Abstract: The chest PA examination is one of the single most performed studies in radiology today. It can provide a wealth of information in a single examination. As in many other areas of radiology there is a conflict between high contrast, which enables subtle structures to be visualized, and wide latitude, which allows all areas of interest in the chest to be displayed in a single image. In order to optimize the design of receptor systems it is useful to establish and understand the latitude required for thoracic imaging. We have measured the distributions of x-ray transmittance within the lungs, heart, and abdomen for a population of 868 out-patients. The measurements were made with a resolution element approximately 2 $MUL 2 cm, at a single x-ray beam quality, and with a low-scatter slot-beam geometry. Under these conditions, the required receptor latitude for capturing each area of interest in the thorax is derived as a function of body habitus. To capture all three regions the required receptor latitude for the PA examination varies from 11:1 to 81:1 with increasing patient size. The implications of these results for thoracic image-receptor design is discussed. !6
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机译：【摘要】胸部PA检查是当今放射学中执行次数最多的一项研究。它可以在一次检查中提供大量信息。就像在放射线学的其他许多领域一样，高对比度和宽纬度之间存在冲突，高对比度可以使细微的结构可视化，而宽纬度则可以在单个图像中显示胸部的所有感兴趣区域。为了优化受体系统的设计，建立和了解胸腔成像所需的纬度非常有用。我们测量了868名门诊病人在肺，心脏和腹部的X射线透射率分布。使用大约2 $ MUL 2 cm的分辨率元素，单一的X射线光束质量以及低散射的缝束几何进行测量。在这些条件下，获取捕获胸腔中每个感兴趣区域所需的受体纬度随身体习性而变化。要捕获所有三个区域，PA检查所需的受体范围随患者人数的增加从11：1到81：1不等。讨论了这些结果对胸腔图像受体设计的影响。 ！6
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