Medical X-ray Imaging-Current Status and the Future
Introduction Medical x-ray imaging has been evolving along two tracks: projection x-ray imaging and computed tomography (CT). The main difference between the two is that the former employs large area, high resolution detectors while the latter employs high quality array detectors specially designed for CT. This difference has in recent years become more blurry but the fundamental difference remains the same. 1 Projection Imaging The issues of x-ray scatter and heavy patient attenuation have been the two major challenges in our effort to improve the image quality while keeping the patient dose in check. The presence of the x-ray scatter component in the image signals biases the transmitted x-ray intensity and results in erroneous x-ray attenuation measurements which degrades the image quality and prevents accurate quantitative analysis in both projection and reconstructed images. Various scatter correction and rejection techniques have been proposed and investigated. However, only the anti-scatter method has been widely used with both screen-film and digital imaging techniques. The other major issue is the lack of x-ray photons in heavily attenuating regions, such as abdomen or retrocardium.
Chris C Shaw
Department of Imaging Physics, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030
国际会议
南京
英文
1-2
2009-10-23（万方平台首次上网日期，不代表论文的发表时间）