肾动脉CTA最佳成像时间点分析:CT灌注成像与CTA对比

发布时间：2018-04-25 02:14

本文选题：肾脏 + 体层摄影术　；参考：《中国介入影像与治疗学》2017年02期

【摘要】：目的采用全肾CT灌注成像(CTP)数据提取最佳CTA期相,并与自动触发扫描获得的CTA图像进行对比。方法回顾性分析因怀疑肾脏或上中腹部疾病行肾脏CT增强及灌注扫描的连续患者(n=21)以及同时期进行全腹CTA成像的患者(n=19)。灌注扫描患者先进行肾脏平扫,然后进行灌注扫描;CTA成像患者使用自动触发技术扫描。灌注图像采用CT Perfusion 4D肾脏灌注软件进行分析,根据左肾动脉和左肾静脉的时间-密度曲线(TDC)选择两个肾动脉CTA的期相,分别为A组和B组。CTA扫描数据使用Viewer功能进行测量,为C组。记录左肾动脉、左肾静脉CT值以及皮下脂肪的CT值和SD值。计算左肾动脉与左肾静脉的CT值差值、CNR及SNR,并进行对比。将CTA数据进行肾动脉血管重建,进行主观评分并进行分析。结果 3组的左肾动脉CT值、左肾静脉CT值、动静脉CT值差值、皮下脂肪CT值、皮下脂肪SD值、CNR、SNR间差异均有统计学意义(P均0.001)。除A组与C组肾动脉CT值、A组与B组和B组与C组动静脉CT值差值、A组与B组皮下脂肪CT值和SD值、CNR、SNR差异无统计学意义外(P均0.05),余两两比较差异均有统计学意义(P均0.05)。结论利用肾脏CTP数据,可获得肾动脉CTA数据;肾动脉与肾静脉CT值差值最大且满足肾动脉CT值超过300HU的期相为最佳肾动脉CTA成像期相。
[Abstract]:Objective to extract the optimal CTA phase by CT perfusion imaging (CTP) data of whole kidney and compare it with the CTA image obtained by automatic trigger scan. Methods A retrospective analysis was made on the patients with suspected renal or upper midabdominal diseases who underwent renal CT enhancement and perfusion scanning (n = 21) and those who underwent total abdominal CTA imaging at the same time. Perfusion scans were performed first with plain scan of kidney, then with perfusion scan and CTA with automatic trigger technique. The perfusion images were analyzed by CT Perfusion 4D renal perfusion software. According to the time-density curve of left renal artery and left renal vein, the phase phase of CTA of two renal arteries was selected. The scanning data of group A and group B were measured with Viewer function. Group C. Ct value of left renal artery, left renal vein, CT value of subcutaneous fat and SD value were recorded. The difference of CT value between left renal artery and left renal vein was calculated, CNR and SNR were calculated and compared. CTA data were used to reconstruct renal artery, subjective score and analysis were carried out. Results the CT value of left renal artery, the CT value of left renal vein, the difference of CT value of arteriovenous, subcutaneous fat and subcutaneous fat were significantly different among the three groups (P = 0.001). Except the CT value of renal artery in group A and C and the difference of CT value between group A and group B, group B and group C, there was no significant difference in subcutaneous fat CT value and SD value between group A and group B, except that there was no significant difference between group A and group C (P 0.05), and there was significant difference between group A and group B (P 0.05). Conclusion the renal artery CTA data can be obtained by using renal CTP data, and the phase in which the CT value of renal artery and renal vein is the largest and the CT value of renal artery exceeds 300HU is the best phase of renal artery CTA imaging.
【作者单位】：大连医科大学附属第一医院放射科;
【分类号】：R692;R816.7

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