| LATTA, Peter, Zenon STARCUK, Marco L. H. GRUWEL, Michael H. WEBER a Boguslaw TOMANEK. K-space trajectory mapping and its application for ultrashort Echo time imaging. MAGNETIC RESONANCE IMAGING. NEW YORK: ELSEVIER SCIENCE INC, 2017, roč. 36, February, s. 68-76. ISSN 0730-725X. Dostupné z: https://dx.doi.org/10.1016/j.mri.2016.10.012. |
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@article{1375728,
author = {Latta, Peter and Starcuk, Zenon and Gruwel, Marco L. H. and Weber, Michael H. and Tomanek, Boguslaw},
article_location = {NEW YORK},
article_number = {February},
doi = {http://dx.doi.org/10.1016/j.mri.2016.10.012},
keywords = {Gradient imperfections; K-space deviation; Trajectory estimation; Ultrashort echo time (UTE)},
language = {eng},
issn = {0730-725X},
journal = {MAGNETIC RESONANCE IMAGING},
title = {K-space trajectory mapping and its application for ultrashort Echo time imaging},
url = {http://www.sciencedirect.com/science/article/pii/S0730725X1630159X},
volume = {36},
year = {2017}
}
TY - JOUR
ID - 1375728
AU - Latta, Peter - Starcuk, Zenon - Gruwel, Marco L. H. - Weber, Michael H. - Tomanek, Boguslaw
PY - 2017
TI - K-space trajectory mapping and its application for ultrashort Echo time imaging
JF - MAGNETIC RESONANCE IMAGING
VL - 36
IS - February
SP - 68-76
EP - 68-76
PB - ELSEVIER SCIENCE INC
SN - 0730725X
KW - Gradient imperfections
KW - K-space deviation
KW - Trajectory estimation
KW - Ultrashort echo time (UTE)
UR - http://www.sciencedirect.com/science/article/pii/S0730725X1630159X
L2 - http://www.sciencedirect.com/science/article/pii/S0730725X1630159X
N2 - MR images are affected by system delays and gradient field imperfections which induce discrepancies between prescribed and actual k-space trajectories. This could be even more critical for non-Cartesian data acquisitions where even a small deviation from the assumed k-space trajectory results in severe image degradation and artifacts. Knowledge of the actual k-space trajectories is therefore crucial and can be incorporated in the reconstruction of high quality non-Cartesian images. A novel MR method for the calibration of actual gradient waveforms was developed using a combination of phase encoding increments and subsequent detection of the exact time point at which the corresponding trajectory is crossing the k-space origin. The measured sets of points were fitted to a parametrical model to calculate the complete actual acquisition trajectory. Measurements performed on phantoms and volunteers, positioned both in- and off-isocenter of the magnet, clearly demonstrate the improvement in reconstructed ultrashort echo time (UTE) images, when information from calibration of k-space sampling trajectories is employed in the MR image reconstruction procedure. The unique feature of the proposed method is its robustness and simple experimental setup, making it suitable for quick acquisition trajectory calibration procedures e.g. for non-Cartesian radial fast imaging. (C) 2016 Elsevier Inc. All rights reserved.
ER -
LATTA, Peter, Zenon STARCUK, Marco L. H. GRUWEL, Michael H. WEBER a Boguslaw TOMANEK. K-space trajectory mapping and its application for ultrashort Echo time imaging. \textit{MAGNETIC RESONANCE IMAGING}. NEW YORK: ELSEVIER SCIENCE INC, 2017, roč.~36, February, s.~68-76. ISSN~0730-725X. Dostupné z: https://dx.doi.org/10.1016/j.mri.2016.10.012.
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