Quiet MRI with novel acoustic noise reduction

Katsunuma, A; Takamori, H.; Sakakura, Y; Hamamura, Y.; Ogo, Yoshiaki; Katayama, Reiji

doi:10.1007/bf02678588

Cited by 46 publications

(34 citation statements)

References 9 publications

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“…[20][21][22] The structural features of the gradient unit, such as special sound insulation, and the material and construction of the coil circuit and support structures, also aŠect the transmission and propagation of acoustic noise. 13,[17][18][19]23,24 Technologies to reduce MR scanning sound Developments to reduce the acoustic noise of MR systems have been carried out in both hard-ware development of the gradient magneticˆeld system and pulse sequence techniques. The more generalized approach is hardware improvements of gradient magneticˆeld system.…”

Section: Discussionmentioning

confidence: 99%

A Survey Analysis of Acoustic Trauma Related to MR Scans

et al. 2012

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Purpose: The maximum limit of MR scanner noise and necessity of ear protection is dened in the IEC standard (IEC60601-2-33) of MR safety. With improvements in MR scanner performance, pulse sequences generating higher scanning noise have been used clinically. In this study, we investigated the factors signiˆcantly related to potential acoustic trauma cases (PATC) after MR examinations. To consider the future direction for MR safety and prevention of acoustic trauma, issues related to noise generation by MR scanners and acoustic trauma were systematically reviewed.Methods: A statistical analysis was performed using the data set from a survey (n＝974) conducted in 2010 by the JSMRM safety committee. Hierarchical clustering analysis was used to extract the characteristics of the responders. With this classiˆcation as a reference, tests of independence and a residual analysis were employed to evaluate the factors related to PATC.Results: No signiˆcant relationship was observed between the ear protection policy and the incidence or the reported outcome of PATC. While the two main clusters out of the six clusters extracted were associated with who reported the PATC and the conˆrmation process of the acoustic noise level of MR scanners, no cluster was associated with the frequency of PATC. An absence of PATC was signiˆcantly less reported (p＝0.03) and more PATC was reported (p＝0.04) by facilities with 3T MR systems.Discussion: Although the total frequency was 4 cases, it should be noted that persistent hearing disturbances are a possible consequence of MR examinations. Neither the condition of the subjects nor the ear protection method was signiˆcantly related to the probability of PATC, suggesting the di‹culty of predicting the potential risk of acoustic trauma. It is recommended to more systematically follow up PATC cases and clarify the risk factors.

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Section: Discussionmentioning

confidence: 99%

A Survey Analysis of Acoustic Trauma Related to MR Scans

et al. 2012

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“…[12][13][14] Other studies evaluated the so-called active noise control. By the superposition of a sound (antinoise) that is exactly the inverse of the original sound (antiphase acoustic waves), the original noise can be cancelled.…”

Section: Introductionmentioning

confidence: 99%

Comparison of image quality characteristics on Silent MRversusconventional MR imaging of brain lesions at 3 Tesla

Ohlmann-Knafo¹,

Morlo²,

Tárnoki³

et al. 2016

BJR

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“…One straightforward method is to change the design of the gradient coil, because it is well known that this noise is caused by vibration of the gradient coil due to the Lorentz forces generated by the current in a gradient coil placed in a static magneticˆeld. 12 Katsunuma et al 13 have conˆrmed that MRI noise can be substantially reduced by sealing the gradient coil in a vacuum chamber to block airborne vibration propagation. This is achieved by supporting the gradient coil independently to block solid vibration propagation.…”

Section: Introductionmentioning

confidence: 99%

Silent fMRI Acquisition Methods for Large Acoustic Noise during Scan

Okada

Nakai

2003

magn reson med sci

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Functional magnetic resonance imaging (fMRI) is now the method of choice for studying neural correlates of various tasks in normal subjects as well as patients. This method, however, is inevitably coupled with the acoustic noise produced during the image acquisition process. This is a problem not only in auditory experiments but also in other cognitive tasks in general. The problems caused by such noise are modulation of auditory activation, impaired perception of auditory stimuli, and deterioration of task performance possibly due to stress from the abnormal circumstances. While both hardware and software solutions have been reported, several methods are introduced here that focus on software solutions that can be implemented in scanners already installed. Their advantages and disadvantages diŠer depending on the kinds of tasks involved, i.e. whether block design or event-related design, and they are discussed with a view to better utilization.

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Quiet MRI with novel acoustic noise reduction

Cited by 46 publications

References 9 publications

A Survey Analysis of Acoustic Trauma Related to MR Scans

A Survey Analysis of Acoustic Trauma Related to MR Scans

Comparison of image quality characteristics on Silent MRversusconventional MR imaging of brain lesions at 3 Tesla

Silent fMRI Acquisition Methods for Large Acoustic Noise during Scan

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