Agostini Denis, Marie Pierre-Yves, Ben-Haim Simona, Rouzet François, Songy Bernard, Giordano Alessandro, Gimelli Alessia, Hyafil Fabien, Sciagrà Roberto, Bucerius Jan, Verberne Hein J, Slart Riemer H J A, Lindner Oliver, Übleis Christopher, Hacker Marcus
Department of Nuclear Medicine, CHU Caen and Normandy University, EA 4650, Caen, France.
Normandy University, EA 4650, Caen, France.
Eur J Nucl Med Mol Imaging. 2016 Dec;43(13):2423-2432. doi: 10.1007/s00259-016-3467-5. Epub 2016 Aug 19.
The trade-off between resolution and count sensitivity dominates the performance of standard gamma cameras and dictates the need for relatively high doses of radioactivity of the used radiopharmaceuticals in order to limit image acquisition duration. The introduction of cadmium-zinc-telluride (CZT)-based cameras may overcome some of the limitations against conventional gamma cameras. CZT cameras used for the evaluation of myocardial perfusion have been shown to have a higher count sensitivity compared to conventional single photon emission computed tomography (SPECT) techniques. CZT image quality is further improved by the development of a dedicated three-dimensional iterative reconstruction algorithm, based on maximum likelihood expectation maximization (MLEM), which corrects for the loss in spatial resolution due to line response function of the collimator. All these innovations significantly reduce imaging time and result in a lower patient's radiation exposure compared with standard SPECT. To guide current and possible future users of the CZT technique for myocardial perfusion imaging, the Cardiovascular Committee of the European Association of Nuclear Medicine, starting from the experience of its members, has decided to examine the current literature regarding procedures and clinical data on CZT cameras. The committee hereby aims 1) to identify the main acquisitions protocols; 2) to evaluate the diagnostic and prognostic value of CZT derived myocardial perfusion, and finally 3) to determine the impact of CZT on radiation exposure.
分辨率与计数灵敏度之间的权衡主导着标准伽马相机的性能,并决定了需要使用相对高剂量的放射性药物,以便限制图像采集时间。基于碲化镉锌(CZT)的相机的引入可能会克服传统伽马相机的一些局限性。与传统单光子发射计算机断层扫描(SPECT)技术相比,用于评估心肌灌注的CZT相机已被证明具有更高 的计数灵敏度。基于最大似然期望最大化(MLEM)开发的专用三维迭代重建算法进一步提高了CZT图像质量,该算法可校正因准直器的线响应函数导致的空间分辨率损失。与标准SPECT相比,所有这些创新都显著缩短了成像时间,并降低了患者的辐射暴露。为指导当前和未来可能使用CZT技术进行心肌灌注成像的用户,欧洲核医学协会心血管委员会从其成员的经验出发,决定审查有关CZT相机程序和临床数据的现有文献。委员会的目标如下:1)确定主要采集方案;2)评估CZT衍生的心肌灌注的诊断和预后价值;最后3)确定CZT对辐射暴露的影响。