2012 Fiscal Year Final Research Report
Research on inter-scanner difference and improvement of quantitative analysis for multi-center study inpositron emission tomography.
| Project/Area Number |
22611019
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Medical Physics/Radiological Technology
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| Research Institution | Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology |
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Principal Investigator |
ODA Keiichi 地方独立行政法人東京都健康長寿医療センター(東京都健康長寿医療センター研究所), 東京都健康長寿医療センター研究所, 研究員 (70224235)
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| Co-Investigator(Renkei-kenkyūsha) |
ISHII Kenji 地方独立行政法人東京都健康長寿医療センター(東京都健康長寿医療センター研究所), 東京都健康長寿医療センター研究所, 研究部長 (10231135)
SAKATA Muneyuki 地方独立行政法人東京都健康長寿医療センター(東京都健康長寿医療センター研究所), 東京都健康長寿医療センター研究所, 研究員 (00403329)
KIMURA Yuichi 独立行政法人放射線医学総合研究所, 分子イメージング研究センター, チームリーダ (60205002)
NISHIO Tomoyuki 財団法人先端医療振興財団, 先端医療センター研究所, 研究員 (20470205)
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| Project Period (FY) |
2010 – 2012
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| Keywords | PET / PET/CT / 定量測定 / 装置関差 / マルチセンター |
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| Research Abstract |
We showed scanner dependence of brain 18F-FDG and 11C-PiB images by using phantom examination with nine kinds of PET scanners. We used two types of phantoms, cylindrical phantom with 15cm inside diameter and three-dimensional brain phantom, and we set the body phantom on the bed to examine the effect of scatter and random coefficients from outside of the axial field of view (AFOV). Radioactivity and distance of the two phantoms were determined by a pilot study to obtain a condition similar to clinical study. Axial uniformity was evaluated by circular region of interest (ROI) of 12cm diameter, set in the center of the reconstruction image of the cylindrical phantom. As a result, the standardized uptake value (SUV) was lower than the true value in some scanners, and there was a scanner in which the axial uniformity was deteriorated by high radioactivity outside the AFOV. In the cylindrical phantom, the axial uniformity of the scanner was improved using the new dead-time correction method; however, it was not improved in the 3D brain phantom. Quality-controlled PET scanners are important to maintain constant levels for multicenter studies.
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