膈下动脉CT成像中碘总量固定不同碘流率对成像的影响

目的 比较碘总量固定情况下不同碘流率(IDR)对膈下动脉(IPA) CT成像的影响.方法 选取行腹部CT血管成像(CTA)患者60例,碘总量为 350 mgI/kg,随机分为A、B、C 组,每组20例.A组:碘浓度300 mgI/mL,注射流率5 mL/s, IDR 1 500 mgI/s;B组:碘浓度350 mgI/mL,注射流率4.3 mL/s,IDR 1 505 mgI/s;C组:碘浓度370 mgI/mL,注射流率4.3 mL/s,IDR 1 591 mgI/s.记录各组IPA各级血管的显示情况及图像质量,测量各组RIPA一级血管及二级血管的CT值.结果 A组和B组IPA各级血管的显示、图像质量、RIPA一级和二级血管的CT值差异无统计学意义(P>0.05);C组IPA三级血管及其以上分支的显示及图像质量高于A组和B组,差异有统计学意义(P<0.05);C组RIPA一级和二级血管的CT值高于A组和B组,差异有统计学意义(P<0.05).结论 碘总量固定情况下,IDR增加使得IPA强化程度增高,图像质量提高,有助于IPA三级及其以上分支能更好地显示.

Impacts of different iodine deliver rates with constant total iodine load on CT images of inferior phrenic artery

Objective To explore the impacts of different iodine deliver rate (IDR) with constant total iodine load on CT images of inferior phrenic artery (IPA). Methods A total of 60 patients abdominal CT angiography were randomly divided into 3 groups (20 patients in each group): group A: iodine concentration 300 mgI/mL, injection rate 5 mL/s, IDR 1 500 mgI/s; group B: iodine concentration 350 mgI/mL, injection rate 4.3 mL/s, IDR 1 505 mgI/s; group C: iodine concentration 370 mgI/mL, injection rate 4.3 mL/s, IDR 1 591 mgI/s, and the total iodine load was 350 mgI/kg. The display and image quality of different branches of IPA in each group were recorded. The CT values of the first and second grade of right IPA (RIPA) were measured. Results There was no statistical significance in the image quality of different branches and CT values of RIPA between group A and B (P>0.05). The display of grade three and above branches of IPA and image quality of group C were significantly higher than those of group A and B (P<0.05). The CT values of the first and second grade of RIPA in group C were higher than those in group A and B (P<0.05). Conclusion When the total iodine load is kept constant, the increase of IDR can obviously promote the IPA enhanced degree and image quality, which is conducive to the display of grade three and above branches of IPA.