摘要IQ·SPECT与碲锌镉(CZT)探测器SPECT是心肌灌注显像新技术,与传统SPECT相比,具有灵敏度和空间分辨率高、采集时间短、注射显像剂剂量少及辐射剂量低等优点.与传统SPECT不同(低能高分辨率平行孔准直器),IQ· SPECT使用SMART-ROOM准直器及心脏为焦点的采集模式,提高了灵敏度;CZT探测器SPECT的探测器为半导体,取代了传统NaI晶体探测器,提高了能量分辨率、空间分辨率、灵敏度及信噪比等,并可定量分析心肌血流储备.笔者主要对三者的成像原理、性能参数及临床应用进行综述.

abstractsCadmium-Zinc-Telluride (CZT) SPECT and IQ· SPECT are new technologies used in myocardial perfusion imaging and are important in the development of nuclear cardiology.These technologies exhibit higher sensitivity and spatial resolution,shorter acquisition time,and lower injection and radiation doses than conventional SPECT.In contrast to the conventional SPECT system equipped with standard low-energy high-resolution collimators,IQ ·SPECT adopts SMART-ROOM collimators and cardiac-centric acquisition to improve detection sensitivity.The detectors of CZT SPECT consist of semiconductor materials,instead of conventional sodium iodide (NaI) crystals,to improve energy resolution,spatial resolution,sensitivity,and signal-to-noise ratio.These detectors can also quantitatively analyze myocardial flow reserve.This paper reviews the imaging principle,performance parameters,and clinical application of three SPECT systems.