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Assessment of temporal resolution of multi-detector row computed tomography in helical acquisition mode using the impulse method
http://hdl.handle.net/2297/43457
http://hdl.handle.net/2297/43457cbbed33f-4f0e-4331-8a02-df3c8d1df87a
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ME-PR-ICHIKAWA-K-374.pdf (786.5 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2017-10-03 | |||||
| タイトル | ||||||
| タイトル | Assessment of temporal resolution of multi-detector row computed tomography in helical acquisition mode using the impulse method | |||||
| 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 | |||||
| 著者 |
Ichikawa, Katsuhiro
× Ichikawa, Katsuhiro× Hara, Takanori× Urikura, Atsushi× Takata, Tadanori× Ohashi, Kazuya |
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| 書誌情報 |
Physica Medica 巻 31, 号 4, p. 374-381, 発行日 2015-06-01 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1120-1797 | |||||
| NCID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA11064306 | |||||
| DOI | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1016/j.ejmp.2015.02.012 | |||||
| 出版者 | ||||||
| 出版者 | Associazione Italiana di Fisica Medica / Elsevier | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The purpose of this study was to propose a method for assessing the temporal resolution (TR) of multi-detector row computed tomography (CT) (MDCT) in the helical acquisition mode using temporal impulse signals generated by a metal ball passing through the acquisition plane. An 11-mm diameter metal ball was shot along the central axis at approximately 5m/s during a helical acquisition, and the temporal sensitivity profile (TSP) was measured from the streak image intensities in the reconstructed helical CT images. To assess the validity, we compared the measured and theoretical TSPs for the 4-channel modes of two MDCT systems. A 64-channel MDCT system was used to compare TSPs and image quality of a motion phantom for the pitch factors P of 0.6, 0.8, 1.0 and 1.2 with a rotation time R of 0.5s, and for two R/. P combinations of 0.5/1.2 and 0.33/0.8. Moreover, the temporal transfer functions (TFs) were calculated from the obtained TSPs. The measured and theoretical TSPs showed perfect agreement. The TSP narrowed with an increase in the pitch factor. The image sharpness of the 0.33/0.8 combination was inferior to that of the 0.5/1.2 combination, despite their almost identical full width at tenth maximum values. The temporal TFs quantitatively confirmed these differences. The TSP results demonstrated that the TR in the helical acquisition mode significantly depended on the pitch factor as well as the rotation time, and the pitch factor and reconstruction algorithm affected the TSP shape. © 2015 Associazione Italiana di Fisica Medica. | |||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Embargo Period 12 months | |||||
| 権利 | ||||||
| 権利情報 | Copyright © Elsevier (CC-BY NC ND) | |||||
| 著者版フラグ | ||||||
| 出版タイプ | AM | |||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
| 関連URI | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.elsevier.com/locate/issn/11201797 | |||||
