MRIシステムのファントムにおけるCNR測定法の基礎評価―改良CNR評価法の提案
Many methods of measuring contrast-to-noise ratio (CNR) in magnetic resonance imaging (MRI) have been proposed. However, it is not clear which method is best for evaluating clinical or phantom images. In this study we examined the characteristics of the methods of evaluation proposed in the past, an...
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| Published in | 日本放射線技術学会雑誌 Vol. 64; no. 2; pp. 268 - 276 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | Japanese |
| Published |
公益社団法人 日本放射線技術学会
2008
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0369-4305 1881-4883 |
| DOI | 10.6009/jjrt.64.268 |
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| Abstract | Many methods of measuring contrast-to-noise ratio (CNR) in magnetic resonance imaging (MRI) have been proposed. However, it is not clear which method is best for evaluating clinical or phantom images. In this study we examined the characteristics of the methods of evaluation proposed in the past, and we proposed new CNR evaluation method that improved noise evaluation. We examined the relationship of theoretical CNR value and measurement value when measurement sensitivity was changed. We measured the relationship between number of signal averaged (NSA) and value of CNR. The CNR value changed greatly according to where noise was measured. The measuring method that we proposed in this study was superior for the following reasons: the measurement point of noise and signal are the same; the influence of the low frequency element is slight; and the correlation of measurements and theoretical value is high. The method that we proposed in this study is useful for evaluating phantom images. |
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| AbstractList | Many methods of measuring contrast-to-noise ratio (CNR) in magnetic resonance imaging (MRI) have been proposed. However, it is not clear which method is best for evaluating clinical or phantom images. In this study we examined the characteristics of the methods of evaluation proposed in the past, and we proposed new CNR evaluation method that improved noise evaluation. We examined the relationship of theoretical CNR value and measurement value when measurement sensitivity was changed. We measured the relationship between number of signal averaged (NSA) and value of CNR. The CNR value changed greatly according to where noise was measured. The measuring method that we proposed in this study was superior for the following reasons: the measurement point of noise and signal are the same; the influence of the low frequency element is slight; and the correlation of measurements and theoretical value is high. The method that we proposed in this study is useful for evaluating phantom images. |
| Author | 宮地, 利明 和田, 陽一 原, 孝則 |
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| Copyright | 2008 公益社団法人 日本放射線技術学会 |
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| References | 5）日本放射線技術学会 編：放射線医療技術学叢書18 MR撮像技術：よりよい画像を得るために．pp.229-230，日本放射線技術学会出版委員会，京都，（2000 16) Bernheim RA, Brown TH, Gutowsky HS, et al.: Temperature dependence of proton relaxation times in aqueous solutions of paramagnetic ions. J Chem Phys, 30 (4),950-956, (1959). 13) National Electrical Manufacturers Association : Determination of signal-to-noise ratio (SNR) in diagnostic magnetic resonance imaging. NEMA Standards Publication MS 1-2001, (2001). 10）小倉明夫，東田満治，山崎 勝，他：MR画像における各種CNR算出法と信号検出能の関係．日放技学誌，54（6），778-783，（1998 11) Schär M, Kozerke S, Fischer SE, et al.: Cardiac SSFP imaging at 3 Tesla. Magn Reson Med, 51 (4), 799-806, (2004). 7）小倉明夫，前田富美恵，宮井 明，他：MRI臨床画像のCNR測定法に関する精度．日放技学誌，60（11），1543-1549, （2004 9) Wolff SD, and Balaban RS: Assesing conrast on MR images. Radiology, 202 (1), 25-29, (1997). 