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目的探讨100kVp管电压下使用碘克沙醇(270 mg I/m1)行CTPA检查的可行性。方法 30例行CTPA检查的患者,随机平均分为试验组和对照组:分别采用100 kVp、碘克沙醇(270 mg L/ml)和120 kVp、欧内派克(350 mg I/m1),均使用对比剂40 ml。记录两组的CTDI_(vol)和DLP,并计算出CTDI_w和E。对图像质量进行目测评分和测量,对图像质量和辐射剂量进行统计学处理。结果两组患者的性别比、年龄、身高、体重及BMI均无统计学差异(P>0.05)。试验组使用10.8 g I,对照组使用14.0 g I,试验组用碘量降低了22.86%。试验组CTDI_(vol)、DLP、CTDI_w和E比对照组分别降低了约42%、45%、42%、和44%,差异具有统计学意义(P<0.05)。两组图像均符合诊断要求,图像质量目测评价和测量均无统计学差异(P>0.05)。结论使用100 kVp管电压、碘克沙醇(270 mg I/m1)行CTPA检查,采用滤波反投影(FBP)重建图像,图像质量可以满足临床诊断需要,既降低了辐射剂量、减少球管损耗,同时降低了对比剂用量和检杏成本。
Objective To investigate the feasibility of using CTPA with iodixanol (270 mg I / m1) under a tube voltage of 100 kVp. Methods Thirty patients with CTPA were randomly divided equally into experimental group and control group. The patients were treated with 100 kVp, iodixanol (270 mg L / ml), 120 kVp, 350 mg I / ml, Use contrast agent 40 ml. Record the two sets of CTDI_ (vol) and DLP, and calculate CTDI_w and E. The image quality was visually scored and measured, and the image quality and radiation dose were statistically processed. Results There was no significant difference in sex ratio, age, height, weight and BMI between the two groups (P> 0.05). The test group used 10.8 g I, the control group used 14.0 g I, the test group with iodine decreased 22.86%. The CTDI_ (vol), DLP, CTDI_w and E of the experimental group were reduced by about 42%, 45%, 42% and 44% respectively compared with the control group, the difference was statistically significant (P <0.05). The two groups of images were in line with the diagnostic requirements, visual evaluation and measurement of image quality were no significant difference (P> 0.05). Conclusions Using 100 kVp tube voltage and iodixanol (270 mg I / m1) underwent CTPA examination, the image was reconstructed by FBP to meet the needs of clinical diagnosis, which not only reduced the radiation dose but also reduced the tube loss , While reducing the amount of contrast agent and apricot costs.