Affiliations: Department of Radiology, University of Pittsburgh, 200
Lothrop Street, Pittsburgh, PA 15213, USA
Note: [] Corresponding author: Yi Wang, Ph.D., Radiology, University of
Pittsburgh, PUH B-804, 200 Lothrop Street, Pittsburgh, PA 15213, USA. Tel.: +1
412 647 6803; Fax: +1 412 647 9800; E-mail: wangy3@msx.upmc.edu
Abstract: The phase ordering with automatic window selection (PAWS) algorithm
for respiratory gating in magnetic resonance imaging is improved by further
smoothing motion distribution in k-space. This is achieved
by requiring that the displacement discontinuities in
k-space and the range of displacement during the acquisition
of the center 30% region of k-space are limited to a fraction (1/3 in this
study) of the gating window. Simulation results and in vivo imaging experiments
suggest that these modifications reduce the amount of artifacts at a reasonable
cost of additional scan time as compared to the original PAWS algorithm.
