Matsumoto S, Shima F, Hasuo K, Uchino A, Mizushima A, Furukawa T, Matsuura Y, Gibo M, Masuda K, Fukui M
Department of Radiology, Faculty of Medicine, Kyushu University.
Nihon Igaku Hoshasen Gakkai Zasshi. 1992 Nov 25;52(11):1559-64.
Sixty-eight stereotactic radiofrequency (rf) thalamic lesions in 57 patients with movement disorders were evaluated by magnetic resonance (MR) imaging. Postoperative periods ranged from 5 days to 4 years and 9 months. All 68 rf lesions were clearly detected on T2-weighted images (T2WI). Changes in signal intensity on T2WI were classified into five patterns, as follows: Pattern I: lesions with three concentric zones consisting of an inner hypointense, middle hyperintense and outer hypointense zone (31 lesions); Pattern II: lesions consisting of an inner hypointense and outer hyperintense zone (4 lesions); Pattern III: lesions consisting of an inner hyperintense and outer hypointense zone (27 lesion); Pattern IV: lesions of a hyperintense area alone (2 lesions); Pattern V: lesions of a hypointense area alone (4 lesions). The outer hypointense rim in Patterns I and III is thought to represent hemosiderin deposition. The abnormal signal intensity on T2WI caused by rf ranged from 2 to 12 mm in diameter, and lesions in the late phase were smaller than lesions in the early phase.
对57例运动障碍患者的68个立体定向射频丘脑毁损灶进行了磁共振成像评估。术后时间从5天至4年9个月不等。所有68个射频毁损灶在T2加权像（T2WI）上均能清晰显示。T2WI上信号强度变化分为以下五种类型：I型：病灶有三个同心区，由内低信号、中间高信号和外低信号区组成（31个病灶）；II型：病灶由内低信号和外高信号区组成（4个病灶）；III型：病灶由内高信号和外低信号区组成（27个病灶）；IV型：仅为高信号区的病灶（2个病灶）；V型：仅为低信号区的病灶（4个病灶）。I型和III型中的外低信号环被认为代表含铁血黄素沉积。射频所致T2WI上的异常信号强度直径为2至12毫米，晚期病灶小于早期病灶。
