Technical note: how to determine the FDG activity for tumour PET imaging that satisfies European guidelines.

Technical note: how to determine the FDG activity for tumour PET imaging that satisfies European guidelines.
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DOI:
10.1186/s40658-016-0158-z
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发表时间:
2016-12
期刊:
影响因子:
4
通讯作者:
van Dalen JA
van Dalen JA
中科院分区:
医学2区
文献类型:
--
作者:
Koopman D;van Osch JA;Jager PL;Tenbergen CJ;Knollema S;Slump CH;van Dalen JA

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对于 PET 肿瘤成像,文献建议采用患者特异性 FDG 活性,该活性与患者体重呈二次方关系。然而,目前缺乏如何在临床实践中实施此类方案的实用方法。我们的目的是提供一种实用的方法来确定全身 PET 检查的 FDG 活性公式,该公式既满足 EANM 指南又满足这种二次关系。我们开发了一种方法,可得出描述要施用的患者特异性 FDG 活性的公式。使用 NEMA NU-2001 图像质量模型进行的 PET 研究构成了我们方法的基础。该模型需要在背景和球体中分别填充 2.0 和 20.0 kBq FDG/mL。 PET 采集 10 分钟后,必须执行重建,使球体恢复系数 (RC) 符合 EANM 研究有限公司 (EARL) 定义的规格。通过基于较短的扫描持续时间执行重建,需要使用 15% 的图像变异系数 (COV) 来提取每个床位的最小扫描时间 (Tmin)。在 Tmin 时,RC 也应符合 EARL 规范。最后,要施用的 FDG 活性(以 MBq 为单位)可以用 c 来描述,该常数通常为 0.0533 (MBq/kg2),w 患者的体重(以 kg 为单位),以及 t 在临床环境中选择的每个床位的扫描时间(以秒为单位)。我们使用最先进的 PET/CT 扫描仪成功演示了这种方法。我们提供了一种实用的方法,可得出描述 FDG 活性的公式,以便对个体患者进行全身 PET 检查,同时考虑到 EANM 指南以及 FDG 活性与患者体重之间的二次关系。该公式通常适用于任何 PET 系统,使用指定的图像重建和每个床位的扫描时间。
For tumour imaging with PET, the literature proposes to administer a patient-specific FDG activity that depends quadratically on a patient’s body weight. However, a practical approach on how to implement such a protocol in clinical practice is currently lacking. We aimed to provide a practical method to determine a FDG activity formula for whole-body PET examinations that satisfies both the EANM guidelines and this quadratic relation. We have developed a methodology that results in a formula describing the patient-specific FDG activity to administer. A PET study using the NEMA NU-2001 image quality phantom forms the basis of our method. This phantom needs to be filled with 2.0 and 20.0 kBq FDG/mL in the background and spheres, respectively. After a PET acquisition of 10 min, a reconstruction has to be performed that results in sphere recovery coefficients (RCs) that are within the specifications as defined by the EANM Research Ltd (EARL). By performing reconstructions based on shorter scan durations, the minimal scan time per bed position (Tmin) needs to be extracted using an image coefficient of variation (COV) of 15 %. At Tmin, the RCs should be within EARL specifications as well. Finally, the FDG activity (in MBq) to administer can be described by with c a constant that is typically 0.0533 (MBq/kg2), w the patient’s body weight (in kg), and t the scan time per bed position that is chosen in a clinical setting (in seconds). We successfully demonstrated this methodology using a state-of-the-art PET/CT scanner. We provide a practical method that results in a formula describing the FDG activity to administer to individual patients for whole-body PET examinations, taking into account both the EANM guidelines and a quadratic relation between FDG activity and patient’s body weight. This formula is generally applicable to any PET system, using a specified image reconstruction and scan time per bed position.
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