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首页> 外文期刊>Applied Magnetic Resonance >Frequency-Selective Fat Suppression Radiofrequency Pulse Train to Remove Olefinic Fats
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Frequency-Selective Fat Suppression Radiofrequency Pulse Train to Remove Olefinic Fats

机译：频率选择性脂肪抑制射频脉冲序列去除烯烃脂肪

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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. The Fatsat train pulse, created with an arbitrary flip angle and insensitive to B1 inhomogeneity, was used. Because B1 inhomogeneity is larger on higher field magnetic resonance imaging, the fat suppression radiofrequency pulse needs to be B1-insensitive. To investigate a percentage of olefinic fat in adipose tissues, the excitation frequency of the Fatsat train pulse was varied from -240 to +400 Hz and the images and fat-suppressed images were obtained. The presence of olefinic fat comprising about 10 % of abdominal adipose tissue was identified. The result agreed with some previous papers. Complete fat suppression could be achieved by partial (10 %) inversion of longitudinal aliphatic fat magnetization and by canceling out the two fat magnetizations. The flip angle was identified to about 95°. In conclusion, the cause that the signal from adipose tissues cannot be suppressed completely has been found. Improved images that signals from adipose tissues were suppressed completely have been demonstrated. This technique can also be applied to several pulse sequences.
机译：CHESS脉冲可以抑制源自脂肪族脂肪质子的信号，但不能抑制来自烯属脂肪质子的信号，该信号接近水质子的共振频率。脂肪组织中含有各种脂肪;脂肪组织占脂肪组织的约90％，烯烃脂肪约占10％。因此，CHES脉冲不能用于完全抑制来自脂肪组织的信号。这项研究的目的是找到一种完全抑制来自脂肪组织的信号的方法。使用具有任意翻转角且对B1不均匀性不敏感的Fatsat火车脉冲。由于在高场磁共振成像中B1不均匀性较大，因此脂肪抑制射频脉冲必须对B1不敏感。为了研究脂肪组织中烯烃脂肪的百分比，Fatsat脉冲的激发频率在-240至+400 Hz之间变化，并获得了图像和抑制脂肪的图像。确定了包含约10％腹部脂肪组织的烯烃脂肪的存在。结果与以前的一些论文一致。完全脂肪抑制可通过部分（10％）的纵向脂肪族脂肪磁化强度反转和抵消两个脂肪磁化强度来实现。翻转角被确定为大约95°。总之，已经发现了不能完全抑制来自脂肪组织的信号的原因。已经证明了完全抑制了来自脂肪组织的信号的改进图像。该技术也可以应用于几个脉冲序列。

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