Sequence-based acoustic noise reduction of clinical MRI scans

Heismann, Björn J.; Ott, Martin; Grodzki, David

doi:10.1002/mrm.25229

Cited by 46 publications

(61 citation statements)

References 18 publications

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“…The features of the methods should be considered in the selection of a method from an ever-growing range. Hardware improvement and pulse sequence development aiming at reducing sideband artifacts will have a significant impact on the use of 1 H MRS without WS [145][146][147][148].…”

Section: Discussionmentioning

confidence: 99%

Proton MRS and MRSI of the brain without water suppression

Dong

2015

Progress in Nuclear Magnetic Resonance Spectroscopy

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Section: Discussionmentioning

confidence: 99%

Proton MRS and MRSI of the brain without water suppression

Dong

2015

Progress in Nuclear Magnetic Resonance Spectroscopy

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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]. Future developments in silent MRI and quieter sequences specifically for MRA may help to minimize acoustic noise.…”

Section: Discussionmentioning

confidence: 99%

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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“…However, these sequences intrinsically yield proton-density contrast (11) and generally require relatively fast RF switching. Another strategy is to replace trapezoidal gradient waveforms during MRI with sinusoidal waveforms (13)(14)(15)(16). Those "silent" approaches effectively attenuate higher-frequency components of the acoustic noise spectrum.…”

Section: Introductionmentioning

confidence: 99%