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Meneses BP, Stockmann JP, Arango N, Gapais PF, Giacomini E, Mauconduit F, Gras V, Boulant N, Vignaud A, Luong M, Amadon A. Shim Coils Tailored for Correcting B0 Inhomogeneity in the Human Brain (SCOTCH): Design Methodology and 48-Channel Prototype Assessment in 7-Tesla MRI. Neuroimage 2022; 261:119498. [PMID: 35917918 DOI: 10.1016/j.neuroimage.2022.119498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 06/30/2022] [Accepted: 07/19/2022] [Indexed: 10/31/2022] Open
Abstract
Increased static field inhomogeneities are a burden for human brain MRI at Ultra-High-Field. In particular they cause enhanced Echo-Planar image distortions and signal losses due to magnetic susceptibility gradients at air-tissue interfaces in the subject's head. In the past decade, Multi-Coil Arrays (MCA) have been proposed to shim the field in the brain better than the 2nd or 3rd order Spherical Harmonic (SH) coils usually offered by MRI manufacturers. Here we present a novel MCA, named SCOTCH, optimized for whole brain shimming. Based on a cylindrical structure, it features several layers of small coils whose shape, size and location are found from a principal component analysis of ideal stream functions computed from an internal 100-brain fieldmap database. From an Open-Access external database of 126 brains, our SCOTCH implementation is shown to be equivalent to a partial 7th-order SH system with unlimited power, outperforming all known existing MCA prototypes. This result is further confirmed by a low-cost 30-cm diameter SCOTCH prototype built with 48 coils on 3 layers, and tested on 7 volunteers at 7T with a parallel-transmit RF coil made to be inserted in SCOTCH. Echo-Planar images of the subject brains before and after SCOTCH shimming show large signal recoveries, especially in the prefrontal cortex.
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Affiliation(s)
- Bruno Pinho Meneses
- Universite Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, 91191 Gif-sur-Yvette, France
| | - Jason P Stockmann
- Athinoula A. Martinos Center for Biomedical Imaging, Harvard Medical School, Massachusetts General Hospital, Charlestown, MA, 02129, USA
| | - Nicolas Arango
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Paul-François Gapais
- Universite Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, 91191 Gif-sur-Yvette, France
| | - Eric Giacomini
- Universite Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, 91191 Gif-sur-Yvette, France
| | - Franck Mauconduit
- Universite Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, 91191 Gif-sur-Yvette, France
| | - Vincent Gras
- Universite Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, 91191 Gif-sur-Yvette, France
| | - Nicolas Boulant
- Universite Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, 91191 Gif-sur-Yvette, France
| | - Alexandre Vignaud
- Universite Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, 91191 Gif-sur-Yvette, France
| | - Michel Luong
- Universite Paris-Saclay, CEA, IRFU, DACM, Gif-sur-Yvette 91191, France
| | - Alexis Amadon
- Universite Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, 91191 Gif-sur-Yvette, France.
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Tasserie J, Grigis A, Uhrig L, Dupont M, Amadon A, Jarraya B. Pypreclin: An automatic pipeline for macaque functional MRI preprocessing. Neuroimage 2020; 207:116353. [DOI: 10.1016/j.neuroimage.2019.116353] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 11/08/2019] [Accepted: 11/10/2019] [Indexed: 12/12/2022] Open
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Comoy EE, Mikol J, Jaffré N, Lebon V, Levavasseur E, Streichenberger N, Sumian C, Perret-Liaudet A, Eloit M, Andreoletti O, Haïk S, Hantraye P, Deslys JP. Experimental transfusion of variant CJD-infected blood reveals previously uncharacterised prion disorder in mice and macaque. Nat Commun 2017; 8:1268. [PMID: 29097653 PMCID: PMC5668246 DOI: 10.1038/s41467-017-01347-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 09/11/2017] [Indexed: 12/12/2022] Open
Abstract
Exposure of human populations to bovine spongiform encephalopathy through contaminated food has resulted in <250 cases of variant Creutzfeldt-Jakob disease (vCJD). However, more than 99% of vCJD infections could have remained silent suggesting a long-term risk of secondary transmission particularly through blood. Here, we present experimental evidence that transfusion in mice and non-human primates of blood products from symptomatic and non-symptomatic infected donors induces not only vCJD, but also a different class of neurological impairments. These impairments can all be retransmitted to mice with a pathognomonic accumulation of abnormal prion protein, thus expanding the spectrum of known prion diseases. Our findings suggest that the intravenous route promotes propagation of masked prion variants according to different mechanisms involved in peripheral replication.
