アジア圏で開催される国際学会での研究発表のススメ
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概要
- 論文の詳細を見る
Purpose:This study was performed to develop a computerized method to optimize imaging conditions and image quality based onsimulation images. We tried to develop a prototype system and ensure consistency between the resulting images and actual imagesobtained using a digital X-ray imaging system.Methods and Materials:An RQA5 X-ray spectrum was used for determination of input-output characteristic and noise power spectrum (NPS) in anindirect-type flat-panel detector (FPD) system. The relationship between tube current-time product (mAs), exposure dose at thedetector surface, and pixel values of images was addressed and a conversion function was then created. The incident quantumnumbers determined from the conversion function were input into random values generator and image noise was simulated. Simulationimages provided at different noise levels were compared with the actual images provided by use of the FPD system, objectivelyand subjectively.Results:Average NPS of actual image in each dose level were 5.39×10－6，6.77×10－6, and 3.46×10－5 and those of simulation imagewere 1.10×10－6, 4.53×10－6, and 4.41×10－5, respectively. In observers study, both images showed almost the same signal detectabilitywhich decreased with decreasing exposure dose. It was confirmed that image noise was simulate almost properly.Conclusions:The present system could allow us to estimate necessary dose from image quality and also to estimate image quality fromexposure dose. These results suggested that appropriate exposure dose could be determined based on necessary image quality usingthe simulation images.
- Japanese Society of Radiological Technology = 日本放射線技術学会の論文
- 2012-02-20
著者
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田中 利恵
金沢大学医学部保健学科
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Matsubara Kosuke
Department Of Radiological Technology Kanazawa University Hospital:department Of Radiological Techno
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Ichikawa Katsuhiro
Department Of Health Sciences Graduate School Of Medical Science Kanazawa University
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Kawashima Hiroki
Department Of Fermentation Technology Faculty Of Engineering Hiroshima University
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Matsubara Kosuke
Department Of Radiological Technology School Of Health Sciences College Of Medical Pharmaceutical And Health Sciences Kanazawa University
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