Optimization of diffusion‐weighted single‐refocused spin‐echo EPI by reducing eddy‐current artifacts and shortening the echo time

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15110%2F18%3A73589937" target="_blank" >RIV/61989592:15110/18:73589937 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s10334-018-0684-x" target="_blank" >http://dx.doi.org/10.1007/s10334-018-0684-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10334-018-0684-x" target="_blank" >10.1007/s10334-018-0684-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Optimization of diffusion‐weighted single‐refocused spin‐echo EPI by reducing eddy‐current artifacts and shortening the echo time

Popis výsledku v původním jazyce

Abstract Objective The purpose of this work was to optimize the acquisition of diffusion-weighted (DW) single-refocused spin-echo (srSE) data without intrinsic eddy-current compensation (ECC) for an improved performance of ECC postprocessing. The rationale is that srSE sequences without ECC may yield shorter echo times (TE) and thus higher signal-to-noise ratios (SNR) than srSE or twice-refocused spin-echo (trSE) schemes with intrinsic ECC. Materials and methods The proposed method employs dummy scans with DW gradients to drive eddy currents into a steady state before data acquisition. Parameters of the ECC postprocessing algorithm were also optimized. Simulations were performed to obtain minimum TE values for the proposed sequence and sequences with intrinsic ECC. Experimentally, the proposed method was compared with standard DW-trSE imaging, both in vitro and in vivo. Results Simulations showed substantially shorter TE for the proposed method than for methods with intrinsic ECC when using shortened echo readouts. Data of the proposed method showed a marked increase in SNR. A dummy scan duration of at least 1.5 s improved performance of the ECC postprocessing algorithm. Conclusion Changes proposed for the DW-srSE sequence and for the parameter setting of the postprocessing ECC algorithm considerably reduced eddy-current artifacts and provided a higher SNR.

Název v anglickém jazyce

Optimization of diffusion‐weighted single‐refocused spin‐echo EPI by reducing eddy‐current artifacts and shortening the echo time

Popis výsledku anglicky

Abstract Objective The purpose of this work was to optimize the acquisition of diffusion-weighted (DW) single-refocused spin-echo (srSE) data without intrinsic eddy-current compensation (ECC) for an improved performance of ECC postprocessing. The rationale is that srSE sequences without ECC may yield shorter echo times (TE) and thus higher signal-to-noise ratios (SNR) than srSE or twice-refocused spin-echo (trSE) schemes with intrinsic ECC. Materials and methods The proposed method employs dummy scans with DW gradients to drive eddy currents into a steady state before data acquisition. Parameters of the ECC postprocessing algorithm were also optimized. Simulations were performed to obtain minimum TE values for the proposed sequence and sequences with intrinsic ECC. Experimentally, the proposed method was compared with standard DW-trSE imaging, both in vitro and in vivo. Results Simulations showed substantially shorter TE for the proposed method than for methods with intrinsic ECC when using shortened echo readouts. Data of the proposed method showed a marked increase in SNR. A dummy scan duration of at least 1.5 s improved performance of the ECC postprocessing algorithm. Conclusion Changes proposed for the DW-srSE sequence and for the parameter setting of the postprocessing ECC algorithm considerably reduced eddy-current artifacts and provided a higher SNR.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30210 - Clinical neurology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE

ISSN

0968-5243

e-ISSN

—

Svazek periodika

2018

Číslo periodika v rámci svazku

31

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

585-597

Kód UT WoS článku

000444406200001

EID výsledku v databázi Scopus

2-s2.0-85044591593