Local correction of non-periodic motion in computed tomography

Colas Schretter; Christoph Neukirchen; Georg Rose; Matthias Bertram

doi:10.1117/12.810255

13 March 2009 Local correction of non-periodic motion in computed tomography

Colas Schretter, Christoph Neukirchen, Georg Rose, Matthias Bertram

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72582M (2009) https://doi.org/10.1117/12.810255
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

This paper presents a new iterative motion correction technique composed of motion estimation in projection space, motion segmentation in image space, and motion compensation within an analytical filtered-backprojection (FBP) image reconstruction algorithm. The motion is estimated by elastic registration of acquired projections on reference projections. Reference projections are sampled from the image, reconstructed in a previous iteration step. To apply the motion compensation locally, the image regions significantly affected by motion are segmented. First the perceived motion is identified in projection space by computing the absolute difference between acquired line integrals and reference line integrals. Then, differences are reconstructed in image space, and the image is regularized with a pipeline of standard image processing operators. The result of this procedure is a normalized motion map, associating each image element with a measure of the local motion detected there. The estimated displacement vectors in projection space and the reconstructed motion map in image space are then used by an adaptive motion-compensated FBP algorithm to reconstruct a sharper image. Results are shown qualitatively and quantitatively for reconstructions from realistic projections, simulated from clinical patient data. Since the method does not assume any periodicity of the motion model, it can correct reconstruction artifacts due to unstructured patient motion, such as breath-hold failure, abdominal contractions, and nervous movements.

Citation Download Citation

Colas Schretter, Christoph Neukirchen, Georg Rose, and Matthias Bertram "Local correction of non-periodic motion in computed tomography", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72582M (13 March 2009); https://doi.org/10.1117/12.810255

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
12 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Fourier transforms

Computed tomography

Reconstruction algorithms

Image segmentation

Medical imaging

Motion estimation

Image filtering

Show All Keywords

Keywords/Phrases

Search In:

Publication Years