Variable field of view for spatial resolution improvement in continuously moving table magnetic resonance imaging. |
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Authors: | Houchun H Hu Ananth J Madhuranthakam David G Kruger James F Glockner Stephen J Riederer |
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Affiliation: | Magnetic Resonance Imaging Laboratory, Department of Radiology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA. |
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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 Deltak(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. |
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Keywords: | continuously moving table spatial resolution variable field of view peripheral contrast‐enhanced MRA k‐space interpolation |
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