[Analysis of Myocardial T 1 Value for Japanese Healthy Subjects with Non-contrast Myocardium T 1 Mapping].

The purpose of this study was to analyze the native T ₁ value of myocardium and the relationship between myocardial native T ₁ value and gender, age and myocardial areas in Japanese. The subject of this study was 145 Japanese healthy subjects who underwent cardiac magnetic resonance imaging (MRI) at medical examination. MRI scanner was Ingenia 1.5T (Philips Healthcare, Best, The Netherlands). T ₁ mapping was acquired with modified look-locker inversion recovery method using IR pulse. The native T ₁ value of all subjects was 983.5±34.8 ms, and we were able to acquire the reference value of the native T ₁ value at our hospital. The native T ₁ value was significantly higher in females than in males. There was variation in native T ₁ value among the myocardial areas, and the native T ₁ value was significantly higher in the septum than in the lateral region. In the future, collaborative research in multicenter is necessary to obtain the reference value of Japanese.