K-space Trajectory Calibration for Improved Precision of Quantitative Ultrashort Echo Time Imaging

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Authors

LATTA Peter STARCUK Z. GRUWEL M. TOMANEK Boguslaw

Year of publication 2017
Type Article in Proceedings
Conference 2017 11TH INTERNATIONAL CONFERENCE ON MEASUREMENT
MU Faculty or unit

Central European Institute of Technology

Citation
Doi http://dx.doi.org/10.23919/MEASUREMENT.2017.7983570
Keywords Ultrashort Echo Time (UTE); K-space Trajectory Calibration; Proton Density
Description Ultrashort echo time imaging (UTE) is often the method of choice for measurement of short-lived T-2 signals from biological tissues. The UTE acquisition is based on radial or spiral sampling schemes which, in general, are sensitive to small discrepancies between prescribed and actual trajectories. Such errors are usually observed as image quality degradation, visible as ghosting or intensity variation. This is even more serious for quantitative applications when intensity variation can cause serious bias in the estimation of measured parameters such as proton density (PD). Here we investigate such behavior of UTE acquisition and demonstrate that proper calibration of the gradient channels could minimize these type of the errors. Phantom experiments proved the efficiency of the application trajectory calibration approach.
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