Byun
- Department of Neurology, Seoul National University Hospital, Seoul, Korea
| | - Ki Young Jung
- Department of Neurology, Seoul National University Hospital, Seoul, Korea.,Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea.
| | - Gwan Taek Lee
- Department of Neurology, College of Medicine, Korea University, Seoul, Korea
| | - Choong Ki Kim
- Department of Biomedical Engineering, Korea University, Seoul, Korea
| | - Beop Min Kim
- Department of Biomedical Engineering, Korea University, Seoul, Korea.
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235
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Yao P, Guo W, Sheng X, Zhang D, Zhu X. A portable multi-channel wireless NIRS device for muscle activity real-time monitoring. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2015; 2014:3719-22. [PMID: 25570799 DOI: 10.1109/embc.2014.6944431] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Near-infrared spectroscopy (NIRS) is a relative new technology in monitoring muscle oxygenation and hemo-dynamics. This paper presents a portable multi-channel wireless NIRS device for real-time monitoring of muscle activity. The NIRS sensor is designed miniaturized and modularized, to make multi-site monitoring convenient. Wireless communication is applied to data transmission avoiding of cumbersome wires and the whole system is highly integrated. Special care is taken to eliminate motion artifact when designing the NIRS sensor and attaching it to human skin. Besides, the system is designed with high sampling rate so as to monitor rapid oxygenation changes during muscle activities. Dark noise and long-term drift tests have been carried out, and the result indicates the device has a good performance of accuracy and stability. In vivo experiments including arterial occlusion and isometric voluntary forearm muscle contraction were performed, demonstrating the system has the ability to monitor muscle oxygenation parameters effectively even in exercise.
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236
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Venclove S, Daktariunas A, Ruksenas O. Functional near-infrared spectroscopy: a continuous wave type based system for human frontal lobe studies. EXCLI JOURNAL 2015; 14:1145-52. [PMID: 26869869 PMCID: PMC4746999 DOI: 10.17179/excli2015-614] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 10/20/2015] [Indexed: 11/22/2022]
Abstract
Functional Near-Infrared Spectroscopy (fNIRS) is an optical non-invasive brain monitoring technology that registers changes in hemodynamic responses within the cortex of the human brain. Over the last decades fNIRS became a promising method in neurosciences: it is non-invasive, portable and can be used in long term studies. All these advantages make it suitable for educational purposes as well. This paper presents basic methodological concept of optical engineering principles and suitable applications of fNIRS. We represent a continuous wave (cw-fNIRS) system that could be used for frontal lobe studies in human adults or as demonstration equipment for physiological measurements. This system has been validated by comparing it with commercial device fNIR400 from Biopac. A comparison of geometry, data and statistical analyses suggests similar hemodynamic responses recorded by both devices. Our study suggests that this system can be used for further development and as a guideline for researchers to develop a specific tool for applications in human brain studies.
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Affiliation(s)
- Sigita Venclove
- Department of Neurobiology and Biophysics, Faculty of Natural Sciences, Vilnius University, Ciurlionio 21/27, LT-03101 Vilnius, Lithuania
| | - Algis Daktariunas
- Department of Neurobiology and Biophysics, Faculty of Natural Sciences, Vilnius University, Ciurlionio 21/27, LT-03101 Vilnius, Lithuania
| | - Osvaldas Ruksenas
- Department of Neurobiology and Biophysics, Faculty of Natural Sciences, Vilnius University, Ciurlionio 21/27, LT-03101 Vilnius, Lithuania
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237
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FC-NIRS: A Functional Connectivity Analysis Tool for Near-Infrared Spectroscopy Data. BIOMED RESEARCH INTERNATIONAL 2015; 2015:248724. [PMID: 26539473 PMCID: PMC4619753 DOI: 10.1155/2015/248724] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 06/18/2015] [Indexed: 11/17/2022]
Abstract
Functional near-infrared spectroscopy (fNIRS), a promising noninvasive imaging technique, has recently become an increasingly popular tool in resting-state brain functional connectivity (FC) studies. However, the corresponding software packages for FC analysis are still lacking. To facilitate fNIRS-based human functional connectome studies, we developed a MATLAB software package called “functional connectivity analysis tool for near-infrared spectroscopy data” (FC-NIRS). This package includes the main functions of fNIRS data preprocessing, quality control, FC calculation, and network analysis. Because this software has a friendly graphical user interface (GUI), FC-NIRS allows researchers to perform data analysis in an easy, flexible, and quick way. Furthermore, FC-NIRS can accomplish batch processing during data processing and analysis, thereby greatly reducing the time cost of addressing a large number of datasets. Extensive experimental results using real human brain imaging confirm the viability of the toolbox. This novel toolbox is expected to substantially facilitate fNIRS-data-based human functional connectome studies.
