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Effects of scattered x rays upon radiographs used for computer-and diagnosis

散射 X 射线对用于计算机和诊断的放射线照片的影响

基本信息

批准号：
08650072
负责人：
TAKIGAWA Atsushi
金额：
$ 1.34万
依托单位：
Hiroshima Prefectural Coolege of Health and Welfare
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650072/
关键词：
computer-aided diagnosis scattered x rays anti-scatter grid x-ray spectrum

项目摘要

Radiographs which are used for computer-aided diagnosis (CAD) should have enouth diagnositc information. Effects of scattered x rays upon radiographs were investigated for construting a CAD system.1.X-ray specturm measurementIt is important to know the properties of x rays emitted from an x-ray tube, for evaluating quality of radiographs and colent's exposure. Measuring method using a pure germanium detector, lead disks and an empirical collimator was established. Additionally, spectra of clinical x-ray apparatus were measured using a codmiumzinc telluride detector, which is paid attention as a new x-ray detector, and its usefulness was proved.2.Scatter fraction measurementA table equipped a moving grid system for experiment was developed. Using the table, we can exchange anti-scatter grid (grid hereafter) without moving experimental set-up. scatter fraction measuring method using a fluorescence-meter and lead^disks was established with the table.3.Evaluation of anti-scatter gridsPerformance of grids were investigated using Monte Carlo simulation. A new grid for bedside radiography was evaluated experimentally. As a result, it was clarified that the new gird was very useful when it was used under proper exposure conditions.4.Preparation for the construction of CAD system for swallowingFor the analysis of swallowing, an x-ray TV system, an imaging system, an image processing and archiving system and a chair for video fluorography were selecte. Pneumonia coused by miss swallowing was prevented under the observation with video fluoroscopy and video endoscopy.

用于计算机辅助诊断（CAD）的X线片应具有足够的诊断信息。本文研究了X射线散射对X射线照片的影响，为计算机辅助设计系统的研制提供了理论依据。1. X射线能谱测量了解X射线管发射的X射线的性质，对于评价X射线照片的质量和曝光量是很重要的。建立了用纯锗探测器、铅盘和经验准直器进行测量的方法。此外，还用一种新型的X射线探测器碲化锌钴探测器对临床X射线机的光谱进行了测量，并证明了它的实用性。2.散射分数测量研制了一个装有移动栅系统的实验台。使用该工作台，我们可以在不移动实验装置的情况下更换防散射滤线栅（以下简称滤线栅）。建立了用荧光计和铅盘测量散射分数的方法，并用表格表示。3.抗散射栅的评价用Monte Carlo模拟方法对栅的性能进行了研究。对一种新型床旁X线摄影滤线栅进行了实验评价。结果表明，当在适当的曝光条件下使用时，这种新的网格是非常有用的。4.吞咽CAD系统构建的准备对于吞咽的分析，选择了X射线电视系统、成像系统、图像处理和存档系统以及用于视频荧光造影的椅子。在电视透视和电视内窥镜观察下预防误吞咽引起的肺炎。