Quiet FLAIR at 7T MRI.

Investigative Radiology
Julie RöschDavid M Grodzki

Abstract

The aim of this study was to investigate acoustic noise reduction and image quality of cranial magnetic resonance imaging (MRI) at 7T MRI with and without sequence-based acoustic noise reduction. Fifteen patients and 5 healthy volunteers underwent 7T MRI scanning. A fluid-attenuated inversion recovery (FLAIR) sequence was acquired with and without sequence-based acoustic noise reduction. The acoustic noise generated by each sequence was measured. Quantitative and qualitative assessments regarding signal-to-noise ratio, contrast-to-noise ratio, lesion conspicuity, level of artifacts, and overall image quality were performed. Furthermore, detection rates of white matter lesions were evaluated by 2 observers for both sequences. Acoustic noise was significantly reduced from initially 92.7 dB(A) to 78.9 dB(A), corresponding to an 80% reduction in sound pressure. The visual assessment revealed no significant difference in the level of artifacts. Although rated very high by both readers, lesion conspicuity and image quality averaged better for the regular FLAIR sequence. Signal-to-noise ratio and contrast-to-noise ratio slightly decreased when applying the sequence-based acoustic noise reduction. No significant difference was found be...Continue Reading

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Citations

Feb 11, 2021·Journal of Magnetic Resonance Imaging : JMRI·Anton GlansLenita Lindgren
Jun 4, 2021·Progress in Nuclear Magnetic Resonance Spectroscopy·Emil LjungbergFlorian Wiesinger
Jul 30, 2021·Journal of Magnetic Resonance Imaging : JMRI·Dean DarnellAllen W Song

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