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Development and initial evaluation of 7-T q-ball imaging of the human brain

Pratik Mukherjee, Christopher P. Hess, Duan Xu, Eric T. Han, Douglas A. Kelley, Daniel B. Vigneron
2008 Magnetic Resonance Imaging  
The improvement of 7T QBI at b factors as high as 6000 s/mm 2 resulted in better angular resolution than 3T for depicting fibers crossing at shallow angles.  ...  Diffusion tensor imaging (DTI) noninvasively depicts white matter connectivity in regions where the Gaussian model of diffusion is valid, but yields inaccurate results where diffusion has a more complex  ...  -10107, as part of the University of California's Industry University Cooperative Research Program, and a seed grant from the Department of Radiology of the University of California, San Francisco.  ... 
doi:10.1016/j.mri.2007.05.011 pmid:17692489 pmcid:PMC2997615 fatcat:iny4bqugdfbubkg6te4mzyapjy

Quantitative Diffusion Tensor Imaging of White Matter Microstructure in Dog Brain at 7T

Ping Wang, Jian-Ming Zhu
2011 Open Medical Imaging Journal  
The purpose of this study is to develop a noninvasive quantitative imaging scheme to assess the functional microanatomy of dog brain using high resolution diffusion tensor imaging (DTI) at 7-Tesla (T)  ...  Experimental results show much higher scalar contrast and more accurate fiber structures based on the FA weighted color map and fiber orientation map, indicating this high angular DTI technique at 7T is  ...  Rossmeisl at the Virginia-Maryland Regional College of Veterinary Medicine for providing the animal models to perform this study. Authors also thank Ms.  ... 
doi:10.2174/1874347101004010001 fatcat:s4jmsoap5zf2jcdb7mwoddk2sq

Diffusion imaging in humans at 7T using readout-segmented EPI and GRAPPA

Robin M. Heidemann, David A. Porter, Alfred Anwander, Thorsten Feiweier, Keith Heberlein, Thomas R. Knösche, Robert Turner
2010 Magnetic Resonance in Medicine  
The Anatomical magnetic resonance imaging studies at 7T have demonstrated the ability to provide high quality images of human tissue in vivo.  ...  of diffusion-weighted images with a high spatial resolution.  ...  Acknowledgment We are grateful for the support and technical contributions of Dr Heiko Meyer and Stefan Huwer from Siemens Healthcare.  ... 
doi:10.1002/mrm.22480 pmid:20577977 fatcat:aro3akwzwrcvjgubcsn2f73lou

The Digital Brain Bank: an open access platform for post-mortem datasets [article]

Benjamin C. Tendler, Taylor Hanayik, Olaf Ansorge, Sarah Bangerter-Christensen, Gregory S. Berns, Mads F. Bertelsen, Katherine L. Bryant, Sean Foxley, Amy F.D. Howard, Istvan Huszar, Alexandre A. Khrapitchev, Anna Leonte (+14 others)
2021 bioRxiv   pre-print
This includes one of the highest-resolution whole-brain human diffusion MRI datasets ever acquired, whole-brain diffusion MRI in seven non-human primate species, and one of the largest post-mortem whole-brain  ...  Post-mortem MRI provides the opportunity to acquire high-resolution datasets to investigate neuroanatomy, and validate the origins of image contrast through microscopy comparisons.  ...  Acknowledgements The Digital Brain Bank is supported by the Wellcome Trust (202788/Z/16/Z) and Medical Research Council (MRC, MR/K02213X/1).  ... 
doi:10.1101/2021.06.21.449154 fatcat:fyg645rmojea7hpa2sscyku4cq

Comparison of diffusion MRI and CLARITY fiber orientation estimates in both gray and white matter regions of human and primate brain

C. Leuze, M. Goubran, M. Barakovic, M. Aswendt, Q. Tian, B. Hsueh, A. Crow, E. Weber, G. Steinberg, M. Zeineh, E. Plowey, A. Daducci (+4 others)
2020 NeuroImage  
of the dMRI tensors and the structure tensors in the vasculature stained CLARITY images.  ...  Diffusion MRI (dMRI) represents one of the few methods for mapping brain fiber orientations non-invasively.  ...  D-G Images indicating the brain location of the extracted tissue used for high-resolution two-photon CLARITY.  ... 
doi:10.1016/j.neuroimage.2020.117692 pmid:33385546 pmcid:PMC7953593 fatcat:ms3ogw6hubgpjohnjhetyazctq

