Analysis of exposure technique of computed radiography

计算机X线摄影曝光技术分析

基本信息

批准号：
61570508
负责人：
NAKANO Yoshihisa
金额：
$ 1.41万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61570508/
关键词：
Computed Radiography 画像処理デジタルX線ラチチュード X線撮影法

项目摘要

For proper x-ray data acquisition and image display in Computed Radiography(CR), it is necessary to know the dynamic ranges of the detector and display, and also of the subject being radiographed. We have developed a computer program which enables to measure the dynamic range of the subject. In the conventional radiographic techniques, we kept the dynamic range of the subject within the dynamic range of the film by changing the exposure factors. Exposure techniques should be reconsidered to take full advantage of CR, because the images with wide dynamic range show effectiveness of the picture processing, particularly spatial filtering.We have developed an automatic measurement system of acetabular angle which is a diagnostic parameter of congenital hip dislocation (LCC) using a computed radiography. Because of improved low-contrast detectability of the CR, the angle can be measured under one-twentieth X-ray dose comparing with conventional system.A network using fiber-optic ring architecture has been implemented to connect X-ray CT, with an image work-station and optical disk storage unit. The work-station has three, non-interlaced CRT monitors of 1024x1024 pixels. The optical disk system stores 32 optical disk cartridges (2.6Gbyte/cartridges). On-line date acquisition, long-term archiving, and CT and CR interpretation using CRT have been tested and the system has been working for 6 months in clinical environment.

为了在计算的X射线照相（CR）中进行适当的X射线数据采集和图像显示，有必要了解检测器和显示的动态范围，也需要了解射线照相仪的主题。我们已经开发了一个计算机程序，该程序能够衡量主题的动态范围。在传统的放射学技术中，我们通过改变暴露因子将受试者的动态范围保持在膜的动态范围内。应重新考虑曝光技术以充分利用CR，因为具有广泛动态范围的图像显示了图片处理的有效性，尤其是空间滤波。我们已经开发了一种自动测量髋臼角的测量系统，这是先天性髋关节脱位的诊断参数（ LCC）使用计算的X射线照相。由于CR的低对比度可检测性的提高，可以在一二十次X射线剂量下与传统系统进行比较。工作站和光盘存储单元。该工作局具有1024x1024像素的三个非裂开的CRT监视器。光磁盘系统存储32个光盘墨盒（2.6Gbyte/cartridges）。已经测试了在线的日期获取，长期归档以及CT和CR解释，并且该系统在临床环境中已经工作了6个月。