磁共振弥散加权成像诊断眼眶肿瘤的研究

摘要

Objective To analyze the feature of diffusion weighted imaging(DWI) of orbital tumor, to evaluate the value of the DWI in the differential diagnosis of the malignant and innocence for the orbital tumor. Methods DWI was performed on 23 orbital tumor cases,the apparent diffusion coefficient(ADC) was measured with the data analyzed software. In all the cases,there were 22 cases with the pathologic diagnosis, 1 case in the diagnosis of venous aneurysm without pathologic diagnosis. Results The image of orbital tumor in DWI could meet the request of imaging. There are 11 orbital tumor with innocenced 0 cases confirmed by the pathologic diagnosis) ,the ADC was (1. 81 + 0. 45)×10-3 mm2/s, the signal of tumor gradually decrease from the b0 to b1000; There are 12 orbital tumor with innocence(all the cases confirmed by the pathologic diagnosis) , the ADC was (0. 79 + 0. 23)× 10-3 mm2/ s,the signal of tumor had no attenuation from the b0 to bl000. Conclusion DWI could supply more information for the imaging diagnosis of the orbital tumor,it also could help to distinguish the malignant or innocence for the orbital tumor.%目的 分析眼眶肿瘤的磁共振弥散加权成像特点,及其在眼眶肿瘤良、恶性鉴别诊断中的价值.方法 23例眼眶肿瘤患者分别行磁共弥振散加权成像(diffusion-weighted imaging,DWI),利用数据测量软件进行表观弥散系数(apparent diffusion coefficient,ADC)的测量.23例患者中,22例有病理诊断资料,1例临床诊断为静脉瘤的患者未进行病理检查.结果 眼眶肿瘤的DWI图像信噪比良好,能满足成像要求.良性肿瘤11例(病理诊断10例),ADC值为(1.81±0.45)×10-3 mm2/s,病灶的b0至b1 000的信号逐渐降低;病理诊断为恶性肿瘤12例,ADC值为(0.79±0.23)×10-3 mm2/s,病灶的b0至b1 000的信号无明显降低.结论 DWI可以增加眼眶肿瘤的影像学诊断信息,有助于鉴别诊断眼眶良、恶性肿瘤.