Accurate quantitative evaluation of MRI scanning noise based on laser vibrometry technology
10.19745/j.1003-8868.2024188
- VernacularTitle:基于激光测振技术的MRI扫描噪声精准量化评价研究
- Author:
Ke-Sheng WANG
1
;
Pei-Jia XU
;
Pei LIU
;
Jing-Sheng SUN
;
Ze-Kai LI
;
Xu-Guang PENG
;
Shuang-Shuang LI
;
Qian-Hong HE
;
Zhen LIU
Author Information
1. 电子科技大学,成都 611731
- Keywords:
laser vibrometry;
MRI scanning;
noise evaluation;
vibration velocity method;
mute sequence
- From:
Chinese Medical Equipment Journal
2024;45(10):20-24
- CountryChina
- Language:Chinese
-
Abstract:
Objective To carry out accurate quantative evaluation of MRI scanning noise based on laser vibrometry technology.Methods Skull and spine MRI was performed with mute and conventional sequences.A laser vibrometry device was used to sample the surface vibration noise at the outer edge of the inspection hole of MRI system according to GB/T 16539-1996 Acoustics—Determination of sound power levels of noise sources using vibration velocity—Measurement for seal machinery,and the indicators of sound power level,sound pressure level and perceived noise level obtained by the three calculation methods(LPN1,LPN2 and LPN3)were analyzed with some dedicated MRI noise analysis software.Results The peak sound pressure levels for conventional and mute sequences of skull scanning were 81 and 63 dB(A),respectively,and mute sequence reduced the noise level significantly;the peak sound pressure levels for conventional and mute sequences of spine scanning were 79 and 75 dB(A),respectively,and the noise reduction level was significantly lower than that of skull scanning.Significant differences in noise reduction were not found in spine scanning sequences,while were found in skull scanning sequences.During spine and skull scanning LPN1,LPN2 and LPN3 obtained by the three calculation methods of conventional and mute sequences were all higher than the overall sound power and overall pressure levels obviously.Conclusion Mute sequence can not realize linear noise reduction for the whole frequency band,the perceived noise of the human ear during MRI scanning is related directly to the scanning sequence,and there may be some bias when only one physical indicator is involved in the noise evaluation of MRI system.[Chinese Medical Equipment Journal,2024,45(10):20-24]