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Affiliation(s)
- Emmanuel E Comoy
- CEA, Institut François Jacob, Université Paris-Saclay, 18 Route du Panorama, 92265, Fontenay-aux-Roses, France.
| | - Jacqueline Mikol
- CEA, Institut François Jacob, Université Paris-Saclay, 18 Route du Panorama, 92265, Fontenay-aux-Roses, France
| | - Nina Jaffré
- CEA, Institut François Jacob, Université Paris-Saclay, 18 Route du Panorama, 92265, Fontenay-aux-Roses, France
- MacoPharma, 200 Chaussée Fernand Forest, 59200, Tourcoing, France
| | - Vincent Lebon
- CEA, Institut François Jacob, Université Paris-Saclay, 18 Route du Panorama, 92265, Fontenay-aux-Roses, France
| | - Etienne Levavasseur
- Université Pierre et Marie Curie, UMR-S 1127, CNRS UMR 722, Institut du Cerveau et de la Moelle Epinière, G.H. Pitié-Salpêtrière, 47 Boulevard de l'Hôpital, 75013, Paris, France
| | - Nathalie Streichenberger
- Hospices Civils de Lyon, Université Claude Bernard Lyon 1, Institut NeuroMyogène CNRS UMR 5310-INSERM U1217, 59 Boulevard Pinel, 69677, Bron, France
| | - Chryslain Sumian
- MacoPharma, 200 Chaussée Fernand Forest, 59200, Tourcoing, France
| | - Armand Perret-Liaudet
- Hospices Civils de Lyon, Université Claude Bernard Lyon 1, Institut NeuroMyogène CNRS UMR 5310-INSERM U1217, 59 Boulevard Pinel, 69677, Bron, France
| | - Marc Eloit
- Institut Pasteur, 15 Rue du Docteur Roux, 75015, Paris, France
| | - Olivier Andreoletti
- UMR INRA-ENVT 1225, Ecole Nationale Vétérinaire de Toulouse, 23 chemin des Capelles, 31076, Toulouse, France
| | - Stéphane Haïk
- Université Pierre et Marie Curie, UMR-S 1127, CNRS UMR 722, Institut du Cerveau et de la Moelle Epinière, G.H. Pitié-Salpêtrière, 47 Boulevard de l'Hôpital, 75013, Paris, France
| | - Philippe Hantraye
- CEA, Institut François Jacob, Université Paris-Saclay, 18 Route du Panorama, 92265, Fontenay-aux-Roses, France
| | - Jean-Philippe Deslys
- CEA, Institut François Jacob, Université Paris-Saclay, 18 Route du Panorama, 92265, Fontenay-aux-Roses, France
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DiStasio MM, Francis JT. Use of frontal lobe hemodynamics as reinforcement signals to an adaptive controller. PLoS One 2013; 8:e69541. [PMID: 23894500 PMCID: PMC3718814 DOI: 10.1371/journal.pone.0069541] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 06/14/2013] [Indexed: 11/18/2022] Open
Abstract
Decision-making ability in the frontal lobe (among other brain structures) relies on the assignment of value to states of the animal and its environment. Then higher valued states can be pursued and lower (or negative) valued states avoided. The same principle forms the basis for computational reinforcement learning controllers, which have been fruitfully applied both as models of value estimation in the brain, and as artificial controllers in their own right. This work shows how state desirability signals decoded from frontal lobe hemodynamics, as measured with near-infrared spectroscopy (NIRS), can be applied as reinforcers to an adaptable artificial learning agent in order to guide its acquisition of skills. A set of experiments carried out on an alert macaque demonstrate that both oxy- and deoxyhemoglobin concentrations in the frontal lobe show differences in response to both primarily and secondarily desirable (versus undesirable) stimuli. This difference allows a NIRS signal classifier to serve successfully as a reinforcer for an adaptive controller performing a virtual tool-retrieval task. The agent's adaptability allows its performance to exceed the limits of the NIRS classifier decoding accuracy. We also show that decoding state desirabilities is more accurate when using relative concentrations of both oxyhemoglobin and deoxyhemoglobin, rather than either species alone.
