EQUALIZATION TECHNIQUES IN CHEST RADIOGRAPHY

胸部X线摄影是最重要的诊断检查， 检测无症状的肺部疾病，包括癌症， 在监测其他主要心肺疾病方面发挥核心作用， 心脏病和肺炎。 常规胸部X线摄影 由于组织厚度变化较大， 肺区（15 cm）和纵隔、肺动脉和 心脏部分（30 cm），可能导致胶片变化50倍 exposure. 考虑到大约10倍的有效暴露范围， 射线照相胶片。 这种情况会导致胸部X光片软 当肺在较厚的身体部位上的组织对比度被损害时 区域以最大的胶片对比度呈现。 我们已经开发出一种自动化的技术， 通过扫描均衡对胸片的所有部分进行对比 射线照相术（SER），区域性地调整事件患者暴露， 消除了膜密度的大偏移。 该技术使用 然后，在4.7中完成常规射线照相胶片的成像扫描， 秒 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， 这种技术的结果改善了正常解剖结构的可视化， 更高的诊断效率。 我们建议进一步发展这项技术，重点是减少我们的 当前扫描时间，以尽量减少运动不清晰度，探索使用 同时进行能量和强度均衡以增强肺组织 课题对比和检验方法的可行性， 使用多个扫描光束的SER。

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.