使用256层CT降低脑部灌注CT成像的辐射剂量：80毫安秒与160毫安秒的对比。
Radiation dose reduction in perfusion CT imaging of the brain using a 256-slice CT: 80 mAs versus 160 mAs.
作者信息
Riederer Isabelle, Zimmer Claus, Pfeiffer Daniela, Wunderlich Silke, Poppert Holger, Rummeny Ernst J, Huber Armin
机构信息
Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany; Department of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany.
Department of Diagnostic and Interventional Neuroradiology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany.
出版信息
Clin Imaging. 2018 Jul-Aug;50:188-193. doi: 10.1016/j.clinimag.2018.03.021. Epub 2018 Apr 5.
PURPOSE
To examine CTP of the brain in real patient data after reducing tube current down to 80 mAs to decrease radiation dose.
METHODS
CTP was acquired in 60 suspected stroke patients with 80 (n: 30) or 160 (n: 30) mAs. Data were analyzed retrospectively by two independent readers. SNR, perfusion maps and image quality were compared in hypoperfused and non-affected areas.
RESULTS
SNR was significantly higher in CTP with 160 mAs compared to 80 mAs (p < 0.001) in non-affected regions, but there was no significant difference in hypoperfused regions. Overall, images with 80 mAs were rated worse than the ones with 160 mAs (3.0 ± 0.7 versus 4.0 ± 0.7), however, still as sufficient to detect proximal vessel occlusions.
CONCLUSION
Tube current of 80 mAs is still sufficient for the detection of perfusion deficits of proximal vessel occlusions.
目的
在将管电流降低至80 mAs以减少辐射剂量后，研究真实患者数据中的脑CT灌注成像（CTP）。
方法
对60例疑似中风患者进行CTP检查，管电流分别为80 mAs（n = 30）和160 mAs（n = 30）。由两名独立的阅片者对数据进行回顾性分析。比较灌注不足区域和未受影响区域的信噪比（SNR）、灌注图和图像质量。
结果
在未受影响区域，160 mAs的CTP的SNR显著高于80 mAs的CTP（p < 0.001），但在灌注不足区域无显著差异。总体而言，80 mAs的图像评分低于160 mAs的图像（3.0 ± 0.7对4.0 ± 0.7），不过，仍足以检测近端血管闭塞。
结论
80 mAs的管电流仍足以检测近端血管闭塞的灌注缺损。
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