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238
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Hocke LM, Cayetano K, Tong Y, Frederick B. Optimized multimodal functional magnetic resonance imaging/near-infrared spectroscopy probe for ultrahigh-resolution mapping. NEUROPHOTONICS 2015; 2:045004. [PMID: 26668816 PMCID: PMC4675318 DOI: 10.1117/1.nph.2.4.045004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 10/29/2015] [Indexed: 06/05/2023]
Abstract
Functional near-infrared spectroscopy (fNIRS) is an increasingly important noninvasive method in neuroscience due to its high temporal resolution and ability to independently measure oxy- and deoxy-hemoglobin. However, the relatively low spatial resolution of fNIRS makes it difficult to relate this signal to underlying anatomy. Simultaneous functional magnetic resonance imaging (fMRI) can complement fNIRS with superior spatial resolution and the ability to image the entire brain, providing additional information to improve fNIRS localization. However, current simultaneous fMRI/fNIRS acquisition methods are not optimal, due to the poor physical compatibility of existing MR coils and fNIRS optodes. Here, we present a technique to manufacture a true multimodal fMRI/fNIRS probe in which both modalities can be used with maximal sensitivity. To achieve this, we designed custom MR coils with integral fNIRS optodes using three-dimensional printing. This multimodal probe can be used to optimize spatial ([Formula: see text]) and temporal resolution (2.5 Hz) of fMRI, and it provides maximal MRI sensitivity, while allowing for high flexibility in the location and density of fNIRS optodes within the area of interest. Phantom and human data are shown to confirm the improvement in sensitivity in both modalities. This probe shows promise for addressing fundamental questions of the relation of fNIRS to physiology.
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Affiliation(s)
- Lia Maria Hocke
- McLean Hospital, McLean Imaging Center, 115 Mill Street, Belmont, Massachusetts 02478, United States
- Tufts University, Department of Biomedical Engineering, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - Kenroy Cayetano
- McLean Hospital, McLean Imaging Center, 115 Mill Street, Belmont, Massachusetts 02478, United States
- Harvard Medical School, Department of Psychiatry, 25 Shattuck Street, Boston, Massachusetts 02115, United States
| | - Yunjie Tong
- McLean Hospital, McLean Imaging Center, 115 Mill Street, Belmont, Massachusetts 02478, United States
- Harvard Medical School, Department of Psychiatry, 25 Shattuck Street, Boston, Massachusetts 02115, United States
| | - Blaise Frederick
- McLean Hospital, McLean Imaging Center, 115 Mill Street, Belmont, Massachusetts 02478, United States
- Harvard Medical School, Department of Psychiatry, 25 Shattuck Street, Boston, Massachusetts 02115, United States
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239
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Sun Y, Thakor N. Photoplethysmography Revisited: From Contact to Noncontact, From Point to Imaging. IEEE Trans Biomed Eng 2015; 63:463-77. [PMID: 26390439 DOI: 10.1109/tbme.2015.2476337] [Citation(s) in RCA: 182] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Photoplethysmography (PPG) is a noninvasive optical technique for detecting microvascular blood volume changes in tissues. Its ease of use, low cost and convenience make it an attractive area of research in the biomedical and clinical communities. Nevertheless, its single spot monitoring and the need to apply a PPG sensor directly to the skin limit its practicality in situations such as perfusion mapping and healing assessments or when free movement is required. The introduction of fast digital cameras into clinical imaging monitoring and diagnosis systems, the desire to reduce the physical restrictions, and the possible new insights that might come from perfusion imaging and mapping inspired the evolution of the conventional PPG technology to imaging PPG (IPPG). IPPG is a noncontact method that can detect heart-generated pulse waves by means of peripheral blood perfusion measurements. Since its inception, IPPG has attracted significant public interest and provided opportunities to improve personal healthcare. This study presents an overview of the wide range of IPPG systems currently being introduced along with examples of their application in various physiological assessments. We believe that the widespread acceptance of IPPG is happening, and it will dramatically accelerate the promotion of this healthcare model in the near future.
