摘要
目的:探讨自动管电流调制技术低剂量CT对结直肠病变中的诊断价值。材料与方法:对86例患者分别进行低剂量CT(n=46)及常规剂量CT成像(n=40)。低剂量CT组管电流采用预设噪声指数为10的自动管电流;常规剂量CT扫描管电流为400 m A。对比二组成像的图像质量、辐射剂量及对结直肠病变的检测效果。结果:常规剂量组图像质量评分稍高于低剂量组,但二组评分间无显著性差异(P>0.05)。低剂量CT组的CT容积剂量指数明显低于常规剂量CT组(P<0.001)。低剂量CT组与常规剂量CT组诊断结直肠病变的敏感度及特异度分别为93.8%、85.7%与96.7%、90%,二组对于结直肠疾病的诊断符合率之间无统计学差异(P>0.05)。结论:基于自动管电流调制技术的低剂量CT明显降低了患者的辐射剂量,获得的图像质量满足诊断要求,对于结直肠病变具有较高的诊断价值。
Purpose： Purpose： To evaluate the diagnostic value of automatic tube current modulation （ATCM） tech- nique-based low dose CT in colorectal lesions. Materials and Methods： 86 patients underwent low-dose CT examinations （n = 46） and conventional dose CT （ n = 40） examinations respectively. The ATCM scanning technology was used in low-dose CT group with a noise index of 10, and tube current was 400 mA in conventional dose CT group. The image quality, radiation dose and detective effect of colorectal lesions were compared between tbe two groups. Results： The image quality score of con- ventional dose CT images was slightly higher than that of the low-dose CT images, but the image quality scores between the two groups were no significant difference （ P 〉 0.05 ）. CT volume dose index in low-dose CT group was significantly lower than that in conventional dose CT group （ P 〈 0. 001 ）. The diagnostic sensitivity and specificity of low-dose CT group and conventional dose CT group were 93.8%, 85.7% and 96. 7%, 90% respectively. No significant difference between the two groups for the di- agnosis of colorectal disease was found （ P 〉 0. 05 ）. Conclusion： Low-dose CT can obviously reduce the radiation dose to the pa- tients, and can guarantee the image quality for the diagnosis. Low-dose CT had high diagnostic value for colorectal lesions.
出处
《现代医用影像学》
2016年第2期211-214,245,共5页
Modern Medical Imageology
