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首页> 外文会议>Physics of Medical Imaging pt.3; Progress in Biomedical Optics and Imaging; vol.7 no.28 >Comparison of two detector systems for cone beam CT small animal imaging - a preliminary study
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Comparison of two detector systems for cone beam CT small animal imaging - a preliminary study

机译：两种用于锥形束CT小动物成像的探测器系统的比较-初步研究

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Purpose: To compare two detector systems - one based on the charge-coupled device (CCD) and image amplifier, the other based on a-Si/CsI flat panel, for cone beam computed-tomography (CT) imaging of small animals. A high resolution, high framing rate detector system for the cone beam CT imaging of small animals was developed. The system consists of a 2048x3072x12 bit CCD optically coupled to an image amplifier and an x-ray phosphor screen. The CCD has an intrinsic pixel size of 12 μm but the effective pixel size can be adjusted through the magnification adjustment of the optical coupling systems. The system is used in conjunction with an x-ray source and a rotating stage for holding and rotating the scanned object in the cone beam CT imaging experiments. The advantages of the system include but are not limited to the ability to adjust the effective pixel size and to achieve extremely high spatial resolution and temporal resolution. However, the need to use optical coupling compromises the detective quanta efficiency (DQE) of the system. In this paper, the imaging characteristics of the system were presented and compared with those of an a-Si/CsI flat-panel detector system.
机译：目的：比较两种探测器系统-一种基于电荷耦合器件（CCD）和图像放大器，另一种基于a-Si / CsI平板，用于对小动物进行锥形束计算机断层扫描（CT）成像。开发了用于小动物的锥形束CT成像的高分辨率，高成帧率检测器系统。该系统由光学耦合到图像放大器和X射线荧光屏的2048x3072x12位CCD组成。 CCD的固有像素尺寸为12μm，但有效像素尺寸可以通过光学耦合系统的放大倍数进行调整。该系统与X射线源和旋转台结合使用，用于在锥束CT成像实验中固定和旋转扫描的对象。该系统的优点包括但不限于调节有效像素尺寸以及实现极高的空间分辨率和时间分辨率的能力。但是，使用光学耦合的需求损害了系统的检测量子效率（DQE）。本文介绍了该系统的成像特性，并与a-Si / CsI平板探测器系统的成像特性进行了比较。

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