低浓度对比剂和低管电压结合适应性统计迭代技术对腹部动脉血管成像质量的影响

发布时间：2018-06-25 19:33

本文选题：主动脉 + 腹　；参考：《中国医学影像学杂志》2015年04期

【摘要】：目的探讨低浓度对比剂和低管电压结合适应性统计迭代(ASIR)技术对腹部动脉血管成像(CTA)质量的影响。资料与方法前瞻性收集139例行全腹动态增强检查、体重指数(BMI)22 kg/m2的患者,将其分为A组78例(管电压80 k Vp+50%ASIR,对比剂碘浓度270 mg I/ml)及B组61例(管电压120 k Vp,对比剂碘浓度350 mg I/ml)。评价两组右肾动脉的主观质量评分,对两组评分进行一致性检验;比较两组图像容积CT剂量指数(CTDIvol),腹主动脉主干及分支、右侧竖脊肌CT值,血管对比噪声比(CNR),右侧竖脊肌图像噪声(SD)及总碘量。结果两组图像的主观评分一致性很好(Kappa值0.80),A、B组图像右肾动脉评分分别为(4.60±0.51)分和(3.81±0.76)分,差异有统计学意义(Z=-6.86,P0.01)。A、B组CTDIvol分别为(5.56±4.21)m Gy、(7.11±1.54)m Gy,差异有统计学意义(t=-9.89,P0.01);两组各动脉CT值均大于400 HU,A组腹主动脉主干及分支的CT值、CNR均高于B组(P0.05);两组图像SD值差异无统计学意义(P0.05);A、B组总碘量分别为270 mg、350 mg,A组较B组每位患者总碘量降低了22.86%。结论对于BMI22 kg/m2的患者,低浓度对比剂、低管电压结合ASIR技术能够提高腹部CTA图像质量,并有效降低辐射剂量及对比剂碘含量。
[Abstract]:Objective to investigate the effect of low concentration contrast agent and low tube voltage combined with adaptive statistical iteration (ASIR) on the quality of abdominal artery angiography (CTA). Materials and methods 139 patients with total abdominal dynamic enhancement and body mass index (BMI) of 22 kg/m2 were collected prospectively. They were divided into two groups: group A: 78 cases (tube voltage 80 kV P 50 ASIRL, contrast agent iodine concentration 270 mg I / ml) and group B 61 cases (tube voltage 120 kVP, contrast agent iodine concentration 350 mg I / ml). To evaluate the subjective quality of the right renal artery in the two groups, to test the consistency of the two groups, to compare the CT dose index (CTDIvol), the main and branches of the abdominal aorta, and the CT value of the right spinal muscle, and to compare the image volume CT dose index (CTDIvol) of the two groups. Vascular contrast noise ratio (CNR), image noise (SD) and total iodine content of the right vertical spinal muscle. Results the subjective score consistency of the two groups was very good (Kappa value 0.80). The right renal artery score in group A and B was (4.60 卤0.51) and (3.81 卤0.76), respectively. There was significant difference in CTDIvol (5.56 卤4.21) mGy and (7.11 卤1.54) mGy in group A (P 0.01), the CT value of each artery in group A was higher than that in group B (P 0.05), and there was no significant difference in image SD between the two groups (t = -9.89, P 0.01), and the CT values of main and branches of abdominal aorta in group A were higher than those in group B (P0.05). Significance (P0.05) the total iodine content of group A was decreased by 22.86 compared with that of group B (270 mg / 350mg / g) respectively. Conclusion for patients with BMI22 kg/m2, low concentration contrast agent and low tube voltage combined with ASIR technique can improve the quality of abdominal CTA images, and effectively reduce the radiation dose and iodine content of contrast agent.
【作者单位】：大连医科大学附属第一医院放射科;
【分类号】：R816.2

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