Messungen zur Geräuschbelastung in der MR-Tomographie bei 1,5 Tesla

Jh, Langkowski; Thiele, F; Maas, R.; Kooijman, Hendrik

doi:10.1055/s-2008-1047220

Cited by 3 publications

(1 citation statement)

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“…Gemessene Pegel lagen um 100 dB [3]. Schon in normalhörigen Personen wurden temporäre Hörminderungen gemessen [11].…”

Section: Risiko Zusätzlicher Lärmschädigung Durch Die Kernspintomograunclassified

Kernspintomographie bei Hörsturz

Michel

1999

HNO

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In der Ausschlußdiagnostik beim Hörsturz übertrifft die Kernspintomographie die konventionellen Röntgenaufnahmen und die Computertomographie in ihrer Sensitivität gegenüber Weichteilprozessen aller Art im Kleinhirnbrückenwinkel -aber auch gegenüber zentralen Störungen wie der Multiplen Sklerose. Diese Erkenntnis und die sich stetig erhöhende Verfügbarkeit und der Punktwertverfall haben dazu geführt, daß nach einem Hörsturzereignis immer früher und häufiger eine Kernspintomographie durchgeführt wird. In diese Richtung zielt auch der jüngst im European Archives of Otolaryngology erschienene Artikel "MAGNETIC RESONAN-CE IMAGING OF THE INNER EAR IN PATIENTS WITH IDIOPATHIC SENSORINEURAL HEARING LOSS" von R. J. Stokroos und Mitarbeitern [8]. Ein Kommentar erscheint uns hiernotwendig, damit die Kernspintomographie in der Diagnostik des Hörsturzes nicht unkritisch zur routinemäßigen Pflichtübung wird und potentielle Risiken verkannt werden.

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“…Gemessene Pegel lagen um 100 dB [3]. Schon in normalhörigen Personen wurden temporäre Hörminderungen gemessen [11].…”

Section: Risiko Zusätzlicher Lärmschädigung Durch Die Kernspintomograunclassified

Kernspintomographie bei Hörsturz

Michel

1999

HNO

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Importance of bone‐conducted sound transmission on patient hearing in the MR scanner

Moelker

Maas

Vogel

et al. 2005

Magnetic Resonance Imaging

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Purpose: to evaluate the influence of bone-conduction in the MR environment compared to a standardized acoustic environment. Materials and Methods:Acoustic noise is an unwanted side effect of MRI that is commonly tackled with passive hearing protection. In an MR scanner, however, with the patient completely surrounded by the MR sounds and in close contact with the vibrating MR table and gantry, boneconduction may increase subjective sound levels, restricting the efficacy of passive protection that reduces air-conducted noise only. A total of 10 volunteers were subjected to pure MR tones, covering the frequency range relevant for hearing and at 60 dB, generated through the MR system's gradient coils. Bone-conduction was determined for various passive damping conditions in an MR scanner and was compared to that acquired in an acoustically-calibrated environment. The contribution of mechanical vibrations to bone-conduction was determined. Also, with a microphone in the ear canal, the objective efficacy of the passive protection was measured. Results:We found no difference between the bone-conduction experiments executed inside the imager and in the acoustically-controlled environment. The overall insertion loss of the passive hearing protectors was over 20 dB with strongest effects at 0.4 and 2.5 kHz. Conclusion:As bone-conduction is not more pronounced inside the MR scanner than outside, the previous reports on the subjective evaluation of protection devices in MRI hold their validity.

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Noise in Magnetic Resonance Imaging: No Risk for Sensorineural Function But Increased Amplitude Variability of Otoacoustic Emissions

et al. 2003

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First, MRI noise does not impose a risk to hearing function under the measurement condition of a sound-damping head support or ear protectors. Second, a subtle effect is demonstrated by increased distortion product otoacoustic emission amplitude variability. Third, the increased otoacoustic emission amplitude variability is an audiometric parameter that is extremely sensitive to effects of acoustic stimulation, indicating more discrete changes in cochlear activity than pure-tone audiometry or otoacoustic emission amplitude reduction. A shift of the operation point (OP) of the outer hair cell (OHC) between basilar membrane and tectorial membrane is suggested as underlying cause.

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Messungen zur Geräuschbelastung in der MR-Tomographie bei 1,5 Tesla

Cited by 3 publications

References 0 publications

Kernspintomographie bei Hörsturz

Kernspintomographie bei Hörsturz

Importance of bone‐conducted sound transmission on patient hearing in the MR scanner

Noise in Magnetic Resonance Imaging: No Risk for Sensorineural Function But Increased Amplitude Variability of Otoacoustic Emissions

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