K-space trajectory mapping and its application for ultrashort Echo time imaging

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F17%3A00470615" target="_blank" >RIV/68081731:_____/17:00470615 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14740/17:00094674

Result on the web

<a href="http://dx.doi.org/10.1016/j.mri.2016.10.012" target="_blank" >http://dx.doi.org/10.1016/j.mri.2016.10.012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mri.2016.10.012" target="_blank" >10.1016/j.mri.2016.10.012</a>

Result language

angličtina

Original language name

K-space trajectory mapping and its application for ultrashort Echo time imaging

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20601 - Medical engineering

Project

<a href="/en/project/GA15-12607S" target="_blank" >GA15-12607S: Design and optimization of ultra-short echo-time sequence for reliable detection of myelin content in the human brain by magnetic resonance imaging.</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Magnetic Resonance Imaging

ISSN

0730-725X

e-ISSN

—

Volume of the periodical

36

Issue of the periodical within the volume

February

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

68-76

UT code for WoS article

000393536100010

EID of the result in the Scopus database

2-s2.0-84994508591