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Fat and water separation in balanced steady-state free precession using the Dixon method

✍ Scribed by Teng-Yi Huang; Hsiao-Wen Chung; Fu-Nien Wang; Cheng-Wen Ko; Cheng-Yu Chen

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
168 KB
Volume
51
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

In this work the feasibility of separating fat and water signals using the balanced steady‐state free precession (SSFP) technique is demonstrated. The technique is based on the observation (Scheffler and Hennig, Magnetic Resonance in Medicine 2003;49:395–397) that at the nominal values of TE = TR/2 in SSFP imaging, phase coherence can be achieved at essentially only two orientations (0° and 180°) relative to the RF pulses in the rotating frame, under the assumption of TR << T~2~, and independently of the SSFP angle. This property allows in‐phase and out‐of‐phase SSFP images to be obtained by proper choices of the center frequency offset, and thus allows the Dixon subtraction method to be utilized for effective fat–water separation. The TR and frequency offset for optimal fat–water separation are derived from theories. Experimental results from healthy subjects, using a 3.0 Tesla system, show that nearly complete fat suppression can be accomplished. Magn Reson Med 51:243–247, 2004. © 2004 Wiley‐Liss, Inc.

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