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

Corcuera‐Solano, Idoia; Doshi, Ankur M.; Pawha, Puneet; Gui, Dorina; Gaddipati, Ajeet; Tanenbaum, Lawrence N.

doi:10.3174/ajnr.a4235

Cited by 22 publications

(26 citation statements)

References 25 publications

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“…A recent study assessed the noise level of silent and conventional PROPELLER T 2 W sequences on a clinical 1.5-T MR imaging system, similarly obtaining 26.4 dB noise reduction. 7 …”

Section: Discussionmentioning

confidence: 99%

“…Previous reports for the adult population on a 1.5-T MR imaging system showed that quiet T 2 W and T 2 FLAIR images were comparable in image quality with conventional acquisitions. 7 …”

Section: Discussionmentioning

confidence: 99%

“…Unlike previous studies of silent MRI, 5 , 7 , 16 we compared images produced using different techniques: gradient and spin-echo sequences. Taken together, the above-described factors may have emphasized the difference in contrast between the T 1 W SE and silent sequences used in this study.…”

Section: Discussionmentioning

confidence: 99%

“…T 1 -weighted (T 1 W) images are based on a three-dimensional (3D) gradient-echo imaging technique with a very short TE and an inversion preparation pulse, 5 , 6 and T 2 -weighted (T 2 W) images use 2D periodically-rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) acquisition. 7 They use radial center-out sampling scheme. 5 , 7 …”

Section: Introductionmentioning

confidence: 99%

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Comparison of Silent and Conventional MR Imaging for the Evaluation of Myelination in Children

et al. 2017

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Purpose:Silent magnetic resonance imaging (MRI) scans produce reduced acoustic noise and are considered more gentle for sedated children. The aim of this study was to compare the validity of T1- (T1W) and T2-weighted (T2W) silent sequences for myelination assessment in children with conventional spin-echo sequences.Materials and Methods:A total of 30 children (21 boys, 9 girls; age range: 1–83 months, mean age: 35.5 months, median age: 28.5 months) were examined using both silent and spin-echo sequences. Acoustic noise levels were analyzed and compared. The degree of myelination was qualitatively assessed via consensus, and T1W and T2W signal intensities were quantitatively measured by percent contrast.Results:Acoustic noise levels were significantly lower during silent sequences than during conventional sequences (P < 0.0001 for both T1W and T2W). Inter-method comparison indicated overall good to excellent agreement (T1W and T2W images, κ = 0.76 and 0.80, respectively); however, agreement was poor for cerebellar myelination on T1W images (κ = 0.14). The percent contrast of silent and conventional MRI sequences had a strong correlation (T1W, correlation coefficient [CC] = 0.76; T1W excluding the middle cerebellar peduncle, CC = 0.82; T2W, CC = 0.91).Conclusions:For brain MRI, silent sequences significantly reduced acoustic noise and provided diagnostic image quality for myelination evaluations; however, the two methods differed with respect to cerebellar delineation on T1W sequences.

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“…A recent study assessed the noise level of silent and conventional PROPELLER T 2 W sequences on a clinical 1.5-T MR imaging system, similarly obtaining 26.4 dB noise reduction. 7 …”

Section: Discussionmentioning

confidence: 99%

“…Previous reports for the adult population on a 1.5-T MR imaging system showed that quiet T 2 W and T 2 FLAIR images were comparable in image quality with conventional acquisitions. 7 …”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of Silent and Conventional MR Imaging for the Evaluation of Myelination in Children

et al. 2017

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“…They also apply a degree of gradient derating that results in longer gradient rise time (i.e., reduced slew rate) in conjunction with lower readout bandwidth, which then results in reduced readout gradient amplitudes, in turn reducing the Lorentz forces. Robust noise reduction has been demonstrated at 1.5 to 4T MRI with gradient echo (13,14,17), fast spin echo/turbo spin echo (13,14,18), and even multiecho gradient echo readouts (19). Applying the same techniques in EPI, however, has proved to be more challenging because it is louder to begin with, and because derating inevitably further reduces the phase-encoding bandwidth, aggravating the severe image distortion (20).…”

Section: Introductionmentioning

confidence: 99%

Reduced acoustic noise in diffusion tensor imaging on a compact MRI system

Tan

Hardy

Shu

et al. 2017

Magnetic Resonance in Med

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Maintaining Image Quality While Reducing Acoustic Noise and Switched Gradient Field Exposure During Lumbar MRI

Glans

Wilén

Lindgren

2021

Magnetic Resonance Imaging

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Background: MR-generated acoustic noise can contribute to patient discomfort and potentially be harmful. One way to reduce this noise is by altering the gradient output and/or waveform using software optimization. Such modifications might influence image quality and switched gradient field exposure, and different techniques appear to affect sound pressure levels (SPLs) to various degrees. Purpose: To evaluate SPLs, image quality, switched gradient field exposure, and participants' perceived noise levels during two different acoustic noise reduction (ANR) techniques, Quiet Suite (QS) and Whisper Mode (WM), and to compare them with conventional T2-weighted turbo spin echo (T2W TSE) of the lumbar spine. Design: Prospective. Subjects: Forty adults referred for lumbar MRI. Field Strength/Sequence: Conventional T2W TSE, T2W TSE with QS, and T2W TSE with WM were acquired at 1.5 T. Assessment: Peak SPL (A-weighted decibels, dBA), perceived noise levels (Borg CR10 ® -scale), signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), three radiologists' qualitative assessments in image quality on an ordinal scale 1-4, switched gradient field exposure (% general public), and gradient currents were measured. Interobserver reliability was reported as percentage agreement. Statistical Tests: Repeated measures ANOVA, Friedman's ANOVA, and Wilcoxon's Signed-Rank Test for acoustic noise measurements and image quality assessments. Results: Mean peak SPLs were 89.9 dBA, 74.3 dBA, and 78.8 dBA for conventional, QS, and WM, respectively (P < 0.05). Participants perceived QS as the quietest and conventional as the loudest sequence (P < 0.05). No qualitative differences in image quality were seen (P > 0.05), although QS showed significantly improved SNR and CNR (P < 0.05). Switched gradient field exposure was reduced by 66% and 48% for QS and WM, respectively. Data Conclusion: Without degrading image quality, both QS and WM are viable ANR techniques in lumbar T2W TSE. QS provided the lowest SPL, the lowest gradient field exposure and was perceived as the most silent among the three sequences. Level of Evidence: 1 Technical Efficacy Stage: 5

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

Cited by 22 publications

References 25 publications

Comparison of Silent and Conventional MR Imaging for the Evaluation of Myelination in Children

Comparison of Silent and Conventional MR Imaging for the Evaluation of Myelination in Children

Reduced acoustic noise in diffusion tensor imaging on a compact MRI system

Maintaining Image Quality While Reducing Acoustic Noise and Switched Gradient Field Exposure During Lumbar MRI

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