Li X, Wang C, Zhou Y
Department of Radiology, Tongji Hospital, Tongji Medical University, Wuhan 430030.
J Tongji Med Univ. 1999;19(1):72-6. doi: 10.1007/BF02895603.
To explore the changes in MR findings of the bone marrow of vertebral bodies after radiation therapy, 55 subjects who had been on irradiation treatment were studied. Irradiation dosage ranged from 2100 cGy to 7500 cGy. The interval between radiotherapy and MR examination varied from 7 weeks to 20 years. On T1WI images (T1WI) signal intensity increase of the bone marrow of those vertebral bodies was apparent. The areas with altered signal intensity rendered well-defined margins corresponding to the field of irradiation. The similar finding was found on T2WI. On STIR or T1WI with fat suppression, the signal intensity of the areas was decreased. It is concluded that the changes of signal intensity on SE or STIR sequence is believed to be secondary to diffuse fatty infiltration and the results of replacement of the normal bone marrow by relatively increased yellow bone marrow.
为探讨放射治疗后椎体骨髓磁共振成像（MR）表现的变化，对55例接受过放射治疗的患者进行了研究。放射剂量范围为2100厘戈瑞至7500厘戈瑞。放疗与MR检查之间的间隔时间从7周至20年不等。在T1加权像（T1WI）上，这些椎体骨髓的信号强度明显增加。信号强度改变的区域边界清晰，与照射野相对应。在T2WI上也发现了类似的表现。在短TI反转恢复序列（STIR）或脂肪抑制T1WI上，这些区域的信号强度降低。结论是，自旋回波（SE）序列或STIR序列上信号强度的变化被认为是弥漫性脂肪浸润的结果，是相对增多的黄骨髓取代正常骨髓的结果。
