追踪冻结技术及不同期相重建在冠状动脉成像中的作用研究

Study on the role of snapshot freeze technique and different phase reconstruction in coronary artery imaging

目的探讨追踪冻结技术(SSF)及不同期相重建在冠状动脉成像中的应用价值。方法选取2018年1月至2019年4月该院行冠状动脉CT血管成像的210例患者为研究对象,采用前瞻性心电门控扫描模式进行标准算法(STD)、45%和75%期相的SSF算法重建,对不同算法重建图像进行质量评分。结果SSF算法不同期相重建的冠状动脉总分支、左前降支(LAD)、左回旋支(LCX)和右冠状动脉(RCA)评分均高于STD算法(P<0.05);LAD在SSF算法的75%期相重建图像评分为(3.87±0.30)分,高于45%期相重建图像评分(P<0.05);RCA在SSF算法的45%期相重建图像评分为(3.84±0.21)分,高于75%期相重建图像评分(P<0.05);SSF算法不同期相重建的RCA的2、3段和LAD的6、7段评分均高于STD算法(P<0.05);RCA的2、3段在SSF算法的45%期相重建图像评分为(3.76±0.23)分,高于75%期相重建图像评分(P<0.05);LAD的6、7段在SSF算法的75%期相重建图像评分为(3.81±0.29)分,高于45%期相重建图像评分(P<0.05)。结论SSF及不同期相重建能明显提高冠状动脉成像的图像质量。

Objective To explore the application value of snapshot freeze technique(SSF)and different phase reconstruction in coronary artery imaging.Methods From January 2018 to April 2019,210 patients underwent coronary artery CT angiography in hospital,the standard algorithm(STD),45%and 75%phase SSF algorithm were reconstructed by prospective electrocardiogram gated scanning mode,and the quality of reconstructed images in different algorithms was evaluated.Results The total branch,left anterior descending(LAD),left circumflex(LCX)and right coronary artery(RCA)scores of SSF algorithm in different phases were higher than those of STD algorithm(P<0.05);The score of LAD in 75%phase reconstruction image of SSF algorithm was(3.87±0.30)point,which was higher than that in 45%phase reconstruction image(P<0.05);The score of RCA in 45%phase reconstruction image of SSF algorithm was(3.84±0.21)point,which was higher than that in 75%phase reconstruction image(P<0.05);The scores of 2 and 3 segments of RCA and 6 and 7 segments of LAD reconstructed by SSF algorithm were higher than those of STD algorithm(P<0.05);The score of 2 and 3 segments of RCA in 45%phase reconstruction image of SSF algorithm was(3.76±0.23)point,which was higher than that of 75%phase reconstruction image(P<0.05);The score of 6 and 7 segments of LAD in 75%phase reconstruction image of SSF algorithm was(3.81±0.29)point,which was higher than that of 45%phase reconstruction image(P<0.05).Conclusion SSF and different phase reconstruction can significantly improve the image quality of coronary artery imaging.