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Short-term effects experienced during examinations in an actively shielded 7 T MR

Journal article
Authors B. Hansson
P. Hoglund
K. M. Bloch
M. Nilsson
J. Olsrud
J. Wilen
Isabella M Björman Burtscher
Published in Bioelectromagnetics
Volume 40
Issue 4
Pages 234-249
ISSN 0197-8462
Publication year 2019
Published at Institute of Clinical Sciences, Department of Radiology
Pages 234-249
Language en
Links dx.doi.org/10.1002/bem.22189
Keywords dizziness, peripheral nerve stimulation, motion, patient compliance, bias, static magnetic-fields, occupational-exposure, subjective acceptance, stray fields, scanners, vertigo, safety, tesla, Life Sciences & Biomedicine - Other Topics, Biophysics
Subject categories Radiology, Nuclear Medicine and Medical Imaging

Abstract

The objective of this study was to evaluate occurrence and strength of short-term effects experienced by study participants in an actively shielded (AS) 7 tesla (7 T) magnetic resonance (MR) scanner, to compare results with earlier reports on passively shielded (PS) 7 T MR scanners, and to outline possible healthcare strategies to improve patient compliance. Study participants (n = 124) completed a web-based questionnaire directly after being examined in an AS 7 T MR (n = 154 examinations). Most frequently experienced short-term effects were dizziness (84%) and inconsistent movement (70%), especially while moving into or out of the magnet. Peripheral nerve stimulation (PNS)-twitching-was experienced in 67% of research examinations and showed a dependence between strength of twitches and recorded predicted PNS values. Of the participants, 74% experienced noise levels as acceptable and the majority experienced body and room temperature as comfortable. Of the study participants, 95% felt well-informed and felt they had had good contact with the staff before the examination. Willingness to undergo a future 7 T examination was high (>90%). Our study concludes short-term effects are often experienced during examinations in an AS 7 T MR, leaving room for improvement in nursing care strategies to increase patient compliance. Bioelectromagnetics. 2019;9999:XX-XX. (c) 2019 The Authors. Bioelectromagnetics Published by Wiley Periodicals, Inc.

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