Auditory Noise Associated With MR Procedures: A Review

McJury, M.; Shellock, Frank G.

doi:10.1002/1522-2586(200007)12:1<37::aid-jmri5>3.0.co;2-i

Cited by 183 publications

(160 citation statements)

References 30 publications

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“…Firstly, machine noise, which has been previously documented as an annoyance during MRI [32,41,42], was noted by three patients. Acoustic noise reduction may be achieved with hardware-based techniques aimed at minimizing the mechanical gradient coil vibration to the rest of the system, and/or sequence-based techniques aimed at optimizing the gradient activity and avoiding acoustic resonance frequencies [43][44][45].…”

Section: Discussionmentioning

confidence: 96%

Patient Perception of Lower Limb Non-Contrast Magnetic Resonance Angiography and Digital Subtraction Angiography in Diabetic Patients with Peripheral Arterial Disease

Lukies

Richmond

Hornsey

et al. 2017

Cardiovasc Imaging Asia

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Peripheral arterial disease (PAD) is common in diabetic patients, with an estimated prevalence of 20-29% in those over 50 years of age, and causes significant morbidity, with amputation or limb loss occurring in around 4% of patients [1]. The imaging diagnosis of PAD in diabetic patients is challenging because renal impairment is common and vessels tend to be cc This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Objective: Non-contrast magnetic resonance angiography (NC-MRA) is an attractive technique for imaging peripheral arterial disease (PAD) in diabetic patients where arterial calcification and renal impairment are common. Our purpose was to evaluate patient perception of lower limb NC-MRA and compare this perception to that of digital subtraction angiography (DSA). Materials and Methods:Thirty-one diabetic patients (18 male, 13 female, mean age=69 years) with symptomatic PAD (critical ischemia, n=10) referred for DSA were prospectively recruited, and 1.5T quiescent-interval single-shot NC-MRA was performed before DSA (intervention performed during DSA, n=23). Patients rated anxiety, pain, discomfort, willingness to repeat (Likert scale: 1 most favorable to 7 least favorable), and difficulty compared to expectations (-3 better to +3 worse).Results: Twenty-nine patients' results were analyzed (DSA under general anesthesia, n=1; incomplete NC-MRA due to morbid obesity, n=1). NC-MRA and DSA median scores were 1 vs. 3, 1 vs. 2, 2 vs. 2, and 1 vs. 1 for anxiety, pain, discomfort, and willingness to repeat, respectively. The median score for difficulty compared to expectations was 0 (as expected) for both examinations. The anxiety and pain scores for NC-MRA were significantly lower than those for DSA (p=0.006 and p=0.001, respectively). Reasons for the less favorable NC-MRA experience included machine noise (n=3), pain from coil pressure (n=3), and claustrophobia (n=1).Conclusion: NC-MRA was well tolerated overall, and better than DSA for anxiety and pain. Although DSA is commonly required for intervention in PAD, NC-MRA may inform disease management and potentially obviate DSA where conservative management, or open surgery, are indicated. Reduced acoustic noise, lighter receiver coils, and wider scan bores may improve procedural tolerance.

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Section: Discussionmentioning

confidence: 96%

Patient Perception of Lower Limb Non-Contrast Magnetic Resonance Angiography and Digital Subtraction Angiography in Diabetic Patients with Peripheral Arterial Disease

Lukies

Richmond

Hornsey

et al. 2017

Cardiovasc Imaging Asia

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“…The sounds made by the scanner vary in volume and tone with the type of pulse sequence performed. 5,19 The acoustic noise varies due to the alteration of the gradient output (rise time or amplitude) with variation of MR imaging parameters. Noise tends to be enhanced by decreases in section thickness, FOV, TR, and TE.…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…[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. 6 The primary source of acoustic noise in MR imaging procedures is the pulsed currents generated in gradient coils for spatial encoding of the MR signal.…”

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confidence: 99%

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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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“…Safety issues related to the use of MRI, such as the physiological effects of acoustic noise, radio frequency (RF) and magnetic field, were first investigated in 1987 [1]. More recent studies found that exposure to loud MRI sounds could cause psychological consequences including temporary threshold shifts, anxiety, stress, annoyance, mental fatigue and fear, as well as permanent hearing loss [2][3][4][5][6]. Hence, the present recommendation is that all patients and some healthcare workers (for those who are required to stay in or near the scanner chamber) wear ear protection during MRI scanning [7][8].…”

Section: Introductionmentioning

confidence: 99%

Simulation study on active noise control for a 4-T MRI scanner

Lim

Lee

2008

Magnetic Resonance Imaging

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The purpose of this work is to study computationally the possibility of the application of a hybrid active noise control technique for MRI acoustic noise reduction.A hybrid control system combined with both feedforward and feedback loops embedded is proposed for potential application on active MRI noise reduction. A set of computational simulation studies were performed. Sets of MRI acoustic noise emissions measured at the patient's left ear location were recorded and used in the simulation study.By comparing three different control systems, namely the feedback, the feedforward and the hybrid control, our results revealed that the hybrid control system is the most effective. The hybrid control system achieved approximately a 20 dB reduction at the principal frequency component.We concluded that the proposed hybrid active control scheme could have a potential application for MRI scanner noise reduction.

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Auditory Noise Associated With MR Procedures: A Review

Cited by 183 publications

References 30 publications

Patient Perception of Lower Limb Non-Contrast Magnetic Resonance Angiography and Digital Subtraction Angiography in Diabetic Patients with Peripheral Arterial Disease

Patient Perception of Lower Limb Non-Contrast Magnetic Resonance Angiography and Digital Subtraction Angiography in Diabetic Patients with Peripheral Arterial Disease

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

Simulation study on active noise control for a 4-T MRI scanner

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