全模型迭代重建在头颈部CT血管成像中的应用

全模型迭代重建（IMR）在重建过程中建立图像统计模型和数据统计模型，通过反复进行扫描模型与采集数据之间的差异对比校正，实现影像最优化。头颈部CT血管成像采用IMR技术能显著降低影像噪声、提高影像信噪比和对比噪声比，可增强对脑动脉硬化和动脉瘤的诊断信心；还能提高对早期缺血性卒中动脉致密征检出的敏感度、大幅降低CT灌注的辐射剂量、减少CT血管成像对比剂用量以及降低病人的碘负荷。综述IMR技术在头颈部CT血管成像中的应用进展。

Application of knowledge-based iterative model reconstruction in head-neck CT angiography

Iterative model reconstruction (IMR) establishes image statistics and data statistics models during its iterative cycle and achieves image optimization by repeatedly correcting the differences between scan model and acquired data. IMR can significantly reduce image noise, improve image signal-to-noise ratio and contrast-to-noise ratio for head and neck CTA, and increase the diagnostic confidence of atherosclerosis and aneurysm. IMR can also increase sensitivity in detecting hyperdense artery sign in the early ischemic stroke, significantly reduce the radiation dose in CT perfusion and the iodine load of patients. In this paper, the progress of application of iterative model reconstruction technology in head and neck CT angiography was reviewed.