Use of a computer-controlled motion phantom to investigate the temporal and spatial fidelity of HYPR processing
Article first published online: 8 MAR 2013
Copyright © 2013 Wiley Periodicals, Inc.
Magnetic Resonance in Medicine
Volume 71, Issue 2, pages 702–710, February 2014
How to Cite
Keith, L., Rahimi, M., Holmes, J., Brittain, J. and Korosec, F. (2014), Use of a computer-controlled motion phantom to investigate the temporal and spatial fidelity of HYPR processing. Magn Reson Med, 71: 702–710. doi: 10.1002/mrm.24707
- Issue published online: 13 JAN 2014
- Article first published online: 8 MAR 2013
- Manuscript Accepted: 5 FEB 2013
- Manuscript Revised: 4 FEB 2013
- Manuscript Received: 10 AUG 2012
- contrast-enhanced MRA;
- phantom study
In this work, we investigate the spatial and temporal fidelity of highly constrained backPRojection (HYPR) processing using a computer-controlled motion phantom. The goal of this experimental set-up was to provide not only well-defined temporal dynamics and spatial characteristics of the motion phantom, but also circumstances that imitate in vivo scenarios.
The phantom was designed to represent an artery flanked on both sides by vein. Both arterial and venous components have different temporal dynamics but are confluent, which corresponds to a difficult scenario for HYPR. Spatial and temporal fidelity was investigated by measuring signal intensity profiles through the phantom both orthogonal to as well as along the direction of motion.
Spatial fidelity profiles measured from the HYPR processed images yielded full-width-at-half-maximum values very similar to those measured in non-HYPR-processed images. Furthermore, there was no significant spreading of the motion phantom leading edge in HYPR processed images.
Although HYPR processing has certain characteristic artifacts that are discussed, the technique can be used to improve image quality of highly undersampled time frame images with minimal loss of spatial or temporal fidelity. Magn Reson Med 71:702–710, 2014. © 2013 Wiley Periodicals, Inc.