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Analytical image reconstruction of cone-beam projections from limited angle Compton camera data
https://repo.qst.go.jp/records/53321
https://repo.qst.go.jp/records/53321cbb03054-b9ce-43ff-9921-92ffe4415f9b
| Item type | 会議発表論文 / Conference Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2004-05-05 | |||||
| タイトル | ||||||
| タイトル | Analytical image reconstruction of cone-beam projections from limited angle Compton camera data | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_5794 | |||||
| 資源タイプ | conference paper | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Tomitani, Takehiro
× Tomitani, Takehiro× Hirasawa, Masahiko× 富谷 武浩× 平澤 雅彦 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Since the integration of gamma-rays on a cone is measured with Compton cameras, some sort of image reconstruction method is necessary. Parra developed an analytical reconstruction algorithm based on a spherical-harmonics expansion of projection data that covers the entire scattering-angle range. The scattering-angle range is limited due to the electrical noise of the detector and due to the finite detector configuration. In this article, a reconstruction algorithm from the projection of a limited scattering-angle range is presented. The algorithm is based on an inversion of the summed back-projection. The variance of the reconstructed image of a uniform source was analyzed and is proportional to the third power of the number of expansion terms. Thus, window functions are introduced to suppress noise at the cost of spatial resolution. The dependency of the spatial resolution on the number of expansion terms was analyzed. The dependency of the variance on the spatial resolution was found to be that variance is proportional to (spatial resolution)^(-1/3). |
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| 書誌情報 |
IEEE Nuclear Science Symposium Conference Record : Nuclear Science Symposium, Medical Imaging Conference 巻 2002, p. M11-105, 発行日 2003-05 |
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