| 講演抄録/キーワード |
| 講演名 |
2009-01-19 13:30
[ポスター講演]幾何学的配置に起因する感度ムラのあるPET観測系における再構成像の画質向上 ○吉澤慎吾・小尾高史・田島英朗・山口雅浩・大山永昭(東工大) MI2008-92 |
| 抄録 |
(和) |
The conventional PET system has a symmetric configuration, however, for applying small animals it is important to increase gamma-ray detection sensitivity and we have to develop a new PET detector configuration which has asymmetric arrangement of detectors. But in that PET system, the irregularity of the detector sensitivities become large and using the MLEM method, the artifacts and the spatial dependent noise will occur in the PET images. On this report, we show a method to suppress the artifacts by controlling the difference of the convergence speed referred to the log-likelihood and a possibility of improving PET image quality in the computer simulations. |
| (英) |
The conventional PET system has a symmetric configuration, however, for applying small animals it is important to increase gamma-ray detection sensitivity and we have to develop a new PET detector configuration which has asymmetric arrangement of detectors. But in that PET system, the irregularity of the detector sensitivities become large and using the MLEM method, the artifacts and the spatial dependent noise will occur in the PET images. On this report, we show a method to suppress the artifacts by controlling the difference of the convergence speed referred to the log-likelihood and a possibility of improving PET image quality in the computer simulations. |
| キーワード |
(和) |
PET / Geometrical Arrangement of Detectors / Irregular Sensitivity / ML Method / / / / |
| (英) |
PET / Geometrical Arrangement of Detectors / Irregular Sensitivity / ML Method / / / / |
| 文献情報 |
信学技報, vol. 108, no. 385, MI2008-92, pp. 157-162, 2009年1月. |
| 資料番号 |
MI2008-92 |
| 発行日 |
2009-01-12 (MI) |
| ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
| PDFダウンロード |
MI2008-92 |