Influence of thermoacoustic effect for frequency of magnetoacoustic signals
10.7687/j.issn1003-8868.2018.01.041
- VernacularTitle:热声效应对磁声信号的频率影响分析
- Author:
Xiao-Qing ZHOU
1
;
Shi-Kun LIU
;
Xin-Shan ZHANG
;
Tao YIN
;
Zhi-Peng LIU
Author Information
1. 中国医学科学院北京协和医学院生物医学工程研究所
- Keywords:
thermoacoustic effect;
magnetoacoustic signal;
thermoacoustic signal;
magnetoacoustic imaging;
frequency
- From:
Chinese Medical Equipment Journal
2018;39(1):41-45
- CountryChina
- Language:Chinese
-
Abstract:
Objective To research the influence of the thermoacoustic effect for the frequency of the magnetoacoustic signals in the magnetoacoustic tomography (MAT).Methods Some experiments were designed,and the magnetoacoustic signals and the thermoacoustic signals of several materials with different conductivities were analyzed and compared in the time domain and the frequency domain respectively,of which,copper and graphite were high-conductivity materials,and agar and pork were used as low-conductivity biological or similar tissue.Results The characteristics of the magnetoacoustic signals and the thermoacoustic signals of different materials were acquired.The results illustrated that there was a little drop in frequencies of acoustic signals of the materials with high conductivities while a big drop in frequencies of signals of the tissue-like materials comparing with the stimulant pulse.Furthermore,the main frequencies of acoustic signals were not accordant but much lower than the stimulant ones. Conclusion It is found that the thermoacoustic effect is related to the frequency of the acoustic signals. The drop in the center frequencies of the acoustic signals could be explained by the thermoacoustic effect of materials.The acoustic signals with lower main frequencies have the higher proportion of thermoacoustic signals.The studies could contributing to optimizing MAT method and improving MAT imaging quality.
