Optimized Control of X-ray Exposure and Image Noise Using a Particular Multislice CT Scanner
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概要
- 論文の詳細を見る
Patient dose reduction in computed tomography (CT) always results in a trade off between radiation exposure and image quality. There are few reports that estimate the relationship between image quality and X-ray exposure in CT examinations as one optimal index. The purpose of this study was to determine the optimal parameter settings enabling a low radiation exposure without compromising image quality using a particular 4-row multislice CT (MSCT) scanner (Aquilion VZ 4-slice CT scanner, Toshiba Medical Systems Corporation, Otawara, Tochigi, Japan). Normalized dose divided by image noise for helical pitches (nDNR: normalized dose to noise ratio) were calculated in consideration of beam collimation and tube current-time product. Optimal tube current-time product was calculated using the nDNR for the helical pitches based on user-defined standards of quality of the CT image. As a result, the nDNR proved to be well-supported to decrease the patient exposure in various exposure conditions of MSCT scans; however, the dose and image noise did not show a linear relation to the helical pitch. In conclusion, nDNR can be applied to patient dose reduction while keeping an acceptable image quality using a particular 4-row MSCT scanner.
- 社団法人日本放射線技術学会の論文
- 2008-08-20
著者
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山本 修司
国立がんセンター がん予防・検診研究センター
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Kakinuma Ryutaro
National Cancer Center Tokyo Jpn
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Yamamoto Shuji
National Cancer Center
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Suzuki Masahiro
National Cancer Center
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Moriyama Noriyuki
National Cancer Center
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Koyama Yoshihiro
Department of Radiology, Osaka University Hospital
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Nagasawa Hirofumi
Division of Diagnostic Radiology, National Cancer Center Hospital
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Yamamoto Shuji
Research Center For Cancer Prevention And Screening National Cancer Center
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Sato Y
Division Of Image Analysis Graduate School Of Medicine Osaka University
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Yamamoto Shuji
大阪大学 医学系研究科保健学専攻
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Moriyama N
National Cancer Research Center For Cancer Prevention And Screening
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Moriyama Noriyuki
National Cancer Center Tokyo Jpn
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Koyama Yoshihiro
Department Of Radiology Osaka University Hospital
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Kakinuma Ryutaro
National Cancer Center Research Center For Cancer Prevention And Screening(3rd Term Comprehensive 10
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Kakinuma Ryutaro
National Cancer Center Hospital East
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Nagasawa Hirofumi
Division Of Diagnostic Radiology National Cancer Center Hospital
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Suzuki Masahiro
Research Center For Cancer Prevention And Screening National Cancer Center
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Sato Yoshinobu
Division Of Image Analysis Department Of Medical Engineering Osaka University Graduate School Of Med
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Moriyama Noriyuki
Screening Technology And Development Division Research Center For Cancer Prevention And Screening National Cancer Center
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山本 修司
National Cancer Center, Research Center for Cancer Prevention and Screening(3rd Term Comprehensive 10- Year Strategy for Cancer Control)
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SUZUKI Masahiro
National Agricultural Research Center for the Tohoku Region, National Agricultural and Bio-Oriented Research Organization
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