Cremona A, Messineo D, Trinci M, Marini M
Radiol Med. 1996 Nov;92(5):530-4.
Magnetic Resonance Imaging (MRI) is a useful tool for demonstrating muscle changes in patients with inflammatory myopathies. We investigated the diagnostic capabilities of low field (0.2 T) MRI with a dedicated coil in a series of patients with an unquestionable clinical diagnosis of inflammatory myopathy. Infiltrating processes or muscle swelling are depicted as low-signal areas on T1-weighted SE images and as high-signal areas on T2-weighted SE and short time inversion recovery (STIR) images. Fatty infiltration appears as a high-signal area within muscles on T1-weighted SE images. T2-weighted SE and STIR sequences are highly sensitive in demonstrating infiltrating processes or muscle swelling. The signal-to-noise ratio was higher on T2-weighted SE than on STIR images; on the other hand, fast STIR sequences can effectively reduce scan times. To conclude, low field MRI is a useful tool in the study of inflammatory myopathies thanks to its noninvasiveness and to the good depiction of muscle inflammation provided by T2-weighted SE and STIR images.
磁共振成像（MRI）是用于显示炎性肌病患者肌肉变化的一种有用工具。我们使用专用线圈研究了低场（0.2 T）MRI对一系列临床诊断明确的炎性肌病患者的诊断能力。浸润性病变或肌肉肿胀在T1加权SE图像上表现为低信号区，在T2加权SE图像和短时反转恢复（STIR）图像上表现为高信号区。脂肪浸润在T1加权SE图像上表现为肌肉内的高信号区。T2加权SE和STIR序列在显示浸润性病变或肌肉肿胀方面高度敏感。T2加权SE图像上的信噪比高于STIR图像；另一方面，快速STIR序列可有效缩短扫描时间。总之，低场MRI因其无创性以及T2加权SE和STIR图像对肌肉炎症的良好显示，是研究炎性肌病的一种有用工具。
