Davies Andrew G, Cowen Arnold R, Kengyelics Stephen M, Moore Janet, Sivananthan Mohan U
Academic Unit of Medical Physics, University of Leeds, UK.
Eur Radiol. 2007 Jul;17(7):1787-94. doi: 10.1007/s00330-006-0458-0. Epub 2006 Nov 18.
The recent introduction of "flat-panel detector" (FD)-based cardiac catheterisation laboratories should offer improvements in image quality and/or dose efficiency over X-ray systems of conventional design. We compared three X-ray systems, one image-intensifier (II)-based system (system A), and two FD-based designs (systems B and C), assessing their image quality and dose efficiency. Phantom measurements were performed to assess dose rates in fluoroscopy and cine acquisition. Phantom dose rates were broadly similar for all systems, with all systems classified as offering "low" dose rates in fluoroscopy on standard phantoms. Patient X-ray dose rate and subjective image quality was assessed for 90 patients. Dose area product (DAP) rates were similar for all systems, except system C, which had a lower DAP rate in fluoroscopy. In terms of subjective image quality, the order of preference was (best to worst): system C, system A, system B. This study indicates that the use of an FD detector does not infer an automatic improvement in image quality or dose efficiency over II based designs. Specification and configuration of all of the components in the X-ray system contribute to the dose levels used and image quality achieved.
最近引入的基于“平板探测器”（FD）的心脏导管实验室相较于传统设计的X射线系统，应能在图像质量和/或剂量效率方面有所提升。我们比较了三种X射线系统，一种基于影像增强器（II）的系统（系统A）以及两种基于FD的设计（系统B和C），评估它们的图像质量和剂量效率。进行了模体测量以评估荧光透视和电影采集时的剂量率。所有系统的模体剂量率大致相似，在标准模体上所有系统在荧光透视时都被归类为提供“低”剂量率。对90名患者评估了患者X射线剂量率和主观图像质量。除系统C在荧光透视时剂量面积乘积（DAP）率较低外，所有系统的DAP率相似。在主观图像质量方面，偏好顺序为（从最佳到最差）：系统C、系统A、系统B。本研究表明，与基于II的设计相比，使用FD探测器并不会自动带来图像质量或剂量效率的提升。X射线系统中所有组件的规格和配置都会影响所使用的剂量水平和所实现的图像质量。