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Affiliation(s)
- Marcello M DiStasio
- Biomedical Engineering Program, SUNY Downstate Medical Center and NYU Polytechnic, Brooklyn, New York, USA.
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High resolution 3T fMRI in anesthetized monkeys. J Neurosci Methods 2012; 205:86-95. [PMID: 22230769 DOI: 10.1016/j.jneumeth.2011.12.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 12/23/2011] [Accepted: 12/23/2011] [Indexed: 11/24/2022]
Abstract
Although there are numerous 3T MRI research devices all over the world, only a few functional studies at 3T have been done in anesthetized monkeys. In the past, anesthetized preparations were reported to be misleading when exploring cortical brain regions outside the primary sensory areas. Nonetheless, a great improvement has been achieved in the limited effect of anesthetic agents on the reactivity of the brain. Here, we re-address the feasibility and potential applications of the brain oxygen level dependent (BOLD) fMRI signal in Macaca mulatta monkeys that have been lightly anesthetized with sevoflurane and curarized. The monkeys were studied with commercially available coils and sequences using a 3T clinical magnet. We obtained sagittal T1 scout images, gray matter double inversion recovery, standard gradient echo sequences and gradient echo functional imaging sequences. Given that fMRI signals are most readily identified in the cerebral cortices, we optimized Echo Planar Imaging sequences to reproduce significant changes in the BOLD signal subsequent to a visual stimulation paradigm. Our results provide a satisfactory signal to noise ratio with a limited standard deviation range, when compared with studies on alert macaques. We suggest that the 3T magnet remains a valuable tool to analyze neural pathways in the macaque brain under light anesthesia and report the use of spatially resolved fMRI in higher visual areas of anesthetized monkeys. This methodology avoids the need for time-consuming training of awake monkeys, is stable over many hours, provides reproducible data and could be applied successfully to future functional studies.
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Landman BA, Huang AJ, Gifford A, Vikram DS, Lim IAL, Farrell JAD, Bogovic JA, Hua J, Chen M, Jarso S, Smith SA, Joel S, Mori S, Pekar JJ, Barker PB, Prince JL, van Zijl PCM. Multi-parametric neuroimaging reproducibility: a 3-T resource study. Neuroimage 2010; 54:2854-66. [PMID: 21094686 DOI: 10.1016/j.neuroimage.2010.11.047] [Citation(s) in RCA: 196] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Revised: 11/11/2010] [Accepted: 11/12/2010] [Indexed: 11/25/2022] Open
Abstract
Modern MRI image processing methods have yielded quantitative, morphometric, functional, and structural assessments of the human brain. These analyses typically exploit carefully optimized protocols for specific imaging targets. Algorithm investigators have several excellent public data resources to use to test, develop, and optimize their methods. Recently, there has been an increasing focus on combining MRI protocols in multi-parametric studies. Notably, these have included innovative approaches for fusing connectivity inferences with functional and/or anatomical characterizations. Yet, validation of the reproducibility of these interesting and novel methods has been severely hampered by the limited availability of appropriate multi-parametric data. We present an imaging protocol optimized to include state-of-the-art assessment of brain function, structure, micro-architecture, and quantitative parameters within a clinically feasible 60-min protocol on a 3-T MRI scanner. We present scan-rescan reproducibility of these imaging contrasts based on 21 healthy volunteers (11 M/10 F, 22-61 years old). The cortical gray matter, cortical white matter, ventricular cerebrospinal fluid, thalamus, putamen, caudate, cerebellar gray matter, cerebellar white matter, and brainstem were identified with mean volume-wise reproducibility of 3.5%. We tabulate the mean intensity, variability, and reproducibility of each contrast in a region of interest approach, which is