MRI Technologies in Recent Human Brain Mapping

Yuka SASAKI
2007 Plasma and Fusion Research  
The advanced MRI technologies and techniques include, but not to limited to, the magnetic resonance imaging at higher magnetic field strengths, diffusion tensor imaging, multimodal neuroimaging, and monkey  ...  The recent magnetic resonance imaging (MRI) technology and techniques used in human brain mapping are remarkable. They are getting, faster, stronger and better.  ...  The authors' imaging work was supported by National Center for Research Resources P41RR14075, the Mental Illness and Neruoscience Discovery Institute, the Athinoula A.  ... 
doi:10.1585/pfr.2.s1004 fatcat:juooamqn3fexhpf4s3pylcbpfy

Cortical fibers orientation mapping using in-vivo whole brain 7 T diffusion MRI

Omer F. Gulban, Federico De Martino, An T. Vu, Essa Yacoub, Kamil Uğurbil, Christophe Lenglet
2018 NeuroImage  
There is currently no whole brain in-vivo data leveraging multi-shell diffusion MRI acquisition at high spatial resolution, and depth dependent analysis, to characterize the complex organization of cortical  ...  We leverage the high spatial (1.05mm isotropic) and angular (198 diffusion gradient directions) resolution of this whole brain dataset to improve cortical fiber orientations mapping, and study neurites  ...  Acquisition techniques, such as diffusion tensor imaging (Basser et al., 1994) , high angular resolution diffusion imaging (Tuch et al., 2002) , diffusion spectrum imaging (Wedeen et al., 2005) and  ... 
doi:10.1016/j.neuroimage.2018.05.010 pmid:29753105 pmcid:PMC6118131 fatcat:nmszbf4k2bakbk6nsolhjb32zy

Position-orientation adaptive smoothing of diffusion weighted magnetic resonance data (POAS)

S.M.A. Becker, K. Tabelow, H.U. Voss, A. Anwander, R.M. Heidemann, J. Polzehl
2012 Medical Image Analysis  
Attempts to achieve higher image resolution come at the expense of deteriorating image quality.  ...  Although at 7T the MR signal is much larger than at lower field strengths, significant noise still emerges at the desired high resolutions. Noise reduction is therefore essential.  ... 
doi:10.1016/j.media.2012.05.007 pmid:22677817 fatcat:o66vq2ps4rddhi3a7tfne6mype

Identification of the pedunculopontine nucleus and surrounding white matter tracts on 7T diffusion tensor imaging, combined with histological validation

D. J. H. A. Henssen, D. Kuppens, F. J. A. Meijer, A. M. van Cappellen van Walsum, Y. Temel, E. Kurt
2018 Surgical and Radiologic Anatomy  
Methods This study aimed to localize the PPN using 7T magnetic resonance (MR) imaging and diffusion tensor imaging (DTI) of its white matter borders in one post-mortem brain.  ...  However, identifying the PPN can be challenging as the PPN is poorly visualized on conventional or even high-resolution MR scans.  ...  Fortunately, promising methods have been developed for 7T DW-MRI and DTI leading to promising quality image data at high-resolutions [29] .  ... 
doi:10.1007/s00276-018-2120-3 fatcat:4r4qdumn7jgybi2dxvfut6koae

Diffusion tensor echo planar imaging using surface coil transceiver with a semiadiabatic RF pulse sequence at 14.1T

Yohan van de Looij, Nicolas Kunz, Petra Hüppi, Rolf Gruetter, Stéphane Sizonenko
2010 Magnetic Resonance in Medicine  
acquisition schemes, of critical importance for reducing the long scan times implicated in diffusion tensor imaging.  ...  It resulted in artifact free images with excellent SNR throughout the brain. Diffusion tensor derived parameters obtained within the rat brain were in excellent agreement with reported values.  ...  ACKNOWLEDGMENTS The authors thank Dr. Jose P. Marques and Dr. Ruud van Heeswijk for their help in revising this manuscript.  ... 
doi:10.1002/mrm.22656 pmid:20939068 fatcat:jzhc6pvdlreebon26fpqwdhd2e

