Title:
尤度最大化を利用した画像位置合わせ(registration)システム及び方法
Document Type and Number:
Japanese Patent JP2004508856
Kind Code:
A
Abstract:
An image processing system and method employs a registration processor (130) to calculate a statistical measure of likelihood for two volumetric images (110, 112). The likelihood is calculated based on an assumption that the voxel values in two images in registration are probabilitically related. The likelihood is calculated for a plurality of relative transformations in iterative fashion until a transformation that maximizes the likelihood is found. The transformation that maximizes the likelihood provides an optimal registration and the parameters for the optimized transform are output to memory (150) for use by a display system (160) in aligning the images for display as a fused or composite image. If statistics about the relationship between the involved images are known, a mutation probability can be derived and used in the likelihood calculation. If there is no such prior knowledge, the mutation probability can be estimated purely from the image data. All voxel pairs in the overlapping volume or, alternatively, a portion of it can be used to compute the likelihood. The optimized likelihood has a simple and less abstract interpretation and can be further used to provide an indication of the quality of the registration.
Inventors:
Ju, Yang-Min
Kochov, Stephen M
Kochov, Stephen M
Application Number:
JP2002527450A
Publication Date:
March 25, 2004
Filing Date:
September 13, 2001
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G01R33/32; A61B5/00; A61B5/055; A61B6/03; G01T1/161; G06T3/00; G06T7/00; G06T19/00; (IPC1-7): A61B5/055; A61B5/00; A61B6/03; G01R33/32; G06T17/40
Domestic Patent References:
| JPH08294485A | 1996-11-12 | |||
| JPH10305015A | 1998-11-17 | |||
| JP2000040145A | 2000-02-08 | |||
| JPH10340348A | 1998-12-22 |
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Shinsuke Onuki
Tadashige Ito