| Item type |
文献 / Documents(1) |
| 公開日 |
2024-07-18 |
| アクセス権 |
|
|
アクセス権 |
open access |
| 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 |
| 出版社版DOI |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.3390/s23073472 |
|
|
言語 |
ja |
|
|
関連名称 |
10.3390/s23073472 |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| タイトル |
|
|
タイトル |
Influence of Pitch on Surface Dose Distribution and Image Noise of Computed Tomography Scans |
|
言語 |
en |
| 著者 |
山田, 健二
河田, 佳樹
天野, 雅史
鈴木, 秀宣
富永, 正英
佐々木, 幹治
ニシヤマ, ヒカル
原田, 雅史
仁木, 登
|
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
This study evaluated the effect of pitch on 256-slice helical computed tomography (CT) scans. Cylindrical water phantoms (CWP) were measured using axial and helical scans with various pitch values. The surface dose distributions of CWP were measured, and reconstructed images were obtained using filtered back-projection (FBP) and iterative model reconstruction (IMR). The image noise in each reconstructed image was decomposed into a baseline component and another component that varied along the z-axis. The baseline component of the image noise was highest at the center of the reconstructed image and decreased toward the edges. The normalized 2D power spectra for each pitch were almost identically distributed. Furthermore, the ratios of the 2D power spectra for IMR and FBP at different pitch values were obtained. The magnitudes of the components varying along the z-axis were smallest at the center of the reconstructed image and increased toward the edge. The ratios of the 3D power spectra on the fx axis for IMR and FBP at different pitch values were obtained. The results showed that the effect of the pitch was related to the component that varied along the z-axis. Furthermore, the pitch had a smaller effect on IMR than on FBP. |
|
言語 |
en |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
helical computed tomography |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
pitch |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
surface dose distribution |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
FBP |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
IMR |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
image noise |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
power spectrum |
| 書誌情報 |
en : Sensors
巻 23,
号 7,
p. 3472,
発行日 2023-03-26
|
| 収録物ID |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
14248220 |
| 出版者 |
|
|
出版者 |
MDPI |
|
言語 |
en |
| 権利情報 |
|
|
言語 |
en |
|
権利情報 |
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
| EID |
|
|
識別子 |
394801 |
|
識別子タイプ |
URI |
| 言語 |
|
|
言語 |
eng |
sensors_23_7_3472.pdf (2.85 MB)
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