Motion compensation for non-gated helical CT: application to lung imaging

M. Grass; R. Bippus; A. Thran; D. Schäfer; S. Kabus; K. M. Brown

doi:10.1117/12.2292879

9 March 2018 Motion compensation for non-gated helical CT: application to lung imaging

M. Grass, R. Bippus, A. Thran, D. Schäfer, S. Kabus, K. M. Brown

Proceedings Volume 10573, Medical Imaging 2018: Physics of Medical Imaging; 105733H (2018) https://doi.org/10.1117/12.2292879
Event: SPIE Medical Imaging, 2018, Houston, Texas, United States

Abstract

Computed tomography (CT) imaging of the thorax is a common application of CT in radiology. Most of these scans are performed with a helical scan protocol. A significant number of images suffer from motion artefacts due to the inability of the patients to hold their breath or due to hiccups or coughing. Some images become nondiagnostic while others are simply degraded in quality. In order to correct for these artefacts a motion compensated reconstruction for non-periodic motion is required.

For helical CT scans with a pitch smaller or equal to one the redundancy in the helical projection data can be used to generate images at the identical spatial position for multiple time points. As the scanner moves across the thorax during the scan, these images do not have a fixed time point, but a well-defined temporal distance inbetween the images. Using image based registration a motion vector field can be estimated based on these images. The motion artefacts are corrected in a subsequent motion compensated reconstruction. The method is tested on mathematical phantom data (reconstruction) and clinical lung scans (motion estimation and reconstruction).

Citation Download Citation

M. Grass, R. Bippus, A. Thran, D. Schäfer, S. Kabus, and K. M. Brown "Motion compensation for non-gated helical CT: application to lung imaging", Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 105733H (9 March 2018); https://doi.org/10.1117/12.2292879

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