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240
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Lu CF, Liu YC, Yang YR, Wu YT, Wang RY. Maintaining Gait Performance by Cortical Activation during Dual-Task Interference: A Functional Near-Infrared Spectroscopy Study. PLoS One 2015; 10:e0129390. [PMID: 26079605 PMCID: PMC4469417 DOI: 10.1371/journal.pone.0129390] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 05/07/2015] [Indexed: 11/21/2022] Open
Abstract
In daily life, mobility requires walking while performing a cognitive or upper-extremity motor task. Although previous studies have evaluated the effects of dual tasks on gait performance, few studies have evaluated cortical activation and its association with gait disturbance during dual tasks. In this study, we simultaneously assessed gait performance and cerebral oxygenation in the bilateral prefrontal cortices (PFC), premotor cortices (PMC), and supplemental motor areas (SMA), using functional near-infrared spectroscopy, in 17 young adults performing dual tasks. Each participant was evaluated while performing normal-pace walking (NW), walking while performing a cognitive task (WCT), and walking while performing a motor task (WMT). Our results indicated that the left PFC exhibited the strongest and most sustained activation during WCT, and that NW and WMT were associated with minor increases in oxygenation levels during their initial phases. We observed increased activation in channels in the SMA and PMC during WCT and WMT. Gait data indicated that WCT and WMT both caused reductions in walking speed, but these reductions resulted from differing alterations in gait properties. WCT was associated with significant changes in cadence, stride time, and stride length, whereas WMT was associated with reductions in stride length only. During dual-task activities, increased activation of the PMC and SMA correlated with declines in gait performance, indicating a control mechanism for maintaining gait performance during dual tasks. Thus, the regulatory effects of cortical activation on gait behavior enable a second task to be performed while walking.
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Affiliation(s)
- Chia-Feng Lu
- Translational Imaging Research Center, College of Medicine, Taipei Medical University, Taipei, Taiwan, ROC
- Department of Radiology, School of Medicine, Taipei Medical University, Taipei, Taiwan, ROC
- Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Yan-Ci Liu
- Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan, ROC
| | - Yea-Ru Yang
- Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan, ROC
- Taipei City Hospital, Taipei, Taiwan, ROC
| | - Yu-Te Wu
- Institute of Biophotonics, National Yang-Ming University, Taipei, Taiwan, ROC
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan, ROC
- Brain Research Center, National Yang-Ming University, Taipei, Taiwan, ROC
- * E-mail: (Y-TW); (R-YW)
| | - Ray-Yau Wang
- Department of Physical Therapy and Assistive Technology, National Yang-Ming University, Taipei, Taiwan, ROC
- * E-mail: (Y-TW); (R-YW)
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241
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Bhutta MR, Hong MJ, Kim YH, Hong KS. Single-trial lie detection using a combined fNIRS-polygraph system. Front Psychol 2015; 6:709. [PMID: 26082733 PMCID: PMC4451253 DOI: 10.3389/fpsyg.2015.00709] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 05/13/2015] [Indexed: 11/13/2022] Open
Abstract
Deception is a human behavior that many people experience in daily life. It involves complex neuronal activities in addition to several physiological changes in the body. A polygraph, which can measure some of the physiological responses from the body, has been widely employed in lie-detection. Many researchers, however, believe that lie detection can become more precise if the neuronal changes that occur in the process of deception can be isolated and measured. In this study, we combine both measures (i.e., physiological and neuronal changes) for enhanced lie-detection. Specifically, to investigate the deception-related hemodynamic response, functional near-infrared spectroscopy (fNIRS) is applied at the prefrontal cortex besides a commercially available polygraph system. A mock crime scenario with a single-trial stimulus is set up as a deception protocol. The acquired data are classified into “true” and “lie” classes based on the fNIRS-based hemoglobin-concentration changes and polygraph-based physiological signal changes. Linear discriminant analysis is utilized as a classifier. The results indicate that the combined fNIRS-polygraph system delivers much higher classification accuracy than that of a singular system. This study demonstrates a plausible solution toward single-trial lie-detection by combining fNIRS and the polygraph.
