新型IMR全模型迭代重建技术在冠脉搭桥术后患者中的应用

摘要

Objective To investigate the value of knowledge-based iterative model reconstruction (IMR) on image quality in patients with coronary angiography bypass grafts (CABG). Methods We studied 30 patients (20 males and 10 males) with CABG using MDCT. Paired image sets were created using two types of reconstruction:hybrid iterative reconstruction(HIR) and IMR. Quantitative parameters including CT attenuation,noise,SNR and CNR of aorta,left ventricle,grafts were compared. The subjective image quality-image(noise,steak artifacts,margin sharpness of each cardiovascular structure) was compared. Results The image noise of IMR was lower than that of HIR,and SNR and CNR of IMR were better than that of HIR in all evaluate struc-tures. The visual image score was higher for IMR than for HIR. Conclusion IMR can significantly decrease the image noise and improve image quality for the patients with CABG.%目的 评价IMR新型全模型迭代重建技术在冠脉搭桥术后患者中的应用价值.方法 我们研究了30例冠脉搭桥术后CTA随访的患者,采用前瞻性的扫描模式,使用高级混合迭代重建技术(hybrid iterative reconstruction, HIR)和全模型迭代重建技术 (knowledge-based iterative model reconstruction,IMR) 进行配对重建.主动脉、左心室、动静脉桥血管的CT值、影像噪声、信噪比(SNR)、对比噪声比(CNR)进行比较.主观影像质量(影像噪声、条形伪影、心血管结构的边缘锐利度)进行配对比较.结果 在评价的各个结构中,使用IMR方法进行重建,影像噪声低于HIR的重建方法, SNR和CNR都高于HIR的重建方法.视觉影像质量得分都高于HIR的重建方法.结论 IMR全模型迭代重建方法能够明显降低搭桥术后患者的图像噪声,提高影像质量.