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Radiation Reduction and Image Quality Improvement with Iterative Reconstruction at Multidetector-row Computed Tomography
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- Kihara Satoshi
- Course of Radiological Sciences, School of Health Sciences, Kumamoto University
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- Murazaki Hiroo
- Graduate School of Health Sciences, Kumamoto University
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- Hatemura Masahiro
- Department of Radiology, Kumamoto University Hospital
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- Sakumura Hiromichi
- Department of Radiology, Japanese Red Cross, Kumamoto Health Care Center
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- Morisaki Takeyuki
- Departoment of Radiology, Inoue Orthopedic Hospital
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- Funama Yoshinori
- Department of Medical Physics, Faculty of Life Sciences, Kumamoto University
Bibliographic Information
- Other Title
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- マルチディテクタCTにおける 逐次近似画像再構成法を用いた線量低減および画質改善
- マルチディテクタ CT ニ オケル チクジ キンジ ガゾウ サイコウセイホウ オ モチイタ センリョウ テイゲン オヨビ ガシツ カイゼン
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Description
The purpose of our study was to investigate the relationship between image quality and radiation dose for the filtered backprojection (FBP) with smooth kernel and the iterative reconstruction (iDose) based on image noise, image resolution, CT number, and low-contrast detectability. We used the Catphan phantom and scanned at 65, 45, 32, and 20 mAs on a 64-detector CT. Image reconstruction algorithm and kernel were employed FBP with standard (C type) and FBP with smooth (A type) kernel as images obtained at 20–65 mAs. Regarding to 20–45 mAs, we additionally reconstructed it using the iDose. After scanning, we measured image noise, full width at half maximum (FWHM), and CT number and assessed low-contrast detectability. Image noise acquired at iDose was 10.9, 11.1, and 11.2 HU corresponding to 45, 32, and 20 mAs, respectively. Compared to FBP with standard kernel, FBP with smooth kernel increased the image noise range from 6.7 HU at 65 mAs to 12.3 HU at 20 mAs with decreasing tube current-time product. Unlike iDose and FBP with standard kernel, there was a statistically significant difference between FBP with standard and smooth kernel with respect to image resolution (P=0.002). Reconstruction algorithm of the iDose resulted in the same or better image quality improvements despite a reduction in the radiation dose compared to the FBP with standard or with smooth kernel. From our findings, iDose facilitates the reduction in radiation dose while maintaining image quality.
Journal
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- Japanese Journal of Radiological Technology
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Japanese Journal of Radiological Technology 67 (11), 1426-1432, 2011
Japanese Society of Radiological Technology
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Keywords
Details 詳細情報について
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- CRID
- 1390282681337926016
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- NII Article ID
- 10030042348
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- NII Book ID
- AN00197784
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- ISSN
- 18814883
- 03694305
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- NDL BIB ID
- 023357441
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- PubMed
- 22104234
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL Search
- Crossref
- CiNii Articles
- OpenAIRE
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- Abstract License Flag
- Disallowed