MSCT三维重建对眼部异物的定位价值

目的评价多层螺旋CT(multislice spiral computed tomography,MSCT)三维重建对眼部异物的定位价值。方法选取2013年8月到2015年12月期间来我院就诊的可疑眼部异物患者74例(74只眼),进行眼眶DR拍摄和MSCT三维重建,比较两种方法眼部异物的检出率;眼眶-DR法拍摄阳性患者行角膜-DR定位法,测量出异物与水平面、矢状面、角巩膜缘距离。结果 74例患者经手术确诊69例存在眼部异物,MSCT三维重建法检测异物28例,检出率37.84%;眼眶DR法检出异物21例,检出率28.38%,经比较差异有统计学意义(P=0.003);21例眼眶DR法检测出异物的患者MSCT均能检测出。以眼眶DR法测量值-MSCT三维重建法测量值为检验统计量,异物点钟位(0.03±0.32)mm(t=1.296,P0.05),异物与矢状面距离(0.03±0.41)mm(t=0.896,P0.05),异物与水平面距离(0.05±0.35)mm(t=1.564,P0.05),异物与角巩膜缘距离(0.12±0.81)mm(t=1.182,P0.05)。结论 MSCT三维重建眼部异物检出率高,定位较为准确,对于眼部异物定位具有重要价值。

The Value of Three-dimensional Reconstruction of Multislice Spiral CT Scan in the Localization of Ocular Foreign Body

Objective To evaluate the value of three-dimensional reconstruction of multislice spiral CT scan in the localization of ocular foreign body. Methods 74 cases (74 eyes) suspicious patients with ocular foreign body were selected and accepted DR film and MSCT three-dimensional reconstruction respectively from August 2013 to December 2015, to compare the detection rate of two methods. The location of foreign body and the distances of foreign body with sagittal, horizontal and limbus were measured. Results 69 cases were confirmed with ocular foreign body by surgery in the total 74 cases, 28 cases were diagnosed by three-dimensional reconstruction of multislice spiral CT scan, withthe detection rate of 37.84%, while 21 cases were diagnosed by orbital digital radiography, with the detection rate of 28.38%. The difference was statistical significance(P=0.003), the location of foreign body and the distances of foreign body with sagittal, horizontal and limbus measured by three-dimensional reconstruction of multislice spiral CT scan were similar to those measured by orbital digital radiography. The differences had no statistical significance, the location of foreign body at (0.03±0.32) mm (t=1.296, P>1.296), the sagittal distances of foreign body were (0.03±0.41) mm (t=0.896, P> 0.896), the horizontal distances of foreign body were (0.05±0.35)mm (t=1.564, P>1.564), the distances between foreign body were (0.12±0.81) mm (t=1.182, P>1.182) to the limbus. Conclusion The detection rate of ocular foreign body by MSCT three-dimensional reconstruction was high and with high accuracy rate, which had important value for the localization of ocular foreign body.