Floyd C E, Baker J A, Lo J Y, Ravin C E
Department of Radiology, Duke University Medical Center, Durham, NC 27710.
Invest Radiol. 1992 Feb;27(2):119-23. doi: 10.1097/00004424-199202000-00004.
The authors presented a new posterior beam-stop (PBS) technique for measuring the ratio of scattered to total-detected photon flux (scatter fraction) in a radiographic examination while preserving the diagnostic quality of the image. The scatter measurement was made using a standard imaging geometry with both beam stops and an additional x-ray detector placed behind the standard imaging detector. This PBS geometry differs from the standard beam-stop (SBS) technique for scatter measurement. With SBS, a beam-stop shadow appears on the image. To evaluate the PBS technique, scatter fraction measurements were performed on an anatomic phantom using both the PBS and SBS techniques. When compared with the standard technique, PBS provided accurate estimation of scatter fractions. Since the measurement can be performed without degrading a standard clinical radiographic examination, the PBS technique allows simultaneous acquisition of scatter measurements from human patients in combination with a standard radiographic examination.
作者提出了一种新的后向束流阻挡（PBS）技术，用于在X射线检查中测量散射光子通量与总检测光子通量的比值（散射分数），同时保持图像的诊断质量。散射测量是使用标准成像几何结构进行的，在标准成像探测器后方同时设置了束流阻挡器和一个额外的X射线探测器。这种PBS几何结构与用于散射测量的标准束流阻挡（SBS）技术不同。使用SBS时，图像上会出现束流阻挡阴影。为了评估PBS技术，使用PBS和SBS技术在解剖模型上进行了散射分数测量。与标准技术相比，PBS能够准确估计散射分数。由于该测量可以在不降低标准临床X射线检查质量的情况下进行，PBS技术允许在进行标准X射线检查的同时，从人类患者身上同步获取散射测量数据。
