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首页> 外文会议>Physics of Medical Imaging pt.3; Progress in Biomedical Optics and Imaging; vol.8 no.29; Proceedings of SPIE-The International Society for Optical Engineering; vol.6510 pt.3 >Image Quality of the Front Exposure System and the Back Exposure System in the Indirect (X-ray-to-light Conversion) Digital Radiography System
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Image Quality of the Front Exposure System and the Back Exposure System in the Indirect (X-ray-to-light Conversion) Digital Radiography System

机译：间接（X射线到光转换）数字射线照相系统中前曝光系统和后曝光系统的图像质量

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摘要

In X-ray-to-light conversion digital radiography, we compared the image quality of a system in which photodetection is done from the X-ray incident surface (hereafter referred to as a front exposure system) and a system in which photodetection is done from the back side opposite the X-ray incident surface (hereafter referred to as a back exposure system). Modulation transfer function (MTF) and detective quantum efficiency (DQE) measurements were performed using the method IEC prescribes. Both MTF and DQE were higher with the front exposure system than with the back exposure system, with the former delivering better image quality. This difference can be accounted for by differences in the distribution of absorbed X-ray doses in the phosphor layer, the readout efficiency, which varies as a function of depth in the phosphor layer, and depth-dependent blurs of light. Furthermore, we determined changes in image quality incurred by varying the quality of X-rays, the thickness of the phosphor layer and the crystal structure of phosphors. The advantage of the front exposure system becomes more pronounced with decreasing X-ray tube voltage, increasing phosphor layer thickness, and the use of phosphors in powder form.
机译：在X射线到光的转换数字射线照相中，我们比较了从X射线入射表面进行光检测的系统（以下称为前曝光系统）和进行光检测的系统的图像质量。从与X射线入射面相对的背面（以下称为背面曝光系统）。使用IEC规定的方法进行调制传递函数（MTF）和探测量子效率（DQE）测量。前曝光系统的MTF和DQE均高于后曝光系统，前者可提供更好的图像质量。这种差异可以通过荧光粉层中吸收的X射线剂量分布的差异，读出效率（取决于荧光粉层中的深度而变化）以及与深度相关的光模糊来解决。此外，我们确定了由于改变X射线的质量，荧光粉层的厚度和荧光粉的晶体结构而引起的图像质量的变化。随着降低的X射线管电压，增加的荧光粉层厚度以及使用粉末形式的荧光粉，正面曝光系统的优势变得更加明显。

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