不同碘流率对肾动脉CTA图像最佳触发阈值的影响

发布时间：2019-05-07 17:24

【摘要】：目的利用智能追踪(Smart Prep)技术探讨不同碘流率时肾动脉CTA的最佳触发阈值及其对肾CTA图像质量的影响。方法随机选择临床需行肾动脉CTA检查的患者420例,利用Smart Prep技术进行扫描。将所有患者随机平均分入A~D组,碘流率分别为0.90、1.11、1.20和1.48gI/s。每组随机平均分为7个亚组,分别按照不同阈值扫描,各亚组触发阈值分别为140~150 HU、150~160 HU、160~170 HU、170~180 HU、180~190 HU、190~200HU和200~210HU。采用5分制评分评价图像质量。分析各组的最佳阈值亚组,并进一步比较各最佳阈值亚组的图像质量的差异。结果 A~D组中,最佳触发扫描阈值范围分别为170~190 HU、160~190 HU、170~180 HU和160~180HU。触发阈值为170~180HU时能够满足不同碘流率时肾动脉CTA的成像要求。各最佳阈值亚组间肾动脉CTA图像质量差异无统计学意义。结论不同碘流率配合最佳扫描触发阈值可获得优良的肾CTA图像。
[Abstract]:Aim to investigate the optimal trigger threshold of renal artery CTA and its effect on the quality of renal CTA images by intelligent tracking (Smart Prep) technique in different iodine flow rates. Methods A total of 420 patients with renal artery CTA were randomly selected and scanned by Smart Prep technique. All patients were randomly divided into A / D group with iodine flow rates of 0.90, 1.11, 1.20 and 1.48 GI / s, respectively. Each group was randomly divided into 7 subgroups, which were scanned according to different threshold values. The trigger thresholds of each subgroup were 140 and 150 HU,150~160 HU,160~170 HU,170~180 HU,180~190 HU,190~200HU and 200 脳 210 HU, respectively. The image quality was evaluated by 5-point system. The optimal threshold subgroup of each group was analyzed, and the difference of image quality among each optimal threshold subgroup was further compared. Results in group A, the optimal threshold range of trigger scan was 170 ~ 190 HU,160~190 HU,170~180 HU and 160 ~ 180 HU, respectively. When the trigger threshold is 170~180HU, the imaging requirements of renal artery CTA with different iodine flow rates can be satisfied. There was no significant difference in the image quality of renal artery CTA among the optimal threshold subgroups. Conclusion better renal CTA images can be obtained with different iodine flow rates and optimal scan trigger threshold.
【作者单位】：河南省人民医院河南大学人民医院放射科;
【分类号】：R816.7

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