ICES/TACC Seminar: Dr. Gordon Kindlmann Brigham and Women's Hospital *%93Anisotropy Creases and Geodesic-Loxodromes: * *Recent Developments in the Analysis and Interpolation of Diffusion Tensor Images%94 ACES 6.304 Tuesday August 2 2007 3:30 p.m.

Contact Name: 
Jenna Whitney
Aug 2, 2007 3:30pm - 5:00pm



Affiliation: *Dr. Gordon Kindlmann Department of Radiology Brigham and W

omen''s Hospital Harvard Medical School

Date/Time: Tuesday August
2 2007 3:30 p.m.

Location: ACES 2.402

Host: Dr. Chandra

Bajaj ICES and Dr. Kelly Gaither TACC

Talk Title: %93Anisotropy C

reases and Geodesic-Loxodromes: Recent Developments in the Analysis and Int

erpolation of Diffusion Tensor

Talk Abstract:


iffusion Tensor MRI (DTI) has become a popular way of
non-invasively as

sessing micro-structural orientation and
organization in biological tis

sue especially the central nervous
system. In algorithms for processin

g DTI a common ingredients
is interpolating between two tensor values.
We describe a new
class of interpolation paths for tensors termed geo

which explicitly preserve clinically important tensor
attributes such
as mean diffusivity or fractional anisotropy while u

sing basic
differential geometry to interpolate tensor orientations. On
other hand simpler tensor interpolation methods can indirectly reveal features in fiber tract orientation through the differential

tructure of field. We describe a method of extracting surface
models fr

om DTI called anisotropy creases which is based on
traditional method

s of ridge and valley feature extraction applied
to the (non-linear) a

nisotropy field computed from a
second-order-continuous tensor field. R

esults from anisotropy
creases suggest that they may be used to form a

skeleton for the
major white matter features in the brain.