MRIにおけるSNRの空間周波数特性の評価

フォーマット:

論文

責任表示:

宮地, 利明 ; 藤田, 広志 ; 真田, 茂 ; 越田, 吉郎 ; 春日, 敏夫

言語:

日本語

出版情報:

医用画像情報学会 = MII: Japan Society of Medical Imaging and Information Sciences, 2001-01-01

著者名:

• 宮地, 利明
• 藤田, 広志
• 真田, 茂
• 越田, 吉郎
• 春日, 敏夫

掲載情報:

医用画像情報学会雑誌 = Medical Imaging and Information Sciences

ISSN:

0910-1543      

巻:

18

通号:

2

開始ページ:

87

終了ページ:

92

バージョン:

publisher

概要:

A method was developed to accurately measure signal-to-noise ratios (SNRs) in positive and negative frequencies of magnetic resonance images (MRIs). SNR2(f) was calculated from the modulation transfer function (MTF) and the Wiener spectrum, both of which were determined with subtracted complex images at the same phantom setting. The SNR2(f)s in the conventional spin echo (SE) and Turbo SE which set effective echo time at the first echo were evaluated by changing … the T2 of the phantom in the frequency and phase encode directions. SNR2s gave positive and negative spatial frequency information that was not obtained with conventional methods. In this method, the influences of image nonuniformity and unnecessary artifacts could be eliminated. Analysis of the SNR in the spatial frequency domain made it possible to obtain more detail on the image quality of MRI. 続きを見る

URL:

http://hdl.handle.net/2297/36644