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Affiliation(s)
- M Raheel Bhutta
- Department of Cogno-Mechatronics Engineering, Pusan National University Busan, South Korea
| | | | - Yun-Hee Kim
- Department of Physical and Rehabilitation Medicine, Center for Prevention and Rehabilitation, Heart Vascular and Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Samsung Advanced Institute of Health Sciences & Technology, Sungkyunkwan University Seoul, South Korea
| | - Keum-Shik Hong
- Department of Cogno-Mechatronics Engineering, Pusan National University Busan, South Korea ; School of Mechanical Engineering, Pusan National University Busan, South Korea
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242
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Li L, Zeng L, Lin ZJ, Cazzell M, Liu H. Tutorial on use of intraclass correlation coefficients for assessing intertest reliability and its application in functional near-infrared spectroscopy-based brain imaging. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:50801. [PMID: 25992845 DOI: 10.1117/1.jbo.20.5.050801] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 04/27/2015] [Indexed: 05/23/2023]
Abstract
Test-retest reliability of neuroimaging measurements is an important concern in the investigation of cognitive functions in the human brain. To date, intraclass correlation coefficients (ICCs), originally used in interrater reliability studies in behavioral sciences, have become commonly used metrics in reliability studies on neuroimaging and functional near-infrared spectroscopy (fNIRS). However, as there are six popular forms of ICC, the adequateness of the comprehensive understanding of ICCs will affect how one may appropriately select, use, and interpret ICCs toward a reliability study. We first offer a brief review and tutorial on the statistical rationale of ICCs, including their underlying analysis of variance models and technical definitions, in the context of assessment on intertest reliability. Second, we provide general guidelines on the selection and interpretation of ICCs. Third, we illustrate the proposed approach by using an actual research study to assess interest reliability of fNIRS-based, volumetric diffuse optical tomography of brain activities stimulated by a risk decision-making protocol. Last, special issues that may arise in reliability assessment using ICCs are discussed and solutions are suggested.
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Affiliation(s)
- Lin Li
- Joint Graduate Program between University of Texas at Arlington and University of Texas Southwestern Medical Center, University of Texas at Arlington, Department of Bioengineering, Texas 76019, United States
| | - Li Zeng
- University of Texas at Arlington, Department of Industrial and Manufacturing Systems Engineering, Texas 76019, United States
| | - Zi-Jing Lin
- Joint Graduate Program between University of Texas at Arlington and University of Texas Southwestern Medical Center, University of Texas at Arlington, Department of Bioengineering, Texas 76019, United StatescNational Synchrotron Radiation Research Center
| | - Mary Cazzell
- Cook Children's Medical Center, Fort Worth, Texas 76104, United States
| | - Hanli Liu
- Joint Graduate Program between University of Texas at Arlington and University of Texas Southwestern Medical Center, University of Texas at Arlington, Department of Bioengineering, Texas 76019, United States
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243
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Koo B, Lee HG, Nam Y, Kang H, Koh CS, Shin HC, Choi S. A hybrid NIRS-EEG system for self-paced brain computer interface with online motor imagery. J Neurosci Methods 2015; 244:26-32. [PMID: 24797225 DOI: 10.1016/j.jneumeth.2014.04.016] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 04/14/2014] [Accepted: 04/15/2014] [Indexed: 10/25/2022]
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244
