Variable field of view for spatial resolution improvement in continuously moving table magnetic resonance imaging
✍ Scribed by Houchun H. Hu; Ananth J. Madhuranthakam; David G. Kruger; James F. Glockner; Stephen J. Riederer
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 475 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
An approach is described in which the field of view (FOV) along the Y (right/left) phase encoding direction can be dynamically altered during a continuously moving table (CMT) coronal acquisition for extended FOV MRI. We hypothesize that with this method, regions of the anatomy exhibiting significantly different lateral widths can be imaged with a matching local FOV~Y~, thereby improving local lateral spatial resolution. k‐space raw data from the variable‐FOV CMT acquisition do not allow simple Fourier reconstruction due to the presence of a mixture of phase encodes sampled at different Δ__k__~Y~ intervals. In this work, we employ spline interpolation to reregister the mixed data set onto a uniformly sampled k‐space grid. Using this interpolation scheme, we present phantom and peripheral contrast‐enhanced MR angiography results demonstrating an approximate 45% improvement in local lateral spatial resolution for continuously moving table acquisitions. Magn Reson Med 54:146–151, 2005. © 2005 Wiley‐Liss, Inc.