Study on x-ray computed tomography with ingredient decomposing radiography by multi-variate analysis

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360394
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Kyoto University
• Principal Investigator: KANNO Ikuo 京都大学, 工学(系)研究科(研究院), 教授 (50234167)
• Co-Investigator(Kenkyū-buntansha): IIDA Hidehiro 独立行政法人国立循環器病研究センター, 画像診断医学部, 画像診断医学部長 (30322720)
• Co-Investigator(Renkei-kenkyūsha): WATANABE Kenichi 名古屋大学, 工学研究科, 准教授 (30324461)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: X線 / コンピュータ断層撮影 / 被曝 / 透過測定

Outline of Final Research Achievements

An acrylic phantom had a diameter of 3 cm. A 5 mm diameter iodine region and a 2 mm diameter aluminum rod were in the phantom. Employed transXend detector consisted of six Si(Li) segment detectors with the dimensions of 10x10x1 mm. Two dimensional maps were obtained for acrylic-iodine thicknesses, and acrylic-aluminum thicknesses with x and y axises as ratios of measured electric currents by the segment detectors. The acrylic phantom was scanned from 0 and 90 degrees with the scan step of 0.4 mm. The thicknesses of acrylic, iodine and aluminum at each scan point were estimated, and the thickness distributions of materials were obtained. With these thickness distributions, tomographies were reconstructed by ML-EM method. With our method, tomograpies were obtained by a small number of transmission measurements.

Free Research Field

放射線物理学