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Grabtchak S, Montgomery LG, Pang B, Wang Y, Zhang C, Li Z, Xia Y, Whelan WM. Interstitial diffuse radiance spectroscopy of gold nanocages and nanorods in bulk muscle tissues. Int J Nanomedicine 2015; 10:1307-20. [PMID: 25709450 PMCID: PMC4335609 DOI: 10.2147/ijn.s79246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Radiance spectroscopy was applied to the interstitial detection of localized inclusions containing Au nanocages or nanorods with various concentrations embedded in porcine muscle phantoms. The radiance was quantified using a perturbation approach, which enabled the separation of contributions from the porcine phantom and the localized inclusion, with the inclusion serving as a perturbation probe of photon distributions in the turbid medium. Positioning the inclusion at various places in the phantom allowed for tracking of photons that originated from a light source, passed through the inclusion's location, and reached a detector. The inclusions with high extinction coefficients were able to absorb nearly all photons in the range of 650-900 nm, leading to a spectrally flat radiance signal. This signal could be converted to the relative density of photons incident on the inclusion. Finally, the experimentally measured quantities were expressed via the relative perturbation and arranged into the classical Beer-Lambert law that allowed one to extract the extinction coefficients of various types of Au nanoparticles in both the transmission and back reflection geometries. It was shown that the spatial variation of perturbation could be described as 1/r dependence, where r is the distance between the inclusion and the detector. Due to a larger absorption cross section, Au nanocages produced greater perturbations than Au nanorods of equal particle concentration, indicating a better suitability of Au nanocages as contrast agents for optical measurements in turbid media. Individual measurements from different inclusions were combined into detectability maps.
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Affiliation(s)
- Serge Grabtchak
- Department of Physics, University of Prince Edward Island, Charlottetown, PEI, Canada
- Departments of Electrical and Computer Engineering, and Physics, Dalhousie University, Halifax, Canada
| | - Logan G Montgomery
- Department of Physics, University of Prince Edward Island, Charlottetown, PEI, Canada
| | - Bo Pang
- Department of Biomedical Engineering, Peking University, Beijing, People’s Republic of China
- The Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, USA
| | - Yi Wang
- The Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, USA
- Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing, People’s Republic of China
| | - Chao Zhang
- Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, People’s Republic of China
- College of Physics and Optoelectronics, South China University of Technology, Guangzhou, People’s Republic of China
| | - Zhiyuan Li
- Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, People’s Republic of China
- College of Physics and Optoelectronics, South China University of Technology, Guangzhou, People’s Republic of China
| | - Younan Xia
- The Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, USA
- School of Chemistry and Biochemistry, and School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - William M Whelan
- Department of Physics, University of Prince Edward Island, Charlottetown, PEI, Canada
- Atlantic Veterinary College, Charlottetown, PEI, Canada
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245
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Giacometti P, Diamond SG. Correspondence of electroencephalography and near-infrared spectroscopy sensitivities to the cerebral cortex using a high-density layout. NEUROPHOTONICS 2014; 1:025001. [PMID: 25558462 PMCID: PMC4280681 DOI: 10.1117/1.nph.1.2.025001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
This study investigates the correspondence of the cortical sensitivity of electroencephalography (EEG) and near-infrared spectroscopy (NIRS). EEG forward model sensitivity to the cerebral cortex was calculated for 329 EEG electrodes following the 10-5 EEG positioning system using a segmented structural magnetic resonance imaging scan of a human subject. NIRS forward model sensitivity was calculated for the same subject using 156 NIRS source-detector pairs selected from 32 source and 32 detector optodes positioned on the scalp using a subset of the 10-5 EEG positioning system. Sensitivity correlations between colocalized NIRS source-detector pair groups and EEG channels yielded R = 0.46 ± 0.08. Groups of NIRS source-detector pairs with maximum correlations to EEG electrode sensitivities are tabulated. The mean correlation between the point spread functions for EEG and NIRS regions of interest (ROI) was R = 0.43 ± 0.07. Spherical ROIs with radii of 26 mm yielded the maximum correlation between EEG and NIRS averaged across all cortical mesh nodes. These sensitivity correlations between EEG and NIRS should be taken into account when designing multimodal studies of neurovascular coupling and when using NIRS as a statistical prior for EEG source localization.
