Title:
【発明の名称】ウィーナー及び線形予測の技術を用いたハイブリッドMRイメージのT2復元とノイズ抑制
Document Type and Number:
Japanese Patent JP2672076
Kind Code:
B2
Abstract:
Hybrid imaging (HI) sequences used for magnetic resonance (MR) imaging and inherently degraded by T2 effects and additive measurement noise are enhanced. Wiener filter and linear prediction (LP) technique is used to process HI MR signals in the spatial frequency domain (K-space) and the hybrid domain respectively. Based on the average amplitude symmetry constraint of the spin echo signal, the amplitude frequency response function of the T2 distortion is estimated and used in the Wiener filter for a global T2 amplitude restoration. Then a linear prediction technique is utilized to obtain local signal amplitude and phase estimates around discontinuities of the frequency response function of the equivalent T2 distortion filter. These estimates are used to make local amplitude and phase corrections. The effectiveness of this combined technique in correcting T2 distortion and reducing the measurement noise is analyzed and demonstrated using experiments on both phantoms and humans.
Inventors:
High Gowang Chen
Application Number:
JP29565094A
Publication Date:
November 05, 1997
Filing Date:
November 04, 1994
Export Citation:
Assignee:
The Regents of the University of California
International Classes:
G01R33/54; A61B5/055; G01R33/56; G01R33/561; (IPC1-7): A61B5/055; G01R33/54
Domestic Patent References:
| JP156042A | ||||
| JP531095A |
Other References:
電子通信学会編 「情報理論」 （昭５５−１２−２０） コロナ社 Ｐ．１４１−１４６
Attorney, Agent or Firm:
Shoichi Hase (2 outside)