Critical sampling in ROSE scanning

The acquisition of unaliased ROSE (Radially Oriented Sinusoidal Excursions in k‐space) data requires the appropriate selection of a gradient frequency, number of interleaves, and number of data samples per acquisition. When the data samples are uniformly distributed in time, they fall on irregularly...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2000-07, Vol.44 (1), p.129-136
Main Author: Sarty, Gordon E.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Computer Simulation
Fourier Analysis
Fourier transform
Image Processing, Computer-Assisted - methods
Investigative techniques, diagnostic techniques (general aspects)
k-space
Magnetic Resonance Imaging - methods
Mathematics
Medical sciences
Miscellaneous. Technology
Phantoms, Imaging
radial acquisition
Radiodiagnosis. Nmr imagery. Nmr spectrometry
reconstruction
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Summary:The acquisition of unaliased ROSE (Radially Oriented Sinusoidal Excursions in k‐space) data requires the appropriate selection of a gradient frequency, number of interleaves, and number of data samples per acquisition. When the data samples are uniformly distributed in time, they fall on irregularly spaced circles in k‐space. Aliasing due to radial undersampling will be eliminated when the number of sample circles equals the number of pixels in one dimension of the desired reconstructed image. Azimuthal aliasing will be completely eliminated when the total number of ROSE petals is four times the number of pixels in one dimension, but acceptable reconstructions may be had with fewer petals. Magn Reson Med 44:129–136, 2000. © 2000 Wiley‐Liss, Inc.
ISSN:0740-3194
1522-2594
DOI:10.1002/1522-2594(200007)44:1<129::AID-MRM19>3.0.CO;2-2