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Affiliation(s)
- Paolo Giacometti
- Thayer School of Engineering at Dartmouth, 14 Engineering Drive, Hanover, New Hampshire 03755, United States
- Address all correspondence to: Paolo Giacometti, E-mail:
| | - Solomon G. Diamond
- Thayer School of Engineering at Dartmouth, 14 Engineering Drive, Hanover, New Hampshire 03755, United States
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246
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Schaeffer JD, Yennu AS, Gandy KC, Tian F, Liu H, Park H. An fNIRS investigation of associative recognition in the prefrontal cortex with a rapid event-related design. J Neurosci Methods 2014; 235:308-15. [DOI: 10.1016/j.jneumeth.2014.07.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 07/15/2014] [Indexed: 01/30/2023]
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247
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Xu G, Li X, Li D, Liu X. A DAQ-device-based continuous wave near-infrared spectroscopy system for measuring human functional brain activity. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2014; 2014:107320. [PMID: 25180044 PMCID: PMC4142377 DOI: 10.1155/2014/107320] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Accepted: 06/16/2014] [Indexed: 11/18/2022]
Abstract
In the last two decades, functional near-infrared spectroscopy (fNIRS) is getting more and more popular as a neuroimaging technique. The fNIRS instrument can be used to measure local hemodynamic response, which indirectly reflects the functional neural activities in human brain. In this study, an easily implemented way to establish DAQ-device-based fNIRS system was proposed. Basic instrumentation components (light sources driving, signal conditioning, sensors, and optical fiber) of the fNIRS system were described. The digital in-phase and quadrature demodulation method was applied in LabVIEW software to distinguish light sources from different emitters. The effectiveness of the custom-made system was verified by simultaneous measurement with a commercial instrument ETG-4000 during Valsalva maneuver experiment. The light intensity data acquired from two systems were highly correlated for lower wavelength (Pearson's correlation coefficient r = 0.92, P < 0.01) and higher wavelength (r = 0.84, P < 0.01). Further, another mental arithmetic experiment was implemented to detect neural activation in the prefrontal cortex. For 9 participants, significant cerebral activation was detected in 6 subjects (P < 0.05) for oxyhemoglobin and in 8 subjects (P < 0.01) for deoxyhemoglobin.
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Affiliation(s)
- Gang Xu
- State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing 100875, China
- Center for Collaboration and Innovation in Brain and Learning Sciences, Beijing Normal University, Beijing 100875, China
| | - Xiaoli Li
- State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing 100875, China
- Center for Collaboration and Innovation in Brain and Learning Sciences, Beijing Normal University, Beijing 100875, China
| | - Duan Li
- School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Xiaomin Liu
- School of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China
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248
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Kopton IM, Kenning P. Near-infrared spectroscopy (NIRS) as a new tool for neuroeconomic research. Front Hum Neurosci 2014; 8:549. [PMID: 25147517 PMCID: PMC4124877 DOI: 10.3389/fnhum.2014.00549] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Accepted: 07/07/2014] [Indexed: 11/23/2022] Open
Abstract
Over the last decade, the application of neuroscience to economic research has gained in importance and the number of neuroeconomic studies has grown extensively. The most common method for these investigations is fMRI. However, fMRI has limitations (particularly concerning situational factors) that should be countered with other methods. This review elaborates on the use of functional Near-Infrared Spectroscopy (fNIRS) as a new and promising tool for investigating economic decision making both in field experiments and outside the laboratory. We describe results of studies investigating the reliability of prototype NIRS studies, as well as detailing experiments using conventional and stationary fNIRS devices to analyze this potential. This review article shows that further research using mobile fNIRS for studies on economic decision making outside the laboratory could be a fruitful avenue helping to develop the potential of a new method for field experiments outside the laboratory.
