Device For Protecting The Hearing From Loud Mrt Sounds

Schreiber, Axel

doi:10.1121/1.3573332

Cited by 1 publication

(3 citation statements)

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“…Dampening methods to reduce the noise level emitted by the MRI scanner incur high cost, are difficult to implement, increase the scan time, and may impair the signal quality. Until now, there are no methods that protect the patient's hearing without additional patient discomfort or penalties in costs, image quality or scan time [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it also does not guarantee an effective protection of the hearing organs against loud MRI noise peaks. Recognizing this problem, Schreiber [3] suggests using a power audio amplifier and loudspeakers to generate so-called protective sounds, which rise slowly in amplitude, thus increasing the impedance in the middle ear directly before the onsets of the loud MRI sounds. This invention makes use of the middle ear reflex-a mechanism the hearing of vertebrates possesses, where at high sound pressure the impedance of the auditory is adjusted to attenuate the vibration amplitudes of the small bones and tympanic membrane in the middle ear.…”

Section: Introductionmentioning

confidence: 99%

“…This invention makes use of the middle ear reflex-a mechanism the hearing of vertebrates possesses, where at high sound pressure the impedance of the auditory is adjusted to attenuate the vibration amplitudes of the small bones and tympanic membrane in the middle ear. Even though the patent [3] mentions that music may be used as a protective sound, it does not disclose a method to avoid an erratic and thereby unpleasant mixing of music and the regular noise emerging out of an MRI scanner.…”

Section: Introductionmentioning

confidence: 99%

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Constraint-Based Time-Scale Modification of Music Recordings for Noise Beautification

et al. 2018

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In magnetic resonance imaging (MRI), a patient is exposed to beat-like knocking sounds, often interrupted by periods of silence, which are caused by pulsing currents of the MRI scanner. In order to increase the patient's comfort, one strategy is to play back ambient music to induce positive emotions and to reduce stress during the MRI scanning process. To create an overall acceptable acoustic environment, one idea is to adapt the music to the locally periodic acoustic MRI noise. Motivated by this scenario, we consider in this paper the general problem of adapting a given music recording to fulfill certain temporal constraints. More concretely, the constraints are given by a reference time axis with specified time points (e.g., the time positions of the MRI scanner's knocking sounds). Then, the goal is to temporally modify a suitable music recording such that its beat positions align with the specified time points. As one technical contribution, we model this alignment task as an optimization problem with the objective to fulfill the constraints while avoiding strong local distortions in the music. Furthermore, we introduce an efficient algorithm based on dynamic programming for solving this task. Based on the computed alignment, we use existing timescale modification procedures for locally adapting the music recording. To illustrate the outcome of our procedure, we discuss representative synthetic and real-world examples, which can be accessed via an interactive website. In particular, these examples indicate the potential of automated methods for noise beautification within the MRI application scenario.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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