螺旋CT低剂量扫描对小儿肘关节外伤的诊断价值

The Diagnosis Value of Low-dose Spiral CT for Children Elbow Injury

目的探讨螺旋CT低剂量扫描对小儿肘关节外伤的诊断价值。方法随机选取肘关节外伤行CT扫描的患儿60例进行回顾性分析,分成低KV组(80KV、150mA)、低mA组(120KV、60mA)、低KV低mA组(80KV、60mA)和常规剂量组(120KV、150mA),扫描时记录了容积CT剂量指数(CTDIvol)、扫描长度,计算出平均剂量长度乘积(DLP),并按照骨折线的清晰度为图像评级,计算甲、乙、丙、丁级图像百分比,分别进行统计学分析。结果低KV组、低mA组、低KV低mA组DLP仅分别为常规剂量组的13.03%、13.62%和5.401%。各组图像均能满足临床诊断需要,无统计学差异。结论儿童肘关节外伤低剂量螺旋CT扫描技术,显著减少了射线剂量,并且完全能够满足临床的诊断要求。

Objective To determine The diagnosis value of Low-dose Spiral CT for children elbow injury. Methods Four groups which 15 cases in every group with paediatric elbow injury underwent spiral CT using different parameters： 80KV and 150mA, 120KV and 60mA, 80KV and 60mA,or 120KV and 150mA. The volume CT dose index （CTDIvol） and calculated the average dose-length produce （DLP）was recorded. Image quality of those four groups was compared and scored by two radiologists, and SPSS 13 was used to calculat the result. Results The low-KV scaning, low-mA scaning, or low-KV and low-mA scaning resulted in DLP reduction 86.97%,86.38%and 94.6% respectively compared to the conventional scanning method.There was no significant difference among four groups in diagnostic image quality. Conclusion The children elbow injury Low-dose CT technology may decrease significantly the radiation exposure and guarantee to meet the clinical diagnostic need.