Gunma Prefectural Cardiovascular Center, 3-12 Kamiizumimachi, Maebashi-shi, Gunma, Japan.
Radiol Phys Technol. 2020 Dec;13(4):405-413. doi: 10.1007/s12194-020-00594-z. Epub 2020 Nov 5.
Image data for T1 mapping are generally acquired during mid-diastole period. However, T1 mapping tends to fail for patients with high heart rate or atrial fibrillation because of short or irregular R-R interval. Focusing on the evidence that the timing of systole is more stable than that of diastole from the R wave, we compared systolic T1 mapping with conventional diastolic T1 mapping for all participants (n = 58) by visual scoring of T1 calculation error. The systolic scores were significantly better than the diastolic scores (p < 0.05). This advantage of the systolic scores was confirmed selectively for patients with atrial fibrillation (p < 0.05, n = 19). The successful number of nonrigid image registration alignment for extracellular volume fraction (ECV) analysis also increased significantly for systolic images compared with diastolic images (p < 0.05). Thus, systolic T1 mapping improves the accuracy of T1 values and ECV analysis.
图像数据的 T1 映射通常在舒张中期采集。然而，由于 RR 间隔短或不规则，T1 映射往往会在心率较高或心房颤动的患者中失败。鉴于从 R 波来看，收缩期的定时比舒张期更稳定，我们通过 T1 计算误差的视觉评分，比较了所有参与者（n=58）的收缩期 T1 映射与传统的舒张期 T1 映射。收缩期评分明显优于舒张期评分（p<0.05）。这种收缩期评分的优势在心房颤动患者中得到了选择性证实（p<0.05，n=19）。与舒张期图像相比，用于细胞外容积分数（ECV）分析的非刚性图像配准对齐的成功次数也显著增加（p<0.05）。因此，收缩期 T1 映射提高了 T1 值和 ECV 分析的准确性。
