Sarikaya Ismet, Sarikaya Ali
Department of Nuclear Medicine, Kuwait University Faculty of Medicine, Safat, Kuwait; and
Department of Nuclear Medicine, Trakya University Faculty of Medicine, Edirne, Turkey
J Nucl Med Technol. 2021 Mar;49(1):19-22. doi: 10.2967/jnmt.120.248641. Epub 2020 Jul 24.
PET/CT images are usually obtained in the arms-up position in patients with no head and neck pathology and in the arms-down position to image the head and neck area. The arms usually cause artifacts regardless of up or down positioning. These artifacts include beam hardening, scatter, truncation, and cold areas (cold artifacts) in obese or large patients; motion artifacts; implanted-metal-object artifacts; and artifacts related to radiotracer extravasation at the injection site. In this review article, we will discuss the mechanisms of these artifacts and suggest solutions to reduce or eliminate them, such as reviewing the non-attenuation-corrected PET images, performing extended-field-of-view reconstruction, not applying scatter correction, and using software to correct beam-hardening, scatter, and truncation artifacts. We will present various PET/CT images before and after corrections for such artifacts.
对于没有头颈部病变的患者，PET/CT图像通常在双臂上举位采集，而在对头颈部区域成像时则在双臂下垂位采集。无论双臂是上举还是下垂，通常都会产生伪影。这些伪影包括肥胖或体型较大患者中的束硬化、散射、截断和冷区（冷伪影）；运动伪影；植入金属物体伪影；以及与注射部位放射性示踪剂外渗相关的伪影。在这篇综述文章中，我们将讨论这些伪影的机制，并提出减少或消除它们的解决方案，例如查看未进行衰减校正的PET图像、进行视野扩展重建、不应用散射校正以及使用软件校正束硬化、散射和截断伪影。我们将展示校正此类伪影前后的各种PET/CT图像。
