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KMID : 0357520160390010050
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Journal of Radiological Science and Technology
2016 Volume.39 No. 1 p.50 ~ p.57
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Usefulness of Acoustic Noise Reduction in Brain MRI Using Quiet-T2
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Lee Se-Jy
Kim Young-Keun
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Abstract
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Acoustic noise during magnetic resonance imaging (MRI) is the main source for patient discomfort. we report our preliminary experience with this technique in neuroimaging with regard to subjective and objective noise levels and image quality. 60 patients(29 males, 31 females, average age of 60.1) underwent routine brain MRI with 3.0 Tesla (MAGNETOM Tim Trio; Siemens, Germany) system and 12-channel head coil. Q-T2 and T2 sequence were performed. Measurement of sound pressure levels (SPL) and heart rate on Q-T2 and T2 was performed respectively. Quantitative analysis was carried out by measuring the SNR, CNR, and SIR values of Q-T2, T2 and a statistical analysis was performed using independent sample T-test. Qualitative analysis was evaluated by the eyes for the overall quality image of Q-T2 and T2. A 5-point evaluation scale was used, including excellent(5), good(4), fair(3), poor(2), and unacceptable(1). The average noise and peak noise decreased by 15dBA and 10dBA on T2 and Q-T2 test. Also, the average value of heartbeat rate was lower in Q-T2 for 120 seconds in each test, but there was no statistical significance. The quantitative analysis showed that there was no significant difference between CNR and SIR, and there was a significant difference (p<0.05) as SNR had a lower average value on Q-T2. According to the qualitative analysis, the overall quality image of 59 case T2 and Q-T2 was evaluated as excellent at 5 points, and 1 case was evaluated as good at 4 points due to a motion artifact. Q-T2 is a promising technique for acoustic noise reduction and improved patient comfort.
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KEYWORD
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Brain MRI , Acoustic Noise Reduction , MRI Noise , Quiet MRI , Quiet-T2
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