EQUALIZATION TECHNIQUES IN CHEST RADIOGRAPHY

胸部摄影是诊断本病最重要的检查方法。 检测包括癌症在内的无症状肺部疾病，并发挥作用 在监测其他主要心肺疾病方面发挥核心作用 比如心脏病和肺炎。传统的胸片是 由于组织厚度变化很大，技术上很困难 肺区(15厘米)与纵隔、横隔区和纵隔之间 心脏部分(30厘米)，可导致胶片变化50倍 曝光。考虑到大约10倍的有用暴露范围 射线胶片。这种情况会导致胸部X光片上的软组织 当肺部较厚时，较厚部位的组织对比就会受到影响 区域以最大胶片对比度进行渲染。 我们已经开发出一种自动保持胶片均匀的技术 扫描均衡法对胸片各部分的对比研究 放射照相(SER)，地区性地定制事件患者的暴露，以便 消除了胶片密度的大漂移。这项技术使用 并在4.7中完成成像扫描 几秒钟。我们已经证明了这项技术的技术可行性。 一项临床研究表明，暴露的一致性特征 这项技术的结果改善了正常解剖的可视化和 更好的诊断效果。 我们建议进一步开发这项技术，重点是减少我们的 当前扫描时间最大限度地减少运动不清晰度，探索使用 能量和强度同时均衡以增强肺组织 受试者对比和测试更有效的方法的可行性 使用多个扫描光束的序列。

Chest radiography is the most important diagnostic examination for the detection of asymptomatic lung disorders including cancer and plays a central role in the monitoring of other major cardiopulmonary diseases such as heart disease and pneumonia. Conventional chest radiography is technically difficult due to the large variations in tissue thickness between the lung zones (15 cm) and the mediastinal, diaphragmatic and cardiac portions (30 cm) which can result in 50 fold variations in film exposure. Considering the approximately 10 fold useful exposure range of radiographic film. This condition results in chest radiographs where soft tissue contrast over the thicker body parts is compromised when the lung zones are rendered with maximum film contrast. We have developed an automatic technique of maintaining uniform film contrast over all parts of a chest radiograph by Scanning Equalization Radiography (SER) that regionally tailors the incident patient exposure so the large excursion in film density are eliminated. The technique uses conventional radiographic film and completes an image forming scan in 4.7 seconds. We have demonstrated the technical feasibility of this technique and a clinical study has shown that the exposure consistency characteristic of this technique results improved visualization of normal anatomy and greater diagnostic efficacy. We propose further development of this technique focusing on reducing our current scan time to minimize motion unsharpness, exploring the use of simultaneous energy and intensity equalization to enhance lung tissue subject contrast and testing the feasibility of more efficient methods of SER using multiple scanning beams.