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Magnetic Resonance Materials in Physics, Biology and Medicine

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12-06-2023 | Research Article

Concomitant field compensation of spiral turbo spin-echo at 0.55 T

Authors: Rajiv Ramasawmy, John P. Mugler III, Ahsan Javed, Zhixing Wang, Daniel A. Herzka, Craig H. Meyer, Adrienne E. Campbell-Washburn

Published in: Magnetic Resonance Materials in Physics, Biology and Medicine | Issue 3/2023

Abstract

Objective

Diagnostic-quality neuroimaging methods are vital for widespread clinical adoption of low field MRI. Spiral imaging is an efficient acquisition method that can mitigate the reduced signal-to-noise ratio at lower field strengths. As concomitant field artifacts are worse at lower field, we propose a generalizable quadratic gradient-field nulling as an echo-to-echo compensation and apply it to spiral TSE at 0.55 T.

Materials and methods

A spiral in–out TSE acquisition was developed with a compensation for concomitant field variation between spiral interleaves, by adding bipolar gradients around each readout to minimize phase differences at each refocusing pulse. Simulations were performed to characterize concomitant field compensation approaches. We demonstrate our proposed compensation method in phantoms and (n = 8) healthy volunteers at 0.55 T.

Results

Spiral read-outs with integrated spoiling demonstrated strong concomitant field artifacts but were mitigated using the echo-to-echo compensation. Simulations predicted a decrease of concomitant field phase RMSE between echoes of 42% using the proposed compensation. Spiral TSE improved SNR by 17.2 ± 2.3% compared to reference Cartesian acquisition.

Discussion

We demonstrated a generalizable approach to mitigate concomitant field artifacts for spiral TSE acquisitions via the addition of quadratic-nulling gradients, which can potentially improve neuroimaging at low-field through increased acquisition efficiency.

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Title: Concomitant field compensation of spiral turbo spin-echo at 0.55 T
Authors: Rajiv Ramasawmy
John P. Mugler III
Ahsan Javed
Zhixing Wang
Daniel A. Herzka
Craig H. Meyer
Adrienne E. Campbell-Washburn
Publication date: 12-06-2023
Publisher: Springer International Publishing
Published in: Magnetic Resonance Materials in Physics, Biology and Medicine / Issue 3/2023
Print ISSN: 0968-5243
Electronic ISSN: 1352-8661
DOI: https://doi.org/10.1007/s10334-023-01103-0

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Concomitant field compensation of spiral turbo spin-echo at 0.55 T

Abstract

Objective

Materials and methods

Results

Discussion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objective

Materials and methods

Results

Discussion

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