[Effects of Heart Rate on Myocardial Native T Value Acquired by 5s(3s)3s MOLLI Sequence].

Quantitative evaluation of myocardial native T value by measuring modified Look-Locker inversion recovery (MOLLI) method is clinically useful and is used for follow-up of various myocardial diseases. The heart rate during the scan can vary even in the same subjects. Therefore, it is important to know the effects of the heart rate on the native T value of the myocardium. In this study, we evaluated the effect of the heart rate on the T value in the 5s (3s) 3s scheme, time control data collection period of the MOLLI method, using phantom experiments and experiments of healthy volunteers. The 5s (3s) 3s scheme of the MOLLI method is considered to have little dependence on the heart rate, but the T value still varied up to about 7% depending on the heart rate, and was underestimated up to 8% during low heart rate using phantom experiments.