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

Guanshu Liu, Kannie W.Y. Chan, Xiaolei Song, Jiangyang Zhang, Assaf A. Gilad, Jeff W.M. Bulte, Peter C.M. Van Zijl, Michael T. McMahon

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.

Original languageEnglish (US)
Pages (from-to)516-523
Number of pages8
JournalMagnetic resonance in medicine
Issue number2
StatePublished - Feb 2013


  • MRI segmentation
  • chemical exchange saturation transfer (CEST)
  • magnetization transfer (MT)

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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