W.E.L. Grimson

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The perception of a visual stimulus can be inhibited by occipital transcranial magnetic stimulation. This visual suppression effect has been attributed to disruption in the cortical gray matter of primary visual cortex or in the fiber tracts leading to V1 from the thalamus. However, others have suggested that the visual suppression effect is caused by(More)
We d escribe a method for mapping t h e f u nctional regions of the brain using a tran-scranial magnetic stimulation TMS device. This device, when placed on a subject's scalp, stimulatesthe u n d erlying n eurons by generatingfocusedmagnetic eld pulses. A brain mapping i s t h en generatedby m easuring responses of diierent motor and sensory functions to t(More)
A surgical guidance and visualization system is presented, which uniquely integrates capabilities for data analysis and on-line interventional guidance into the setting of interventional MRI. Various pre-operative scans (T1- and T2-weighted MRI, MR angiography, and functional MRI (fMRI)) are fused and automatically aligned with the operating field of the(More)
We present a method for nding the pose of an object in the world by registering a 3D model of the object to multiple images of the object taken from diierent positions by maximization of mutual information. Using multiple views of the object enables the registration process to converge on the three dimensional pose much more accurately than is possible from(More)
BACKGROUND/PURPOSE Despite its potential for visualizing white matter fiber tracts in vivo, diffusion tensor tractography has found only limited applications in clinical research in which specific anatomic connections between distant regions need to be evaluated. We introduce a robust method for fiber clustering that guides the separation of anatomically(More)
We are developing an automated 3D change detection system which accurately registers medical imagery (e.g., MRI or CT) of the same patient from different times for diagnosing pathologies, monitoring treatment, and tracking tissue changes. The system employs a combination of energy-minimization registration techniques to achieve ac~ curate and robust(More)
We describe a method for mapping the functional regions of the brain using a tran-scranial magnetic stimulation (TMS) device. This device, when placed on a subject's scalp, stimulates the underlying neurons by generating focused magnetic eld pulses. A brain mapping is then generated by measuring responses of diierent motor and sensory functions to this(More)
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