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心肌灌注显像(myocardial perfusion imaging,MPI)是一种无创性检查技术,广泛应用于冠状动脉粥样硬化性心脏病(简称冠心病)的诊断及预后预测等[1]。但用于MPI的传统SPECT面临着诸多挑战,如探测器的灵敏度低、分辨率有限,无法进行动态显像,难以显示和识别小病灶,显像剂剂量较大,成像时间长,患者易发生位移等。应用碲锌镉(cadmium-zinc-telluride,CZT)晶体作为探测器的心脏专用SPECT(简称CZT-SPECT)采用新的半导体探测器、准直器和重建算法,达到了降低显像剂剂量、缩短采集时间、改善图像质量和扩展临床应用范围等目的。笔者对CZT-SPECT的临床应用进展进行综述。
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