心筋遅延造影MRIにおけるTI scout像(look-locker)の 特徴とIR-T₁TFE法とのnull pointの整合性について

抄録

Myocardial delayed enhancement imaging must regulate inversion time (TI) so that the signal intensity of the normal myocardium becomes null, and look-locker imaging is performed prior to myocardial delayed enhancement imaging to determine the optimal TI. We think that the null point measured by look-locker imaging may change with the adjustment of some imaging parameters like the IR-T₁TFE sequence used in myocardial delayed enhancement imaging. Therefore, the purpose of this study is to examine the change of the null point with the adjustment of some imaging parameters for look-locker imaging and to study factors affecting the consistency of the null point with the IR-T₁TFE sequence. The null point of both sequences of look-locker imaging and the IR-T₁TFE sequence changed with the RR interval and with the number, FA, and interval of RF pulses applied within the RR interval. To match the null points in both sequences, it is necessary to make the RR intervals the same and to match the number, FA, and interval of RF pulses applied to within 1 heartbeat.