Sugimoto H, Sakai O, Shinozaki T, Ohsawa T, Kimura T
Department of Radiology, Jichi Medical School, Tochigi-Ken, Japan.
J Comput Assist Tomogr. 1994 Jan-Feb;18(1):119-25. doi: 10.1097/00004728-199401000-00024.
This article describes the effect of the water fraction in the selection of the optimal TI value in a STIR sequence. This effect has been given little consideration in previous studies.
Therefore, using both STIR combined with the Dixon method (opposed-phase STIR) and conventional STIR (in-phase STIR), we have investigated the effect of the water fraction in the selection of an optimal TI value for the STIR sequence.
Our findings have indicated that the water protons rather than the olefinic protons (-CH = CH-) play a major role in the opposed-phase effect in vivo.
Thus, it has been concluded that the most effective fat suppression can be achieved when the intravoxel phase cancellation effect between the water and lipid protons is maximal, rather than when the longitudinal magnetization of the lipid protons is minimal.
本文描述了水分数在短TI反转恢复（STIR）序列中最佳TI值选择方面的影响。以往研究对此影响关注较少。
因此，我们采用结合狄克逊法的STIR（反相位STIR）和传统STIR（同相位STIR），研究了水分数在为STIR序列选择最佳TI值方面的影响。
我们的研究结果表明，在体内反相位效应中起主要作用的是水质子而非烯质子（-CH = CH-）。
因此得出结论，当水和脂质质子之间的体素内相位抵消效应最大时，而非脂质质子的纵向磁化强度最小时，可实现最有效的脂肪抑制。
