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Maintaining Image Quality While Reducing Acoustic Noise and Switched Gradient Field Exposure During Lumbar MRI
Umeå University, Faculty of Medicine, Department of Nursing. Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.ORCID iD: 0000-0002-7480-770X
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
Umeå University, Faculty of Medicine, Department of Nursing. Umeå University, Faculty of Medicine, Umeå Centre for Functional Brain Imaging (UFBI).
2021 (English)In: Journal of Magnetic Resonance Imaging, ISSN 1053-1807, E-ISSN 1522-2586, Vol. 54, no 1, p. 315-325Article in journal (Refereed) Published
Abstract [en]

Background: MR-generated acoustic noise can contribute to patient discomfort and potentially be harmful. One way to reduce this noise is by altering the gradient output and/or waveform using software optimization. Such modifications might influence image quality and switched gradient field exposure, and different techniques appear to affect sound pressure levels (SPLs) to various degrees.

Purpose: To evaluate SPLs, image quality, switched gradient field exposure, and participants' perceived noise levels during two different acoustic noise reduction (ANR) techniques, Quiet Suite (QS) and Whisper Mode (WM), and to compare them with conventional T2-weighted turbo spin echo (T2W TSE) of the lumbar spine.

Design: Prospective.

Subjects: Forty adults referred for lumbar MRI.

Field strength/sequence: Conventional T2W TSE, T2W TSE with QS, and T2W TSE with WM were acquired at 1.5 T.

Assessment: Peak SPL (A-weighted decibels, dBA), perceived noise levels (Borg CR10®-scale), signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), three radiologists' qualitative assessments in image quality on an ordinal scale 1-4, switched gradient field exposure (% general public), and gradient currents were measured. Interobserver reliability was reported as percentage agreement.

Statistical tests: Repeated measures ANOVA, Friedman's ANOVA, and Wilcoxon's Signed-Rank Test for acoustic noise measurements and image quality assessments.

Results: Mean peak SPLs were 89.9 dBA, 74.3 dBA, and 78.8 dBA for conventional, QS, and WM, respectively (P < 0.05). Participants perceived QS as the quietest and conventional as the loudest sequence (P < 0.05). No qualitative differences in image quality were seen (P > 0.05), although QS showed significantly improved SNR and CNR (P < 0.05). Switched gradient field exposure was reduced by 66% and 48% for QS and WM, respectively.

Data conclusion: Without degrading image quality, both QS and WM are viable ANR techniques in lumbar T2W TSE. QS provided the lowest SPL, the lowest gradient field exposure and was perceived as the most silent among the three sequences.

Level of evidence: 1 TECHNICAL EFFICACY STAGE: 5.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. Vol. 54, no 1, p. 315-325
Keywords [en]
MRI safety, magnetic field, patient comfort, quiet suite, whisper mode
National Category
Nursing
Identifiers
URN: urn:nbn:se:umu:diva-179857DOI: 10.1002/jmri.27527ISI: 000616367300001PubMedID: 33565199Scopus ID: 2-s2.0-85100635401OAI: oai:DiVA.org:umu-179857DiVA, id: diva2:1527503
Available from: 2021-02-11 Created: 2021-02-11 Last updated: 2022-05-12Bibliographically approved

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Glans, AntonWilén, JonnaLindgren, Lenita

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