Evaluation of Software-Optimized Protocols for Acoustic Noise Reduction During Brain MRI at 7 Tesla.

BACKGROUND

MR-generated acoustic noise may be particularly concerning at 7-Tesla (T) systems. Noise levels can be reduced by altering gradient output using software optimization. However, such alterations might influence image quality or prolong scan times, and these optimizations have not been well characterized.

PURPOSE

To evaluate image quality, sound pressure levels (SPLs), and perceived noise levels when using the acoustic noise reduction technique SofTone for T-weighted fast spin echo (TW FSE) and three-dimensional T-weighted turbo field echo (3D TW TFE), and to compare with conventional imaging during 7-T brain MRI.

STUDY TYPE

Prospective.

SUBJECTS

Twenty-eight volunteers underwent brain MRI, with n = 26 for image quality evaluations.

FIELD STRENGTH/SEQUENCE: Conventional and SofTone versions of TW FSE and 3D TW TFE at 7 T.

ASSESSMENT

Peak SPLs (A-weighted decibels, dBA), participant-perceived noise levels (Borg CR10-scale), qualitative image assessments by three neuroradiologists (four-graded ordinal scales), interrater reliability, and percentage agreement.

STATISTICAL TEST

Paired t-test, Wilcoxon's Signed-Rank Test, and Krippendorff's alpha; p < 0.05 were considered statistically significant.

RESULTS

SofTone significantly reduced peak SPLs: from 116.3 to 97.0 dBA on TW FSE, and from 123.7 to 101.5 dBA on 3D TW TFE. SofTone was perceived as significantly quieter than conventional scanning. TW FSE showed no significant differences in image quality assessments (p = 0.21-1.00), except one radiologist noting significantly less artifact interference with SofTone. General image quality remained acceptable for 3D TW TFE, though one radiologist scored it significantly lower with SofTone (mean scores: 3.08 vs. 3.65), and two radiologists observed significantly worse white and gray matter differentiation with SofTone (mean scores: 3.19 vs. 3.54; 2.27 vs. 2.81).

DATA CONCLUSION

SofTone can significantly reduce sound intensity and perceived noise levels while maintaining acceptable image quality with TW FSE and 3D TW TFE in brain MRI. It appears to be an effective tool for providing a safer, quieter 7-T scan environment.

EVIDENCE LEVEL

4 Technical Efficacy: Stage 5.