Spinal cord MRI at 7T

Robert L. Barry, S. Johanna Vannesjo, Samantha By, John C. Gore, Seth A. Smith
2018 NeuroImage  
Magnetic resonance imaging (MRI) of the human spinal cord at 7 Tesla has been demonstrated by a handful of research sites worldwide, and the spinal cord remains one of the areas in which higher fields  ...  and resolution could have high impact.  ...  The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.  ... 
doi:10.1016/j.neuroimage.2017.07.003 pmid:28684332 pmcid:PMC5894871 fatcat:36pdxpbmwbhajlvm6rkfbkw2va

Use of multi-flip angle measurements to account for transmit inhomogeneity and non-Gaussian diffusion in DW-SSFP [article]

Benjamin C. Tendler, Sean Foxley, Moises Hernandez-Fernandez, Michiel Cottaar, Connor Scott, Olaf Ansorge, Karla Miller, Saad Jbabdi
2019 bioRxiv   pre-print
The improved SNR and resolution available at ultra-high field has motivated its use at 7T.  ...  DW-SSFP datasets were acquired from five fixed whole human post-mortem brains with a pair of flip angles that jointly optimize the diffusion contrast-to-noise across the brain.  ...  Introduction Diffusion imaging of post-mortem human brains has important applications for both validating diffusion contrast mechanisms through comparison with microscopy and achieving very high-resolution  ... 
doi:10.1101/861880 fatcat:3mto2qtwgvhphpriedi5kkapj4

Unique patterns of diffusion directionality in rat brain tumors revealed by high-resolution diffusion tensor MRI

Jiangyang Zhang, Peter C.M. van Zijl, John Laterra, Amandeep Salhotra, Bachchu Lal, Susumu Mori, Jinyuan Zhou
2007 Magnetic Resonance in Medicine  
Diffusion tensor imaging (DTI) is a new technique that uses the microscopic motion of water molecules to probe tissue three-dimensional (3D) microstructures.  ...  In this study, high-resolution DTI was performed on rats bearing intracranial 9L gliosarcoma, F98 glioma, and human glioblastoma.  ...  Acknowledgments The authors thank C. David James (Mayo Clinic) for providing the human glioblastoma xenograft model used in this study. The authors also thank Ms.  ... 
doi:10.1002/mrm.21371 pmid:17763344 pmcid:PMC3715744 fatcat:cdgs6raqwzcrngbf2a7c3kqcqu

Use of multi-flip angle measurements to account for transmit inhomogeneity and non-Gaussian diffusion in DW-SSFP

Benjamin C. Tendler, Sean Foxley, Moises Hernandez-Fernandez, Michiel Cottaar, Connor Scott, Olaf Ansorge, Karla L. Miller, Saad Jbabdi
2020 NeuroImage  
Diffusion-weighted steady-state free precession (DW-SSFP) is an SNR-efficient diffusion imaging method. The improved SNR and resolution available at ultra-high field has motivated its use at 7T.  ...  Data were acquired from five fixed whole human post-mortem brains with a pair of flip angles that jointly optimize the diffusion contrast-to-noise (CNR) across the brain.  ...  Introduction Diffusion imaging of post-mortem human brains has important applications for both validating diffusion contrast mechanisms through comparison with microscopy and achieving very high-resolution  ... 
doi:10.1016/j.neuroimage.2020.117113 pmid:32621975 pmcid:PMC7573656 fatcat:utmfjy74rvf4zdoizdznw5th6y

Probing white-matter microstructure with higher-order diffusion tensors and susceptibility tensor MRI

Chunlei Liu, Nicole E. Murphy, Wei Li
2013 Frontiers in Integrative Neuroscience  
In this study, we investigated the relationship between diffusion and magnetic susceptibility in the white matter. Experiments were conducted on phantoms and human brains in vivo.  ...  The emergence of quantitative susceptibility mapping and susceptibility tensor imaging (STI) has provided another unique tool for assessing the structure of white matter.  ...  ACKNOWLEDGMENTS The authors thank Arnaud Guidon for implementing the Hermite tensor function in the C language. The authors thank Ching-Po Lin, Ph.D., for providing the phantom diffusion data.  ... 
doi:10.3389/fnint.2013.00011 pmid:23507987 pmcid:PMC3589706 fatcat:w26yna37mfbvrdky7yyyfqxfau
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