多軌道断層撮影装置(Polytome U)における照射野とGrodel効果について : 第2報散乱線含有率と断層像の画質

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The factors that affect the tomographic image quality are the X-ray beam collimation and the grid. The correlation between the thickness of a subject and the content of scattered X-rays was elucidated in our previous report. This report deals with the correlation between the content of scattered X-rays and the tomographic image on the objective plane. Conclusion 1. If the content of scattered X-rays remains unchanged, the tomographic image quality on the objective plane is constant, irrespective of the magnitude of the X-ray beam collimation, and also irrespective of whether a grid is used or not. 2. If the content of scattered X-rays is reduced, the image quality can be improved. 3. When the content of scattered X-rays is extremely low, the image quality is not influenced at all, whether a grid is used or not. 4. The tomographic image quality on the objective plane is greatly influenced by the content of scattered X-rays. If this content increases, the image quality suddenly deteriorates. 5. The special mask for photographing auditory ossicles wes test-made, contributing greatly to improvement on the tomographic image quality.
公益社団法人日本放射線技術学会の論文
1978-05-01