Virta A, Komu M, Lundbom N, Kormano M
Department of Diagnostic Radiology, University of Turku, Finland.
Acad Radiol. 1998 Feb;5(2):104-10. doi: 10.1016/s1076-6332(98)80130-x.
The authors evaluated the value of T1 rho in relation to T1 and T2 in the characterization of human muscles.
The authors studied the effect of muscle type (anterior tibial [AT] and gastrocnemius [GC]), sex, and age on 1/T1 and 1/T2 at 0.1 T and on 1/ T1 rho at locking-field B1s (spin-locking radio-frequency magnetic induction field) of 10-160 microT in 38 healthy volunteers. The contrast-to-noise ratio (CNR) between muscle and fat was evaluated with different T1-, T2-, and T1 rho-weighted magnetic resonance (MR) sequences.
The 1/T1, 1/T2, and 1/T1 rho were slightly higher in AT than in GC muscles. The 1/T2 and 1/T1 rho of AT muscles showed a sex dependence, whereas no correlation with age was found. The CNR of the T1 rho-weighted images did not markedly differ from that of the T1- and T2-weighted images.
T1 rho is as sensitive as T2 to the composition of muscle, whereas T1 is less sensitive. In MR imaging of normal muscle, T1 rho and T2 provide a relatively similar tissue contrast.
作者评估了T1ρ相对于T1和T2在人体肌肉特征描述中的价值。
作者研究了肌肉类型（胫前肌[AT]和腓肠肌[GC]）、性别和年龄对38名健康志愿者在0.1T场强下的1/T1和1/T2以及在10 - 160微特斯拉的锁定场B1s（自旋锁定射频磁感应场）下的1/T1ρ的影响。使用不同的T1加权、T2加权和T1ρ加权磁共振（MR）序列评估肌肉与脂肪之间的对比噪声比（CNR）。
AT肌的1/T1、1/T2和1/T1ρ略高于GC肌。AT肌的1/T2和1/T1ρ表现出性别依赖性，而未发现与年龄相关。T1ρ加权图像的CNR与T1加权和T2加权图像的CNR无明显差异。
T1ρ对肌肉成分的敏感性与T2一样，而T1的敏感性较低。在正常肌肉的MR成像中，T1ρ和T2提供相对相似的组织对比度。
