冠状动脉CT成像中冠状动脉追踪冻结技术的价值

发布时间：2018-09-17 16:04

【摘要】：目的:探讨不同心率条件下应用冠状动脉追踪冻结技术(SSF)对冠脉CT血管成像运动伪影的改善效果。方法:连续收集了113例疑诊冠心病患者,使用Discovery CT 750 HD Freedom行冠脉CTA检查,图像均采用标准算法(STD)及SSF算法两种方法进行重建,由两位主治以上医师以Likert 4分作为评分标准,采用随机双盲法对冠状动脉分支及节段水平的图像质量进行独立判读。以扫描时心率为标准,分为1~6组,相同心率组不同重建方法的图像质量评分比较采用秩和检验,可判读性比较采用卡方检验。结果:所有心率组SSF算法重建图像质量在前降支、回旋支、右冠状动脉每支血管水平评分均明显高于STD(P均0.05);左主干两种算法图像评分差异无统计学意义(P均0.05),节段评分SSF算法显著高于STD算法(P均0.001)。3~6组SSF算法重建图像可判读性在节段水平均明显高于STD重建图像(P均0.01);1~2组两种算法可判读性差异无统计学意义;4~5组SSF算法重建图像可判读性在右冠状动脉每支血管水平明显高于STD重建图像(P均0.01)。结论:与标准算法比较,SSF能够明显改善各心率组图像质量,并明显提高了高心率组图像的可判读性。
[Abstract]:Aim: to investigate the effect of coronary artery tracking freezing technique (SSF) on motion artifact of coronary artery CT under different heart rate. Methods: a total of 113 patients with suspected coronary heart disease were examined with Discovery CT 750 HD Freedom for coronary CTA. The images were reconstructed by standard algorithm (STD) and SSF algorithm. Likert 4 scores were used as the scoring criteria by two physicians. The image quality of coronary artery branching and segmental level was independently interpreted by random double blind method. According to the standard of heart rate during scanning, the patients were divided into 6 groups. The image quality scores of different reconstruction methods in the same heart rate group were compared by rank sum test, and the discriminative comparison was made by chi-square test. Results: all heart rate group SSF algorithm reconstructed image quality in anterior descending branch and circumflex branch. There was no significant difference in image score between the two algorithms of left main coronary artery (P0. 05). The segmental score of SSF algorithm was significantly higher than that of STD algorithm (P 0.001). 3 groups of SSF algorithm could be judged. The legibility of the two algorithms in the two groups was significantly higher than that in the STD reconstruction image (P0.01). There was no significant difference between the two groups. There was no statistically significant difference between the two groups. The legibility of the reconstructed images of the SSF algorithm in the right coronary artery was significantly higher than that in the STD reconstruction images in each vessel of the right coronary artery (P0.01). Conclusion: compared with the standard algorithm, SSF can significantly improve the image quality of each heart rate group and improve the legibility of the high heart rate group image.
【作者单位】：新疆医科大学第一附属医院影像中心;
【基金】：新疆维吾尔自治区自然科学基金No.2015211C074~~
【分类号】：R816.2;R541.4

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