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- W2051280442 abstract "Abstract The projection reconstruction (PR) trajectory was investigated for the effect of gradient timing delays between the actual and requested start time of each physical gradient. Radial trajectories constructed with delayed gradients miss the center of k ‐space in an angularly dependent manner, causing effective echo times to vary with projection angle. The gradient timing delays were measured in phantoms, revealing delays on the x, y, and z gradients which differed by as much as 5 μsec. Using this one‐time calibration measurement, the trajectories were corrected for gradient delays by addition of compensatory gradient areas to the prephasers of the logical x and y readout gradients. Effective projection‐to‐projection echo time variability was reduced to less than 1 μsec for all imaging orientations. Using corrected trajectories, artifacts were reduced in phantom images and in volunteer studies. This correction should potentiate greater clinical use of the PR trajectory. Magn Reson Med 50:1–6, 2003. Published 2003 Wiley‐Liss, Inc." @default.
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- W2051280442 date "2003-06-13" @default.
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- W2051280442 title "Centering the projection reconstruction trajectory: Reducing gradient delay errors" @default.
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- W2051280442 doi "https://doi.org/10.1002/mrm.10501" @default.
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