NOrmalized MAgnetization Ratio (NOMAR) filtering for creation of tissue selective contrast maps.

Mark McIntosh,'s picture
PubMed URL: 
http://www.ncbi.nlm.nih.gov/pubmed/22499503
Author: 
McMahon MT
Author List: 
Liu G
Chan KW
Song X
Zhang J
Gilad AA
Bulte JW
van Zijl PC
McMahon MT
Journal: 
Magn Reson Med
PubMed ID: 
22499503
Pagination: 
516-23
Volume: 
69
Issue: 
2
Abstract: 
An MRI segmentation technique based on collecting two additional saturation transfer images is proposed as an aid for improved detection of chemical exchange saturation transfer agents. In this approach, the additional images are acquired at saturation frequencies of -12.5 and -50 ppm. Use of the ratio of these images allows differentiation of voxels with low magnetization transfer contrast (such as fat, cerebrospinal fluid, edema, or blood) from target tissue voxels using a global threshold determined by histogram analysis. We demonstrate that this technique can reduce artifacts, in vitro, in a phantom containing tubes with chemical exchange saturation transfer contrast agent embedded in either crosslinked bovine serum albumin or buffer, and in vivo for detecting diamagnetic CEST (DIACEST) liposomes injected into mice.
Published Date: 
February, 2013

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