双层探测器光谱CT在心脏成像中的应用进展

Application advantages of dual-layer spectral detector CT in cardiac imaging

双层探测器光谱CT(SDCT)具有上下两层空间对等的探测器结构,使高、低能2套数据在原始数据域空间即被解析,可用于重建反映康普顿效应和光电效应不同组成的能谱图像,并可合并重建完全等同于普通CT所具有的常规多能图像。SDCT的能谱数据具有同时、同源、同向特征,提升了其在心脏成像中的应用价值。本文对SDCT在改善冠状动脉CTA图像质量、“双低”成像、显示斑块及支架以及心肌灌注方面的应用价值进行综述。

The equivalent detector structure in the upper and lower layers of dual-layer spectral detector CT(SDCT)allows the two sets of high and low energy data be analyzed in the raw data domain space.It can be used to reconstruct spectral images reflecting different composition of compton scattering and photoelectric effect,so as to merge and reconstruct conventional polyenergetic images which are completely equivalent to that of ordinary CT.The spectral data of SDCT possesses the features of no mismatch,aligned source and same direction into projection,which increase the application values in cardiac imaging.The application advantages of SDCT in improving coronary CTA image quality,"double low"imaging,plaque and stent display and myocardial perfusion were reviewed in this article.