Department of Neuroradiology, Clinic of Radiology & Nuclear Medicine, University Hospital Basel, Petersgraben 4, 4031, Basel, Switzerland.
Department of Radiology, University Medical Center Goettingen, Goettingen, Germany.
Eur Radiol. 2020 Sep;30(9):5082-5088. doi: 10.1007/s00330-020-06891-w. Epub 2020 Apr 28.
The aim was to measure the effective dose of flat-detector CT (FDCT) whole-brain imaging, biphasic FDCT angiography (FDCT-A), and FDCT perfusion (FDCT-P) protocols and compare it to previously reported effective dose values of multidetector CT (MDCT) applications.
We measured effective dose according to the IRCP 103 using an anthropomorphic phantom equipped with thermoluminescent dosimeters (TLDs). Placement was according to anatomical positions of each organ. In total, 60 TLDs (≥ 4 TLDs/organ) were placed into and onto the phantom to account for all relevant organs. Organs within the primary beam were covered with more TLDs. Additionally, we measured dose to the eye lens with two TLDs per eye. Protocols which we routinely use in clinical practice were measured on a biplane angiography system.
The effective dose of the 20-s protocol/7-s protocol for whole-brain imaging was 2.6 mSv/2.4 mSv. The radiation dose to the eye lens was 24/23 mGy. For the biphasic high-/low-dose FDCT-A protocol, the effective dose was 8.9/2.8 mSv respectively. The eye lens dose was 60/14 mGy. The contribution of bolus tracking to the effective dose was 0.66 mSv (assuming average duration of 14 s). The multisweep FDCT-P protocol had an effective dose of 5.9 mSv and an eye lens dose of 46 mGy.
Except for the high-dose biphasic FDCT-A protocol, FDCT applications used in neuroradiology have effective doses, which do not deviate more than 1 mSv from previously reported values for MDCT applications. However, the effective dose to the eye lens in commonly used stroke paradigms exceeds the recommended annual dose twofold.
• Flat-detector computed tomography (FDCT) can be used for acute and periinterventional imaging of acute stroke patients and in neurointerventions. • Except for the high-dose FDCT angiography protocol, the effective doses do not deviate more than 1 mSv from previously reported values for multidetector CT applications. • Strategies to decrease the effective lens dose especially in younger patients should be evaluated in the future.
旨在测量平板探测器 CT（FDCT）全脑成像、双相 FDCT 血管造影（FDCT-A）和 FDCT 灌注（FDCT-P）方案的有效剂量，并将其与先前报道的多排 CT（MDCT）应用的有效剂量值进行比较。
我们根据 IRCP 103 使用配备热释光剂量计（TLDs）的人体模型来测量有效剂量。放置位置根据每个器官的解剖位置。总共将 60 个 TLD（≥4 个/TLD 器官）放置到和置于模型中，以涵盖所有相关器官。主射束内的器官用更多的 TLD 覆盖。此外，我们用两个 TLD 测量每只眼睛的晶状体剂量。我们在临床实践中常规使用的方案在双平面血管造影系统上进行测量。
20 秒方案/7 秒方案全脑成像的有效剂量分别为 2.6 mSv/2.4 mSv。晶状体的剂量为 24/23 mGy。对于双相高/低剂量 FDCT-A 方案，有效剂量分别为 8.9/2.8 mSv。晶状体剂量为 60/14 mGy。团注追踪对有效剂量的贡献为 0.66 mSv（假设平均持续时间为 14 s）。多扫 FDCT-P 方案的有效剂量为 5.9 mSv，晶状体剂量为 46 mGy。
除高剂量双相 FDCT-A 方案外，神经放射学中使用的 FDCT 应用的有效剂量与先前报道的 MDCT 应用的有效剂量相差不超过 1 mSv。然而，在常用的中风范例中，晶状体的有效剂量超过了推荐的年剂量两倍。
平板探测器 CT（FDCT）可用于急性和介入前急性卒中患者的成像以及神经介入。
除高剂量 FDCT 血管造影方案外，有效剂量与先前报道的多排 CT 应用的有效剂量相差不超过 1 mSv。
应在未来评估降低特别是年轻患者晶状体有效剂量的策略。
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