K-space Trajectory Calibration for Improved Precision of Quantitative Ultrashort Echo Time Imaging
| Autoři | |
|---|---|
| Rok publikování | 2017 |
| Druh | Článek ve sborníku |
| Konference | 2017 11TH INTERNATIONAL CONFERENCE ON MEASUREMENT |
| Fakulta / Pracoviště MU | |
| Citace | |
| Doi | http://dx.doi.org/10.23919/MEASUREMENT.2017.7983570 |
| Klíčová slova | Ultrashort Echo Time (UTE); K-space Trajectory Calibration; Proton Density |
| Popis | 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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