Physics-based constraints for correction of geometric distortions in gradient echo EP images via nonrigid registration

Yong Li; Ning Xu; J. Michael Fitzpatrick; Victoria L. Morgan; David R. Pickens; Benoit M. Dawant

doi:10.1117/12.652260

10 March 2006 Physics-based constraints for correction of geometric distortions in gradient echo EP images via nonrigid registration

Yong Li, Ning Xu, J. Michael Fitzpatrick, Victoria L. Morgan, David R. Pickens, Benoit M. Dawant

Author Affiliations +

Proceedings Volume 6144, Medical Imaging 2006: Image Processing; 61442I (2006) https://doi.org/10.1117/12.652260
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

Geometric distortion is a well-recognized problem in echo planar (EP) images. One strategy for the correction of these distortions is to register an EP image to a reference image, such as a high resolution anatomical MR image in which geometric distortion is minimal. Non-rigid registration methods, which warp images locally, have been used for this purpose. While a physics-based distortion model for spin-echo (SE) EP image has been developed and used as a constraint in nonrigid registration algorithms, such a model for gradient-echo (GE) EP image has not been investigated. Here, we propose to use a physics-based model for GE EP image that incorporates a term that takes dephasing into consideration. To evaluate this technique, we generate a distortion-free EP image using an MR simulator we have developed. We then distort the image and modify its intensity values using a real field map and an analytical expression that includes dephasing. The geometric distortion computed from the field map is used as the ground truth to which the deformation fields obtained with our method is compared. We show that including the dephasing term improves the results.

Citation Download Citation

Yong Li, Ning Xu, J. Michael Fitzpatrick, Victoria L. Morgan, David R. Pickens, and Benoit M. Dawant "Physics-based constraints for correction of geometric distortions in gradient echo EP images via nonrigid registration", Proc. SPIE 6144, Medical Imaging 2006: Image Processing, 61442I (10 March 2006); https://doi.org/10.1117/12.652260

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available