K-space trajectory calibration for improved precision of quantitative ultrashort echo time imaging

0477999 - ÚPT 2018 RIV SK eng C - Konferenční příspěvek (zahraniční konf.)
Latta, P. - Starčuk jr., Zenon - Gruwel, M. - Tomanek, B.
K-space trajectory calibration for improved precision of quantitative ultrashort echo time imaging.
11th International Conference on Measurement, Measurement 2017. Proceedings. Bratislava: Institute of Measurement Science SAS, 2017, s. 197-200. ISBN 978-80-972629-0-7.
[Measurement 2017. International Conference on Measurement /11./. Smolenice (SK), 29.05.2017-31.05.2017]
Grant CEP: GA ČR(CZ) GA15-12607S
Institucionální podpora: RVO:68081731
Klíčová slova: ultrashort Echo Time (UTE) * K-space Trajectory Calibration * proton Density
Obor OECD: Medical engineering

Ultrashort echo time imaging (UTE) is often the method of choice for measurement of short-lived T2 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.
Trvalý link: http://hdl.handle.net/11104/0274226