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Parallel Implementation of 3-D Iterative Reconstruction With Intra-Thread Update for the jPET-D4
https://repo.qst.go.jp/records/45521
https://repo.qst.go.jp/records/4552119220988-c494-410d-80d3-64a4ed50af09
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2009-06-02 | |||||
| タイトル | ||||||
| タイトル | Parallel Implementation of 3-D Iterative Reconstruction With Intra-Thread Update for the jPET-D4 | |||||
| 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_6501 | |||||
| 資源タイプ | journal article | |||||
| 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 |
Lam, ChihFung
× Lam, ChihFung× Yamaya, Taiga× Obi, Takashi× Yoshida, Eiji× Inadama, Naoko× Shibuya, Kengo× Nishikido, Fumihiko× Murayama, Hideo× Ｌａｍ ＣｈｉｈＦｕｎｇ× 山谷 泰賀× 小尾 高史× 吉田 英治× 稲玉 直子× 澁谷 憲悟× 錦戸 文彦× 村山 秀雄 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | One way to speed-up iterative image reconstruction is by parallel computing with a computer cluster. However, as the number of computing threads increases, parallel efficiency decreases due to network transfer delay. In this paper, we proposed a method to reduce data transfer between computing threads by introducing an intra-thread update. The update factor is collected from each slave thread and a global image is updated as usual in the first K sub-iteration. In the rest of the sub-iterations, the global image is only updated at an interval which is controlled by a parameter L. In between that interval, the intra-thread update is carried out whereby an image update is performed in each slave thread locally. We investigated combinations of K and L parameters based on parallel implementation of RAMLA for the jPET-D4 scanner. Our evaluation used four workstations with a total of 16 slave threads. Each slave thread calculated a different set of LORs which are divided according to ring difference numbers. We assessed image quality of the proposed method with a hotspot simulation phantom. The figure of merit was the full-width-half-maximum of hotspots and the background normalized standard deviation. At an optimum K and L setting, we did not find significant change in the output images. We also applied the proposed method to a Hoffman phantom experiment and found the difference due to intra-thread update was negligible. With the intra-thread update, computation time could be reduced by about 23%. | |||||
| 書誌情報 |
IEEE Transactions on Nuclear Science 巻 56, 号 1, p. 129-135, 発行日 2009-02 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0018-9499 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1109/tns.2008.2010495 | |||||
