Laidlaw, David H. and Ahrens, Eric T. and Kremers, David and Readhead, Carol and Avalos, Matthew J. and Jacobs, Russell E. (1998) Visualizing diffusion tensor images of the mouse spinal cord. In: Proceedings Visualization '98. IEEE , Piscataway, NJ, pp. 127-134. ISBN 1-58113-106-2 http://resolver.caltech.edu/CaltechAUTHORS:20120110-133522277
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Within biological systems, water molecules undergo continuous stochastic Brownian motion. The diffusion rate can give clues to the structure of the underlying tissues. In some tissues, the rate is anisotropic. Diffusion-rate images can be calculated from diffusion-weighted MRI. A 2D diffusion tensor image (DTI) and an associated anatomical scalar field define seven values at each spatial location. We present two new methods for visually representing DTIs. The first method displays an array of ellipsoids, where the shape of each ellipsoid represents one tensor value. The ellipsoids are all normalized to approximately the same size so that they can be displayed simultaneously in context. The second method uses concepts from oil painting to represent the seven-valued data with multiple layers of varying brush strokes. Both methods successfully display most or all of the information in DTIs and provide exploratory methods for understanding them. The ellipsoid method has a simpler interpretation and explanation than the painting-motivated method; the painting-motivated method displays more of the information and is easier to read quantatively. We demonstrate the methods on images of the mouse spinal cord. The visualizations show significant differences between spinal cords from mice suffering from experimental allergic encephalomyelitis and spinal cords from wild-type mice. The differences are consistent with differences shown histologically and suggest that our new non-invasive imaging methodology and visualization of the results could have early diagnostic value for neurodegenerative diseases.
|Item Type:||Book Section|
|Additional Information:||© 1998 IEEE. Date of Current Version: 06 August 2002|
|Subject Keywords:||multi-valued visualization; tensor field visualization; oil painting|
|Other Numbering System:|
|Official Citation:||Laidlaw, D.H.; Ahrens, E.T.; Kremers, D.; Avalos, M.J.; Jacobs, R.E.; Readhead, C.; , "Visualizing diffusion tensor images of the mouse spinal cord," Visualization '98. Proceedings , vol., no., pp.127-134, 24-24 Oct. 1998 doi: 10.1109/VISUAL.1998.745294 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=745294&isnumber=16079|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||11 Jan 2012 17:57|
|Last Modified:||11 Jan 2012 17:57|
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