Projection reconstruction techniques for reduction of motion effects in MRI

Projection reconstruction (PR) techniques are shown to have intrinsic advantages over spin-warp (2DFT) methods with respect to diminished artifacts from respiratory motion. The benefits result from (1) portrayal of artifacts as radial streaks, with the amplitude smallest near the moving elements; (2...

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Bibliographic Details
Published inMagnetic resonance in medicine Vol. 28; no. 2; p. 275
Main Authors Glover, G H, Pauly, J M
Format Journal Article
LanguageEnglish
Published United States 01.12.1992
Subjects
Abdomen - anatomy & histology
Adipose Tissue
Algorithms
Fourier Analysis
Humans
Image Enhancement - methods
Image Processing, Computer-Assisted
Magnetic Resonance Imaging - methods
Models, Theoretical
Motion
Respiration
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Summary:Projection reconstruction (PR) techniques are shown to have intrinsic advantages over spin-warp (2DFT) methods with respect to diminished artifacts from respiratory motion. The benefits result from (1) portrayal of artifacts as radial streaks, with the amplitude smallest near the moving elements; (2) streak deployment perpendicular to the direction of motion of moving elements and often residing outside the anatomic boundaries of the subject; (3) inherent signal averaging of low spatial frequencies from oversampling of central k-space data. In addition, respiratory-ordered view angle (ROVA) acquisition is found to diminish residual streaking significantly by reducing interview inconsistencies. Comparisons of 2DFT and PR acquisitions are made with and without ROVA. Reconstructions from magnitude-only projections are found to have increased streaks from motion-induced phase shifts.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.1910280209