caa a22 4500 606187626 CHVBK 20210128100841.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00405-014-3232-y doi (NATIONALLICENCE)springer-10.1007/s00405-014-3232-y 3Tesla magnetic resonance imaging noise in standard head and neck sequence does not cause temporary threshold shift in high frequency [Elektronische Daten] [Elizabeth Lim, Ing Tang, Mohammadreza Peyman, Norlisah Ramli, Prepageran Narayanan, Raman Rajagopalan] High acoustic noise level is one of the unavoidable side effects of 3T magnetic resonance imaging (MRI). A case of hearing loss after 3T MRI has been reported in this institution and hence this study. The objective of this study was to determine whether temporary threshold shift (TTS) in high frequency hearing occurs in patients undergoing 3T MRI scans of the head and neck. A total of 35 patients undergoing head and neck 3T MRI for various clinical indications were tested with pure tone audiometry in different frequencies including high frequencies, before and after the MRI scan. Any threshold change from the recorded baseline of 10dB was considered significant. All patients were fitted with foamed 3M earplugs before the procedure following the safety guidelines for 3T MRI. The mean time for MRI procedure was 1,672s (range 1,040-2,810). The noise dose received by each patient amounted to an average of 3,906.29% (1,415-9,170%). The noise dose was derived from a normograph used by Occupational Noise Surveys. This was calculated using the nomograph of L eq, L EX, noise dose and time. There was no statistically significant difference between the hearing threshold before and after the MRI procedures for all the frequencies (paired t test, P>0.05). For patients using 3M foamed earplugs, noise level generated by 3T MRI during routine clinical sequence did not cause any TTS in high frequency hearing. Springer-Verlag Berlin Heidelberg, 2014 High frequency hearing loss nationallicence Temporary threshold shift nationallicence 3T magnetic resonant imaging nationallicence Lim Elizabeth ORL Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut Tang Ing ORL Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut Peyman Mohammadreza Opthalmology Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut Ramli Norlisah Department of Diagnostic and Bioimaging, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut Narayanan Prepageran ORL Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut Rajagopalan Raman ORL Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut European Archives of Oto-Rhino-Laryngology Springer Berlin Heidelberg 272/11(2015-11-01), 3109-3113 0937-4477 272:11<3109 2015 272 405 https://doi.org/10.1007/s00405-014-3232-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 review-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00405-014-3232-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lim Elizabeth ORL Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut NATIONALLICENCE 700 1- Tang Ing ORL Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut NATIONALLICENCE 700 1- Peyman Mohammadreza Opthalmology Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut NATIONALLICENCE 700 1- Ramli Norlisah Department of Diagnostic and Bioimaging, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut NATIONALLICENCE 700 1- Narayanan Prepageran ORL Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut NATIONALLICENCE 700 1- Rajagopalan Raman ORL Department, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia aut NATIONALLICENCE 773 0- European Archives of Oto-Rhino-Laryngology Springer Berlin Heidelberg 272/11(2015-11-01), 3109-3113 0937-4477 272:11<3109 2015 272 405