Quality control in Positron Emitting Tracer Imaging System (PETIS) examination for quantification analysis of plant physiological functions

PETISによる植物機能定量解析を可能にするクォリティコントロール

河地 有木; 藤巻 秀; 鈴井 伸郎; 石井 里美; 渡邉 茂樹; 渡辺 智; 石岡 典子; 松橋 信平

Kawachi, Naoki; Fujimaki, Shu; Suzui, Nobuo; Ishii, Satomi; Watanabe, Shigeki; Watanabe, Satoshi; Ishioka, Noriko; Matsuhashi, Shimpei

The PETIS and its quantitative tracer images have the potential to analyze the plant physiology of a test plant. In order to acquire the analyzable dynamic data of PETIS images quantitatively, a scheduled work for constant quality controls are absolutely essential. The system uniformity and sensitivity on the plane of field of view (FOV) were measured using a flat uniform phantom. As a result of the activity dependence, we made a modification to the PETIS software in the sensitivity correction, and we recommend the following algorism; in some measurements for the plant study having very low-activity tracer, it may be preferable to correct sensitivity with low-activity phantom data. At the same time, the quantitative performance of PETIS is checked with time activity curves of the 18F phantom images. The TACs represented a linearity was kept for approximately 10 times of the half-life, that is the quantitatively dynamic rage of PETIS had between from 20 kBq to 20 MBq, strictly.