MedSeC Project: Apparent Diffusion Coefficient Analysis

Approach
Initial CT (left) and MR image (right) of a patient who suffered a stroke. The MR image was acquired with a special MR technique (navigated diffusion imaging) that is able to display ischemic regions at a time when standard T2-weighted images do not detect the infarct (see below).

Measurement techniques

 
 
Problem: 

diffusion sequences are extremely motion sensitive

 Solutions: 
  • correction of the motion artifacts using navigator echo (see corrected image above)
  • rapid imaging (echo planar imaging, EPI, see below)

Acute Infarct

 
 
T2-weighted image
(b = 0 s/mm2)		 Diffusion-weighted image 
(b = 1000 s/mm2)		 Calculated map of apparent
diffusion coefficient (ADC)
 Spinecho-EPI
 
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