使用直接转换型平板探测器降低脑血管造影的辐射剂量：一项血管模型研究。
Reduction of radiation dose for cerebral angiography using flat panel detector of direct conversion type: a vascular phantom study.
作者信息
Hatakeyama Y, Kakeda S, Ohnari N, Moriya J, Oda N, Nishino K, Miyamoto W, Korogi Y
机构信息
Department of Radiology, University of Occupational and Environmental Health School of Medicine, Kitakyushu, Japan.
出版信息
AJNR Am J Neuroradiol. 2007 Apr;28(4):645-50.
BACKGROUND AND PURPOSE
Compared with image intensifier television (I.I.-TV) system, an angiography system using the flat panel detector (FPD) of direct conversion type has a high spatial resolution, which may improve image quality, reduce patient exposure, or both. Our purpose was to evaluate the detection of simulated aneurysmal blebs under dose reduction with the FPD system in comparison with the I.I.-TV system.
MATERIALS AND METHODS
A vascular phantom was designed to simulate various intracranial aneurysms with and without blebs, and this phantom was filled with 3 different concentrations of contrast material (300, 150, and 100 mg I/mL). 2D digital subtraction angiography (DSA) at low-dose mode of FPD system was compared with 2D DSA at a standard-dose mode of FPD system and a conventional mode of I.I.-TV system. Data analysis was based on 171 observations (57 aneurysms [20 with bleb and 37 without bleb] x 3 contrast material concentrations) by each of 7 radiologists, and the detection performances of blebs were compared using a receiver operating characteristic (ROC) analysis.
RESULTS
The mean dose measurements with a phantom during 2D DSA were 0.36 mGy/frame with low-dose mode of FPD system, 0.72 mGy/frame with standard-dose mode of FPD system and 0.76 mGy/frame with I.I.-TV system. The mean Az at 100 mg I/mL was significantly higher for low-dose mode of FPD than for conventional-dose mode of I.I.-TV mean Az, 0.85 versus 0.56; P < .01), though differences were not significant with 150 and 300 mg I/mL between both systems.
CONCLUSION
The FPD system allows a considerable dose reduction during 2D DSA without loss of the image quality.
背景与目的
与影像增强电视（I.I.-TV）系统相比，使用直接转换型平板探测器（FPD）的血管造影系统具有较高的空间分辨率，这可能会提高图像质量、减少患者辐射剂量或两者兼具。我们的目的是评估在剂量降低的情况下，FPD系统与I.I.-TV系统相比对模拟动脉瘤小泡的检测能力。
材料与方法
设计一种血管模型来模拟有无小泡的各种颅内动脉瘤，并向该模型中注入3种不同浓度的造影剂（300、150和100 mg I/mL）。将FPD系统低剂量模式下的二维数字减影血管造影（DSA）与FPD系统标准剂量模式下的二维DSA以及I.I.-TV系统的传统模式进行比较。数据分析基于7位放射科医生对171次观察结果（57个动脉瘤[20个有小泡和37个无小泡]×3种造影剂浓度）进行，使用受试者操作特征（ROC）分析比较小泡的检测性能。
结果
二维DSA期间模型的平均剂量测量值为：FPD系统低剂量模式下为0.36 mGy/帧，FPD系统标准剂量模式下为0.72 mGy/帧，I.I.-TV系统为0.76 mGy/帧。在100 mg I/mL时，FPD低剂量模式的平均Az显著高于I.I.-TV传统剂量模式的平均Az（分别为0.85和0.56；P <.01），尽管在150和300 mg I/mL时两个系统之间的差异不显著。
结论
FPD系统在二维DSA期间可大幅降低剂量，且不损失图像质量。
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