3) EEC Concerted Research Project: Identification and characterization of biological tissues by NMR. Concerted research project of the European Economic Community. IV. Protocols and test objects for the assessment of MRI equipment Magnetic Resonance Imaging, 6, 195-199, (1998). 8）宮地利明：ディジタル時代の画像評価の基礎と応用．7． MRIの画像評価，日放技学誌，58（1），40-48，（2002 14) Price RR, Axel L, Morgan T, et al. : Quality assurance methods and phantoms for magnetic resonance imaging: report of AAPM nuclear magnetic resonance Task Group No. 1. Med Phys, 17 (2), 287-295, (1990). 4）西沢かな枝，福田信夫，蜂谷順一，他：MR画像におけるコントラスト・ノイズ比（CNR）の評価，日磁医誌，8，4，（1989 1) Constable RT, and Henkelman RM: Contrast, resolution, and detectability in MR imaging. J Comput Assist Tomogr, 15 (2), 297-303, (1991). 12) Kellman P, Larson AC, Hsu LY, et al.: Motion-corrected free-breathing delayed enhancement imaging of myocardial infarction. Magn Reson Med, 53 (1), 194-200, (2005). 6）日本放射線技術学会 編：臨床放射線技術実験ハンドブック（上）．pp. 531-535，通商産業研究社，東京，（1996 15）井澤 章，新田 優，安達一美，他：常磁性金属イオンを含むT1値測定用標準物質の基礎的検討について．NMR医学，4S，80-81，（1984 2) Hendrick RE, Kneeland JB, and Stark DD: Maximizing signal-to-noise and contrast-to-noise ratios in FLASH imaging. Magn Reson Imaging, 5 (2), 117-127, (1987). |
| References_xml | – reference: 9) Wolff SD, and Balaban RS: Assesing conrast on MR images. Radiology, 202 (1), 25-29, (1997). – reference: 15）井澤 章，新田 優，安達一美，他：常磁性金属イオンを含むT1値測定用標準物質の基礎的検討について．NMR医学，4S，80-81，（1984）． – reference: 4）西沢かな枝，福田信夫，蜂谷順一，他：MR画像におけるコントラスト・ノイズ比（CNR）の評価，日磁医誌，8，4，（1989）． – reference: 2) Hendrick RE, Kneeland JB, and Stark DD: Maximizing signal-to-noise and contrast-to-noise ratios in FLASH imaging. Magn Reson Imaging, 5 (2), 117-127, (1987). – reference: 8）宮地利明：ディジタル時代の画像評価の基礎と応用．7． MRIの画像評価，日放技学誌，58（1），40-48，（2002）． – reference: 16) Bernheim RA, Brown TH, Gutowsky HS, et al.: Temperature dependence of proton relaxation times in aqueous solutions of paramagnetic ions. J Chem Phys, 30 (4),950-956, (1959). – reference: 14) Price RR, Axel L, Morgan T, et al. : Quality assurance methods and phantoms for magnetic resonance imaging: report of AAPM nuclear magnetic resonance Task Group No. 1. Med Phys, 17 (2), 287-295, (1990). – reference: 7）小倉明夫，前田富美恵，宮井 明，他：MRI臨床画像のCNR測定法に関する精度．日放技学誌，60（11），1543-1549, （2004）． – reference: 6）日本放射線技術学会 編：臨床放射線技術実験ハンドブック（上）．pp. 531-535，通商産業研究社，東京，（1996）． – reference: 3) EEC Concerted Research Project: Identification and characterization of biological tissues by NMR. Concerted research project of the European Economic Community. IV. Protocols and test objects for the assessment of MRI equipment Magnetic Resonance Imaging, 6, 195-199, (1998). – reference: 5）日本放射線技術学会 編：放射線医療技術学叢書18 MR撮像技術：よりよい画像を得るために．pp.229-230，日本放射線技術学会出版委員会，京都，（2000）． – reference: 13) National Electrical Manufacturers Association : Determination of signal-to-noise ratio (SNR) in diagnostic magnetic resonance imaging. NEMA Standards Publication MS 1-2001, (2001). – reference: 11) Schär M, Kozerke S, Fischer SE, et al.: Cardiac SSFP imaging at 3 Tesla. Magn Reson Med, 51 (4), 799-806, (2004). – reference: 1) Constable RT, and Henkelman RM: Contrast, resolution, and detectability in MR imaging. J Comput Assist Tomogr, 15 (2), 297-303, (1991). – reference: 10）小倉明夫，東田満治，山崎 勝，他：MR画像における各種CNR算出法と信号検出能の関係．日放技学誌，54（6），778-783，（1998）． – reference: 12) Kellman P, Larson AC, Hsu LY, et al.: Motion-corrected free-breathing delayed enhancement imaging of myocardial infarction. Magn Reson Med, 53 (1), 194-200, (2005). |
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| Snippet | Many methods of measuring contrast-to-noise ratio (CNR) in magnetic resonance imaging (MRI) have been proposed. However, it is not clear which method is best... |
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| SubjectTerms | contrast-to-noise ratio (CNR) image noise magnetic resonance imaging (MRI) signal-to-noise ratio (SNR) theoretical value |
| Title | MRIシステムのファントムにおけるCNR測定法の基礎評価―改良CNR評価法の提案 |
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