低管电压、低浓度碘对比剂联合多模型迭代重建在Stanford B型主动脉夹层腔内修复术后随访复查中的价值

目的探讨低管电压、低浓度碘对比剂联合多模型迭代（ASIR-V）重建在Stanford B型主动脉夹层腔内修复术后（TEVAR）随访复查中的价值。方法收集128例受试者并采用随机数字表法分为实验组（100 kVp，320 mgI/mL，FBP和ASIR-V重建，n= 64）和对照组（120 kVp，350 mgI/mL，FBP重建，n=64）。主动脉图像质量主观评价采用5分制评分法，客观评价采用信噪比（SNR）和对比噪声比（CNR），同时比较两组的辐射剂量和碘剂量。结果两组主动脉在不同层面的CT值、SNR、CNR和主观图像质量评分差异无统计学意义（P>0.05）。在实验组，FBP和ASIR-V重建图像的噪声、SNR和CNR差异均有统计学意义（P < 0.05）。实验组辐射剂量和碘剂量比对照组低31.69%、24.14%（P < 0.05）。结论低管电压、低浓度碘对比剂联合ASIR-V算法可用于Stanford B型主动脉夹层患者腔内修复术后随访复查，可在保持良好图像质量的前提下降低辐射和减少碘剂用量。 

Value of low tube voltage,low iodine concentration contrast medium combined with adaptive statistical iterative reconstruction-V in the follow-up of Stanford type B aortic dissection after endovascular repair

ObjectiveTo explore the value of low tube voltage, low iodine concentration contrast medium (CM) and adaptive statistical iterative reconstruction-V (ASIR-V) protocol in the follow-up of Stanford type B aortic dissection after endovascular repair.Methods128 subjects were included and were randomly divided into the test (100 kVp, 320 mgI/mL, FBP and ASIR-V reconstruction, n=64) and control (120 kVp, 350 mgI/mL, FBP reconstruction, n=64) groups. Image quality of the aorta was evaluated subjectively by a 5 points grading scale and objectively by calculating the signal- and contrast-to-noise ratios (SNR and CNR, respectively). Radiation and CM doses were also evaluated.ResultsThe CT attenuation, SNR, CNR, and subjective image quality assessment of different levels of aorta didn't exhibit significant differences between the groups (P>0.05). In the test group, images reconstructed with FBP and ASIR-V showed significant differences in image noise, SNR and CNR (P < 0.05). The test group resulted in 31.69% less radiation (P < 0.05) and 24.14% less iodine weight than the control group (P < 0.05). Conclusions Protocol of low tube voltage, low iodine concentration CM and ASIR-V algorithm can be used in the follow-up of Stanford type B aortic dissection after endovascular repair. It can decrease the radiation and iodine doses while maintaining good image quality.