DEVELOPMENT OF SOFT X-RAY CT FOR DETECTION OF NON-METALLIC FOREIGN MATERIALS IN FOOD AND AGRICULTURAL PRODUCTS

食品和农产品中非金属异物检测软X射线CT的开发

基本信息

批准号：
09460116
负责人：
MORITA Kazuo
金额：
$ 7.74万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09460116/
关键词：
Soft X-ray CT Non-Metallic Foreign Materials Contamination Food & Agricultural Products Micro focus system Internal detection Image Analysis 食品及び農産物エネルギスペクトル

项目摘要

In order to develop soft X-ray CT system for detecting foreign non-metallic materials, basic data for soft X-ray properties were collected by various approaches and the results were shown as follows;1. In order to improve the detection accuracy which is one of major problem in recent detector for foreign material, the soft X-ray projection images were measured and analyzed by X-ray Image Intensifier and Image Analyzing System. The foreign materials were able to be detected by the analyzed image easier than the original image. However, it could not be detected all kinds of foreign materials by using X-ray projection method through materials.2. In order to clear the accuracy problem of X-ray CT for detection of foreign materials, the X-ray CT scanner for medical use was used. It was cleared that the CT scanner had detection limit for foreign materials by systemic error on point spread function basis and classification error on Beer's law basis.3. In order to examine the detectability of foreign materials, the soft X-ray transmission and reflection spectra were measured. By the soft X-ray transmission spectra through test materials, the detection accuracy for foreign materials was better. And by the soft X-ray reflection spectra from test materials, unique properties of materials for soft X-ray were obtained.4. A trial machine of Soft X-ray CT with micro focus system was assembled and 500 image shots were re-constructed for a CT image. The resolution of less than 100 micro-meter was realized by micro focus system and it was considered to be able to detect thin and small non-metallic materials in food.

为了研制检测异种非金属材料的软X射线CT系统，通过多种途径收集了软X射线性能的基础数据，结果如下： 1．为了提高目前异物检测仪的主要问题之一的检测精度，利用X射线图像增强器和图像分析系统对软X射线投影图像进行了测量和分析。通过分析图像比原始图像更容易检测到异物。但X射线透过材料投影法并不能检测出各种异物。 2．为了解决X射线CT异物检测的准确性问题，采用了医用X射线CT扫描仪。基于点扩散函数的系统误差和基于比尔定律的分类误差，明确了CT扫描仪对异物的检出极限。 3．为了检查异物的可检测性，测量了软X射线透射和反射光谱。通过测试材料的软X射线透射光谱，对于异物的检测精度较好。并通过测试材料的软X射线反射光谱，获得了材料独特的软X射线性能。 4．组装了一台带有微焦点系统的软X射线CT试验机，并重新构建了500张图像作为CT图像。微焦点系统实现了小于100微米的分辨率，被认为能够检测食品中薄而小的非金属材料。