Karl Helmer
Karl Helmer
Massachusetts General Hospital
Verified email at nmr.mgh.harvard.edu
TitleCited byYear
A review of magnetic resonance imaging and diffusion tensor imaging findings in mild traumatic brain injury
ME Shenton, HM Hamoda, JS Schneiderman, S Bouix, O Pasternak, ...
Brain imaging and behavior 6 (2), 137-192, 2012
6392012
Restricted diffusion in sedimentary rocks. Determination of surface-area-to-volume ratio and surface relaxivity
MD Hurlimann, KG Helmer, LL Latour, CH Sotak
Journal of Magnetic Resonance, Series A 111 (2), 169-178, 1994
2821994
The role of spreading depression in focal ischemia evaluated bv dffusion mapping
K Takano, LL Latour, JE Formato, RAD Carano, KG Helmer, Y Hasegawa, ...
Annals of Neurology: Official Journal of the American Neurological …, 1996
2601996
Regional white matter volume differences in nondemented aging and Alzheimer's disease
DH Salat, DN Greve, JL Pacheco, BT Quinn, KG Helmer, RL Buckner, ...
Neuroimage 44 (4), 1247-1258, 2009
2552009
Microstructural status of ipsilesional and contralesional corticospinal tract correlates with motor skill in chronic stroke patients
JD Schaechter, ZP Fricker, KL Perdue, KG Helmer, MG Vangel, DN Greve, ...
Human brain mapping 30 (11), 3461-3474, 2009
2472009
Data sharing in neuroimaging research
JB Poline, JL Breeze, SS Ghosh, K Gorgolewski, YO Halchenko, M Hanke, ...
Frontiers in neuroinformatics 6, 9, 2012
2072012
Spin echoes in a constant gradient and in the presence of simple restriction
MD Hurlimann, KG Helmer, TM Deswiet, PN Sen
Journal of Magnetic Resonance 113, 260-264, 1995
1431995
T2* mapping and B0 orientation-dependence at 7 T reveal cyto-and myeloarchitecture organization of the human cortex
J Cohen-Adad, JR Polimeni, KG Helmer, T Benner, JA McNab, LL Wald, ...
Neuroimage 60 (2), 1006-1014, 2012
1092012
Multispectral analysis of the temporal evolution of cerebral ischemia in the rat brain
RAD Carano, F Li, K Irie, KG Helmer, MD Silva, M Fisher, CH Sotak
Journal of Magnetic Resonance Imaging 12 (6), 842-858, 2000
1042000
Secondary decline in apparent diffusion coefficient and neurological outcomes after a short period of focal brain ischemia in rats
F Li, MD Silva, KF Liu, KG Helmer, T Omae, JD Fenstermacher, CH Sotak, ...
Annals of Neurology: Official Journal of the American Neurological …, 2000
1012000
Separating changes in the intra‐and extracellular water apparent diffusion coefficient following focal cerebral ischemia in the rat brain
MD Silva, T Omae, KG Helmer, F Li, M Fisher, CH Sotak
Magnetic Resonance in Medicine: An Official Journal of the International …, 2002
972002
Direct visualization of the perforant pathway in the human brain with ex vivo diffusion tensor imaging
JC Augustinack, K Helmer, KE Huber, S Kakunoori, L Zöllei, B Fischl
Frontiers in human neuroscience 4, 42, 2010
882010
The application of porous‐media theory to the investigation of time‐dependent diffusion in in vivo systems
KG Helmer, BJ Dardzinski, CH Sotak
NMR in Biomedicine 8 (7), 297-306, 1995
811995
Hockey Concussion Education Project, Part 3. White matter microstructure in ice hockey players with a history of concussion: a diffusion tensor imaging study
T Sasaki, O Pasternak, M Mayinger, M Muehlmann, P Savadjiev, S Bouix, ...
Journal of neurosurgery 120 (4), 882-890, 2014
722014
Acute postischemic renormalization of the apparent diffusion coefficient of water is not associated with reversal of astrocytic swelling and neuronal shrinkage in rats
F Li, KF Liu, MD Silva, X Meng, T Gerriets, KG Helmer, JD Fenstermacher, ...
American journal of neuroradiology 23 (2), 180-188, 2002
722002
Hockey Concussion Education Project, Part 2. Microstructural white matter alterations in acutely concussed ice hockey players: a longitudinal free-water MRI study
O Pasternak, IK Koerte, S Bouix, E Fredman, T Sasaki, M Mayinger, ...
Journal of neurosurgery 120 (4), 873-881, 2014
712014
Changes in ADC caused by tensile loading of rabbit achilles tendon: evidence for water transport
S Han, SJ Gemmell, KG Helmer, P Grigg, JW Wellen, AH Hoffman, ...
Journal of Magnetic Resonance 144 (2), 217-227, 2000
682000
Towards structured sharing of raw and derived neuroimaging data across existing resources
DB Keator, K Helmer, J Steffener, JA Turner, TGM Van Erp, S Gadde, ...
Neuroimage 82, 647-661, 2013
582013
Enabling collaborative research using the biomedical informatics research network (BIRN)
KG Helmer, JL Ambite, J Ames, R Ananthakrishnan, G Burns, ...
Journal of the American Medical Informatics Association 18 (4), 416-422, 2011
582011
Multicenter reliability of diffusion tensor imaging
VA Magnotta, JT Matsui, D Liu, HJ Johnson, JD Long, BD Bolster Jr, ...
Brain connectivity 2 (6), 345-355, 2012
512012
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Articles 1–20