Simple compensation method for improved half-pulse excitation
profile with rephasing gradient

J 2020

Simple compensation method for improved half-pulse excitation profile with rephasing gradient

LATTA, Peter, Z. STARCUK, Martin KOJAN, M.L.H. GRUWEL, B. TOMANEK et. al.

Basic information

Original name

Simple compensation method for improved half-pulse excitation profile with rephasing gradient

Authors

LATTA, Peter (703 Slovakia, guarantor, belonging to the institution), Z. STARCUK, Martin KOJAN (703 Slovakia, belonging to the institution), M.L.H. GRUWEL, B. TOMANEK, S. TRATTNIG and V. JURAS

Edition

MAGNETIC RESONANCE IN MEDICINE, HOBOKEN, WILEY-BLACKWELL, 2020, 0740-3194

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

30103 Neurosciences

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 4.668

RIV identification code

RIV/00216224:14740/20:00116481

Organization unit

Central European Institute of Technology

DOI

http://dx.doi.org/10.1002/mrm.28233

UT WoS

000561641400001

Keywords in English

eddy current correction; gradients; half-pulse excitation; UTE imaging

Abstract

V originále

Purpose To improve the slice profile quality obtained by RF half-pulse excitation for 2D-UTE applications. Methods The overall first-order and zero-order phase errors along the slice-selection direction were obtained with the help of an optimization task to minimize the out-of-slice signal contamination from the calibration 1-dimenisonal (1D) profile data. The time-phase-error evolution was approximated from the k-space readout data, which were acquired primarily for correction of the readout trajectories during data regridding to the rectilinear grids. The correction of the slice profile was achieved by rephasing gradient pulses applied immediately after the end of excitation. The total prescan calibration typically took less than 2 minutes. Results The improved image quality using the proposed calibration method was demonstrated both on phantoms and on ankle images obtained from healthy volunteers. It was demonstrated that calibration can be performed either as a separate water phantom measurement or directly as a prescan procedure. Conclusion The slice-profile distortion from the half-pulse excitation could substantially affect the overall fidelity of 2D-UTE images. The presented experiments proved that the image quality could be substantially increased by application of the proposed slice-correction method.

Links

LM2015062, research and development project

Name: Národní infrastruktura pro biologické a medicínské zobrazování

Investor: Ministry of Education, Youth and Sports of the CR

LQ1601, research and development project

Name: CEITEC 2020 (Acronym: CEITEC2020)

Investor: Ministry of Education, Youth and Sports of the CR

Citovat

LATTA, Peter, Z. STARCUK, Martin KOJAN, M.L.H. GRUWEL, B. TOMANEK, S. TRATTNIG and V. JURAS. Simple compensation method for improved half-pulse excitation profile with rephasing gradient. MAGNETIC RESONANCE IN MEDICINE. HOBOKEN: WILEY-BLACKWELL, 2020, vol. 84, No 4, p. 1796-1805. ISSN 0740-3194. Available from: https://dx.doi.org/10.1002/mrm.28233.

@article{1680369,
   author = {Latta, Peter and Starcuk, Z. and Kojan, Martin and Gruwel, M.L.H. and Tomanek, B. and Trattnig, S. and Juras, V.},
   article_location = {HOBOKEN},
   article_number = {4},
   doi = {http://dx.doi.org/10.1002/mrm.28233},
   keywords = {eddy current correction; gradients; half-pulse excitation; UTE imaging},
   language = {eng},
   issn = {0740-3194},
   journal = {MAGNETIC RESONANCE IN MEDICINE},
   title = {Simple compensation method for improved half-pulse excitation profile with rephasing gradient},
   url = {https://onlinelibrary.wiley.com/doi/full/10.1002/mrm.28233},
   volume = {84},
   year = {2020}
}

TY  - JOUR
ID  - 1680369
AU  - Latta, Peter - Starcuk, Z. - Kojan, Martin - Gruwel, M.L.H. - Tomanek, B. - Trattnig, S. - Juras, V.
PY  - 2020
TI  - Simple compensation method for improved half-pulse excitation profile with rephasing gradient
JF  - MAGNETIC RESONANCE IN MEDICINE
VL  - 84
IS  - 4
SP  - 1796-1805
EP  - 1796-1805
PB  - WILEY-BLACKWELL
SN  - 07403194
KW  - eddy current correction
KW  - gradients
KW  - half-pulse excitation
KW  - UTE imaging
UR  - https://onlinelibrary.wiley.com/doi/full/10.1002/mrm.28233
L2  - https://onlinelibrary.wiley.com/doi/full/10.1002/mrm.28233
N2  - Purpose To improve the slice profile quality obtained by RF half-pulse excitation for 2D-UTE applications. Methods The overall first-order and zero-order phase errors along the slice-selection direction were obtained with the help of an optimization task to minimize the out-of-slice signal contamination from the calibration 1-dimenisonal (1D) profile data. The time-phase-error evolution was approximated from the k-space readout data, which were acquired primarily for correction of the readout trajectories during data regridding to the rectilinear grids. The correction of the slice profile was achieved by rephasing gradient pulses applied immediately after the end of excitation. The total prescan calibration typically took less than 2 minutes. Results The improved image quality using the proposed calibration method was demonstrated both on phantoms and on ankle images obtained from healthy volunteers. It was demonstrated that calibration can be performed either as a separate water phantom measurement or directly as a prescan procedure. Conclusion The slice-profile distortion from the half-pulse excitation could substantially affect the overall fidelity of 2D-UTE images. The presented experiments proved that the image quality could be substantially increased by application of the proposed slice-correction method.
ER  -

LATTA, Peter, Z. STARCUK, Martin KOJAN, M.L.H. GRUWEL, B. TOMANEK, S. TRATTNIG and V. JURAS. Simple compensation method for improved half-pulse excitation profile with rephasing gradient. \textit{MAGNETIC RESONANCE IN MEDICINE}. HOBOKEN: WILEY-BLACKWELL, 2020, vol.~84, No~4, p.~1796-1805. ISSN~0740-3194. Available from: https://dx.doi.org/10.1002/mrm.28233.

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