Wisconsin Alumni Research Foundation

Catherine Judith Moran

Walter Francis Block

Scott Brian Reeder

Ethan K Brodsky

A method for producing an image of a subject with a magnetic resonance imaging (MRI) system is provided. Image data is acquired at a sequence of multiple echo times occurring within two or more repetition times (TRs). Odd-numbered echoes are sampled during odd-numbered TRs, and even-numbered echoes are sampled during even-numbered TRs. Images are reconstructed and used to calculate the respective signal contributions of two or more chemical species using, for example, an IDEAL separation technique. The respective signal contributions are then used to produce images that depicts substantially only one of the chemical species. For example, separated water and fat images may be produced.

Method for accelerated high resolution chemical species separation for magnetic resonance imaging

A three-dimensional projection reconstruction pulse sequence acquires two half echoes in a steady state free precession (SSFP) scan. A method for combining the two echoes to suppress either fat or water in the reconstructed image is described and includes shifting the phase of one echo and combining them in a regridding process used to transform the radial data to a Cartesian grid prior to image reconstruction. Images having either fat or water substantially suppressed are then produced by applying a phase difference mask to images reconstructed from the regridded data. These images are then further processed using information of the phase differences between the two half echoes. In this manner, more consistent and accurate suppression is achieved.

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Palo Alto, CA, United States of America

Catherine Judith Moran