Effect of MRI noise on cochlear function

Radomskij, Paul; Schmidt, María Auxiliadora; Heron, Christine; Prasher, Deepak

doi:10.1016/s0140-6736(02)08423-4

Cited by 60 publications

(56 citation statements)

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“…3 In extreme cases, permanent hearing impairment can occur. [3][4][5] Noise is of particular concern in populations vulnerable to hearing loss such as the very young and elderly and those who may not be able to manage the effectiveness of earplug placement such as patients with psychiatric disorders or reduced levels of consciousness. 5 Fetal noise exposure is also a concern.…”

mentioning

confidence: 99%

Quiet PROPELLER MRI Techniques Match the Quality of Conventional PROPELLER Brain Imaging Techniques

Corcuera‐Solano

Doshi

Pawha

et al. 2015

AJNR Am J Neuroradiol

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BACKGROUND AND PURPOSE:Switching of magnetic field gradients is the primary source of acoustic noise in MR imaging. Sound pressure levels can run as high as 120 dB, capable of producing physical discomfort and at least temporary hearing loss, mandating hearing protection. New technology has made quieter techniques feasible, which range from as low as 80 dB to nearly silent. The purpose of this study was to evaluate the image quality of new commercially available quiet T2 and quiet FLAIR fast spin-echo PROPELLER acquisitions in comparison with equivalent conventional PROPELLER techniques in current day-to-day practice in imaging of the brain.

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mentioning

confidence: 99%

Quiet PROPELLER MRI Techniques Match the Quality of Conventional PROPELLER Brain Imaging Techniques

Corcuera‐Solano

Doshi

Pawha

et al. 2015

AJNR Am J Neuroradiol

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show abstract

“…It is reported that the sound pressure level (SPL) of the acoustic noise can exceed 130 dB in some scanners [11], which is the pain threshold of normal human hearing [12]. The loud noise emitted during scanning may be unpleasant or cause patient discomfort, and also may damage the patient's auditory system if not well protected [13][14][15][16]. Therefore, efficient acoustic noise reduction methods are necessary to be applied to MRI scanners.…”

Section: From Gradient Coil Design To Acoustic Noise Controlmentioning

confidence: 99%

“…However, this design has a higher complexity in terms of the mechanical design. Apart from considering the electromagnetic performance of the gradient coil design, the amount of noise generated by the coil also needs to be considered in the design process to improve patient comfort for seriously ill or anxious patients [13][14][15][16]112].…”

Section: Introductionmentioning

confidence: 99%

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Gradient coil design and acoustic noise control in magnetic resonance imaging systems

Wang¹

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In magnetic resonance imaging (MRI), three-dimensional linearly varied magnetic field gradients are required in the imaging volume, for the encoding of the spatial information of the imaged object.The gradient magnetic field is generated by gradient coils, whose performance directly affects the final MR image quality. Modern MRI applications demand gradient coils to be designed with higher performance such as a faster slew rate for rapid imaging, and fewer system interactions to ensure distortion-free images.During MR imaging, the gradient coil current switches quickly and the alternating current under a strong magnetic field generates a large Lorentz force, thus increasing the vibrations and noise in the gradient assembly, and the vibrations can also transmit to other components in the system. Moreover, the gradient magnetic field induces eddy currents on the surrounding conductive materials, resulting in further mechanical vibration. The sound pressure level (SPL) of an MRI scanner very commonly exceeds 100 dB, which may be discomforting to patients. Therefore, an effective acoustic noise control is necessary for the MRI operation.This thesis attempts to design a novel gradient coil system in an MRI scanner with a particular focus on the investigation of an acoustic noise control scheme. A brief summary of the thesis work is as follows.(1) Gradient coil design A conventional cylindrical MRI scanner has a long patient bore, which may make some patients uneasy due to claustrophobia. In order to alleviate this, an asymmetric gradient coil was proposed to accommodate an asymmetric MRI magnet. The coil was designed with a number of features, for example, to enable the installation of the shim tray, the coil was configured with one end connected and the other end separated. The electromagnetic and acoustic performances were also improved compared with a conventional non-connected coil system.The stream function approach is commonly used in gradient coil design, but an issue with this design is a connection problem between coil loops. To eliminate the field errors due to the coil connections, this thesis proposed a novel spiral coil design scheme, including both transverse coils and a longitudinal coil. The proposed coil design method was not only able to improve the magnetic II performance of the coil, but also could integrate the cooling system into the coil design using hollow wires in the discrete wire space.Wire spacing is a major engineering problem in gradient coil design. Conventional gradient coils are designed with three primary layers and three shielding layers, and in general, primary transverse coils are located in two layers separated by a very dense wire structure. In this thesis, a novel gradient coil design strategy using a layer-sharing scheme was proposed. This design scheme mutually combined the x and y gradient coil layers, effectively utilizing the unoccupied or sparse coil-layer space. The new method was modelled in the case of an asymmetric head coil design, and enhanced coil performan...

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“…During some scans, when patients have been exposed to high sound levels, adverse effects have also been reported [201,177]. Current guidelines [98] state "there is little risk of a permanent threshold shift in hearing in those exposed to noise associated with MRI procedures on a one-off or occasional basis".…”

Section: High Noise Levelsmentioning

confidence: 99%

A High Order Finite Element Coupled Multi-Physics Approach To MRI Scanner Design

Bagwell¹

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Effect of MRI noise on cochlear function

Cited by 60 publications

References 1 publication

Quiet PROPELLER MRI Techniques Match the Quality of Conventional PROPELLER Brain Imaging Techniques

Quiet PROPELLER MRI Techniques Match the Quality of Conventional PROPELLER Brain Imaging Techniques

Gradient coil design and acoustic noise control in magnetic resonance imaging systems

A High Order Finite Element Coupled Multi-Physics Approach To MRI Scanner Design

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