A scanning equalization system for improved chest radiography.
A scanning equalization system for improved chest radiography.
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用于改进胸部放射线摄影的扫描均衡系统。
DOI：
10.1148/radiology.142.3.7063700
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发表时间：
1982
期刊：
影响因子：
19.7
通讯作者：
Wandtke,JC
中科院分区：
文献类型：
--
作者：
Plewes,DB;Wandtke,JC
胸部后前位投影的吸收体厚度特征性变化很大，通常会导致胶片曝光不足，并伴随着纵隔、心后和血管区域的对比度不佳。我们提出了一种特殊的扫描系统，通过调制横向扫过患者胸部的垂直窄扇形（43 x 2 cm）辐射的强度，在图像上提供更均匀的胶片曝光。用放置在胶片暗盒后面的探测器获得的患者衰减测量值用于调整X射线管输出，以便在扫描过程中保持恒定的胶片曝光。扫描在5秒内完成，与传统胸片相比，纵隔穿透和对比度显着改善。
The wide variation in absorber thickness characteristic of the posteroanterior projection of the chest routinely results in film underexposure and attendant suboptimal contrast in the mediastinal, retrocardiac, and diaphragmatic regions. We propose a special scanning system to deliver a more uniform film exposure over the image by modulating the intensity of a vertically oriented narrow fan (43 x 2 cm) of radiation, swept laterally across the patient's chest. Measurements of patient attenuation obtained with a detector placed behind the film cassette are used to adjust the x-ray tube output so as to maintain a constant film exposure during the course of the scan. The scan is completed in 5 seconds and results in images of significantly improved mediastinal penetration and contrast compared with those of conventional chest radiographs.