Ramsey R G, Zacharias C E
AJR Am J Roentgenol. 1985 Jun;144(6):1131-5. doi: 10.2214/ajr.144.6.1131.
Magnetic resonance (MR) imaging of the spine after radiation treatment in four patients demonstrated well defined areas of increased signal intensity in the vertebral bodies on short or T1-weighted sequences. Radiation doses of 4000-5790 rad (40-57.9 Gy) were administered to the mediastinum, rectum, and spine. The interval between radiation treatment and MR imaging was 2 months to 10 years. The abnormally increased areas of signal intensity seen on MR images were best demonstrated in the midsagittal plane and were easily differentiated from involvement by tumor. The alteration in signal intensity probably was secondary to replacement of marrow by fatty tissue and corresponded closely with radiation therapy portals.
对4例患者进行放射治疗后脊柱的磁共振（MR）成像显示，在短或T1加权序列上椎体中有界限清晰的信号强度增加区域。对纵隔、直肠和脊柱给予4000 - 5790拉德（40 - 57.9戈瑞）的放射剂量。放射治疗与MR成像之间的间隔为2个月至10年。MR图像上可见的信号强度异常增加区域在矢状中平面显示最佳，且易于与肿瘤累及相鉴别。信号强度的改变可能继发于骨髓被脂肪组织替代，并且与放射治疗野密切对应。
