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螺旋CT检查是小腿病变进一步检查的有效手段之一,随着临床应用的增多群体辐射剂量也明显增加〔1〕。据报道诊断X线所产生的世界人口年均有效剂量占人工辐射源总年均有效剂量的95%以上,一次常规CT扫描的剂量大约相当于拍摄300张胸部X线平片剂量,每降低10mAs的管电流相当于减少7~
Spiral CT examination is an effective means of further examination of calf lesions, with the increase of clinical application of group radiation dose was significantly increased 〔1〕. It is reported that the average annual effective dose of the world’s population generated by the diagnosis of X-ray accounts for more than 95% of the total annual effective dose of artificial radiation sources. The dose of a conventional CT scan is about the equivalent of taking 300 chest X-ray films, The tube current equivalent to reduce 7 ~