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Affiliation(s)
- Isabella M Kopton
- Department of Corporate Management and Economics, Zeppelin Universität Friedrichshafen, Germany
| | - Peter Kenning
- Department of Corporate Management and Economics, Zeppelin Universität Friedrichshafen, Germany ; Faculty of Business Administration and Economics, Heinrich-Heine-Universität Düsseldorf, Germany
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249
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Chuang CC, Sun CW. Gender-related effects of prefrontal cortex connectivity: a resting-state functional optical tomography study. BIOMEDICAL OPTICS EXPRESS 2014; 5:2503-16. [PMID: 25136481 PMCID: PMC4132984 DOI: 10.1364/boe.5.002503] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 06/29/2014] [Accepted: 06/29/2014] [Indexed: 05/04/2023]
Abstract
The prefrontal cortex (PFC) is thought to play an important role in "higher" brain functions such as personality and emotion that may associated with several gender-related mental disorders. In this study, the gender effects of functional connectivity, cortical lateralization and significantly differences in the PFC were investigated by using resting-state functional optical tomography (fOT) measurement. A total of forty subjects including twenty healthy male and twenty healthy female adults were recruited for this study. In the results, the hemoglobin responses are higher in the male group. Additionally, male group exhibited the stronger connectivity in the PFC regions. In the result of lateralization, leftward dominant was observed in the male group but bilateral dominance in the female group. Finally, the 11 channels of the inferior PFC regions (corresponding to the region of Brodmann area 45) are significant different with spectrum analysis. Our findings suggest that the resting-state fOT method can provide high potential to apply to clinical neuroscience for several gender-related mental disorders diagnosis.
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Affiliation(s)
- Ching-Cheng Chuang
- Biomedical Optical Imaging Lab, Department of Photonics, National Chiao Tung University, Hsinchu 30010, Taiwan
- Institute of Biomedical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Chia-Wei Sun
- Biomedical Optical Imaging Lab, Department of Photonics, National Chiao Tung University, Hsinchu 30010, Taiwan
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250
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Machado A, Marcotte O, Lina JM, Kobayashi E, Grova C. Optimal optode montage on electroencephalography/functional near-infrared spectroscopy caps dedicated to study epileptic discharges. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:026010. [PMID: 24525860 DOI: 10.1117/1.jbo.19.2.026010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Accepted: 01/13/2014] [Indexed: 05/23/2023]
Abstract
Functional near-infrared spectroscopy (fNIRS), acquired simultaneously with electroencephalography (EEG), allows the investigation of hemodynamic brain responses to epileptic activity. Because the presumed epileptogenic focus is patient-specific, an appropriate source/detector (SD) montage has to be reconfigured for each patient. The combination of EEG and fNIRS, however, entails several constraints on montages, and finding an optimal arrangement of optodes on the cap is an important issue. We present a method for computing an optimal SD montage on an EEG/fNIRS cap that focuses on one or several specific brain regions; the montage maximizes the spatial sensitivity. We formulate this optimization problem as a linear integer programming problem. The method was evaluated on two EEG/fNIRS caps. We simulated absorbers at different locations on a head model and generated realistic optical density maps on the scalp. We found that the maps of optimal SD montages had spatial resolution properties comparable to those of regular SD arrangements for the whole head with significantly fewer sensors than regular SD arrangements. In addition, we observed that optimal montages yielded improved spatial density of fNIRS measurements over the targeted regions together with an increase in signal-to-noise ratio.
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Affiliation(s)
- Alexis Machado
- McGill University, Multimodal Functional Imaging Laboratory, Biomedical Engineering Department, H3A 2B4, Québec, Canada
| | - Odile Marcotte
- GERAD, École des HEC, Montréal, H3T 2A7, Québec, CanadaeUniversité du Québec à Montréal, Département d'informatique, H3C 3P8 Québec Canada
| | - Jean Marc Lina
- École de Technologie Supérieure de l'Université du Québec, H3C 1K3, Québec, Canada
| | - Eliane Kobayashi
- McGill University, Montreal Neurological Institute, Department of Neurology and Neurosurgery, H3A 2B4, Québec, Canada
| | - Christophe Grova
- McGill University, Multimodal Functional Imaging Laboratory, Biomedical Engineering Department, H3A 2B4, Québec, CanadabMcGill University, Montreal Neurological Institute, Department of Neurology and Neurosurgery, H3A 2B4, Québec, Canada
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