Abstract
CHESS pulse can suppress the signal originating from aliphatic fat protons but cannot suppress the signal from olefinic fat protons, which is near the resonance frequency of water protons. Adipose tissue contains various fat species; aliphatic fat comprises about 90% and olefinic fat about 10% of adipose tissue. Thus, CHESS pulse cannot be used to suppress the signal from adipose tissue completely. The purpose of this study was to find a method to suppress the signal from adipose tissue completely. To achieve this, the Fatsat train pulse, created with an arbitrary flip angle (FA) and insensitive to B1 inhomogenity, was used. Because B1 inhomogenity is larger on higher field MRI, the fat suppression RF pulse needs to be B1‐insensitve. To find a way to suppress the signal from adipose tissues, the fraction of olefinic fat was investigated by varying the excitation frequency of the Fatsat train pulse. The presence of olefinic fat comprising about 10% of abdominal adipose tissue was identified. Complete fat suppression could be achieved by partial (10%) inversion of longitudinal aliphatic fat magnetization and by canceling out the two fat magnetizations. This technique may also be applied to several pulse sequences. © 2013 Wiley Periodicals, Inc. Concepts Magn Reson Part A 42A: 109‐115, 2013.
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