essential for prospective study planning and retrospective power analysis considerations. Anatomy was highly consistent on structural acquisition (~1-5% variability), while variation on diffusion and several other quantitative scans was higher (~<10%). Some sequences are particularly variable in specific structures (ASL exhibited variation of 28% in the cerebral white matter) or in thin structures (quantitative T2 varied by up to 73% in the caudate) due, in large part, to variability in automated ROI placement. The richness of the joint distribution of intensities across imaging methods can be best assessed within the context of a particular analysis approach as opposed to a summary table. As such, all imaging data and analysis routines have been made publicly and freely available. This effort provides the neuroimaging community with a resource for optimization of algorithms that exploit the diversity of modern MRI modalities. Additionally, it establishes a baseline for continuing development and optimization of multi-parametric imaging protocols.
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Affiliation(s)
- Bennett A Landman
- Department of Electrical Engineering, Vanderbilt University, Nashville, TN 37235-1679, USA.
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Liu X, Zhu T, Gu T, Zhong J. Optimization of in vivo high-resolution DTI of non-human primates on a 3T human scanner. Methods 2010; 50:205-13. [DOI: 10.1016/j.ymeth.2009.06.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2008] [Accepted: 06/22/2009] [Indexed: 10/20/2022] Open
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Valette J, Chaumeil M, Guillermier M, Bloch G, Hantraye P, Lebon V. Diffusion-weighted NMR spectroscopy allows probing of 13C labeling of glutamate inside distinct metabolic compartments in the brain. Magn Reson Med 2008; 60:306-11. [PMID: 18666130 DOI: 10.1002/mrm.21661] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In the present work, diffusion-weighted (DW)-NMR spectroscopy of glutamate was performed during a (13)C-labeled glucose infusion in monkey brain (six experiments). It is shown that glutamate (13)C labeling occurs significantly faster at higher diffusion weightings-slightly for glutamate in position C4, and more markedly for glutamate in position C3. This demonstrates the existence of different diffusion compartments for glutamate, associated with different metabolic rates. Metabolic modeling of (13)C enrichment time-courses suggests that these compartments might be gray and white matter, each having a specific oxidative metabolism rate possibly paralleled by a specific glutamate diffusion coefficient.
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Lee HS, Woo DC, Min KH, Kim YK, Lee HK, Choe BY. Development of a solenoid RF coil for animal imaging in 3 T high-magnetic-field MRI. SCANNING 2008; 30:419-425. [PMID: 18697193 DOI: 10.1002/sca.20118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The purpose of this study was to develop a solenoid coil for use with small animals in a 3 Tesla horizontal magnetic resonance imaging (MRI) system, and to investigate image quality by examination of parameters such as signal-to-noise ratio (SNR) and Q-factor. A receiver solenoid coil was formed by winding three separate coils of copper tape around an acryl cylinder. The cylinder was supported at each end. A euthanized rat weighing 240 g was used as a subject animal for imaging. A cylindrical plastic tube containing a solution of 0.7 g/L CuSO(4) was used as a phantom. Measured SNRs were 985 in the phantom image 995 in the rat. The Q-factor was 89 in the phantom and 84 in the rat, in the loaded condition. The homogeneity of the radiofrequency (RF) field was good and the resolution of the image was sufficient to distinguish internal organs from one another in the abdomen of a rat. This study has demonstrated that a solenoid coil may be used to produce good quality images of small animals.
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Affiliation(s)
- Hong-Seok Lee
- College of Medicine, The Catholic University of Korea, Seoul, Korea
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