64 排螺旋 CT 低剂量检查在跟骨骨折中的应用

目的使用64排螺旋CT对跟骨骨折患者进行低剂量检查，评价低剂量64排螺旋CT检查在跟骨骨折的应用价值。方法将2012年1月～2013年8月于义乌市中心医院骨科就诊的80例跟骨骨折患者随机分配到常规剂量组、低kV组和低mA组以及低剂量组进行64排螺旋CT检查，每组各20例。记录平均容积剂量指数和扫描长度，计算有效剂量，并对图像进行成像质量评分。结果四组间有效剂量的比较，差异有统计学意义（F=0．053，P〈0．05），常规剂量组、低kV组、低mA组的有效剂量值高于低剂量组，可认为低剂量组的检查辐射剂量低于其他三组；各组问图像质量评分的比较，差异无统计学意义（F=0．0424、0．0396、0．0431、0．0387，P〉0．05），可以认为四组的成像质量没有差别。结论以低剂量进行跟骨骨折的64排螺旋CT检查是可行的，在保证了诊断质量的前提下明显降低了检查剂量。

Application of 64 multidetector CT low-dose scan on calcaneus fracture

Objective To explore the application value of low-dose scan with 64 multideteetor CT （64-MDCT） on cal- eaneus fracture. Methods 80 patients with calcaneus fracture were randomly divided into regular dose group, low kV group, low mA group and low dose group to recieve 64-MDCT examination during January 2012 to August 2013. CT- Dlvol and scan length were recorded, effective dose were calculated. Results The examination dose of low dose group were lower than the other three groups （F = 0.053, P 〈 0.05）, there were no difference in image quality of the four groups （F = 0.0424, 0.0396, 0.0431, 0.0387, P 〉 0.05）. Conclusion It is feasible that using the 64-MDCT examine pa- tients with calcaneus fracture by low-dose way, which can ensure the diagnostic quality and reduce the exposure dose.