Abstract
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.
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