System study on magneto-acoustic imaging in frequency domain

VernacularTitle:频域磁声耦合成像实验系统研究
Author: Shunqi ZHANG ; Xiaoqing ZHOU ; Tao YIN ; Zhipeng LIU
Publication Type:Journal Article
Keywords: magneto-acoustic imaging; frequency domain; experiment system; lock-in amplification
From: Chinese Medical Equipment Journal 2015;36(5):1-5
CountryChina
Language:Chinese
Abstract: Objective To design a new frequency domain magnato-aoustic imaging system to image the conductivity of medium.Methods A continuous sine wave signal was adopted to stimulate the MAT signal. The lock-in technique was applied to measuring the amplitude and phase of the magneto-acoustic signal. The drive control program of the imaging system was designed using virtual instrument tools. The experiments were conducted on the phantom made of coper wire.Results The amplitude precision was improved up to 10-7 Pa, while the system could locate the sonic source with locating precision of millimeter.Conclusion A new magneto-acoustic imaging system is proposed with high locating precision as well as low frequency excitation, which is significative to the study on the sonic source theory and improvement of the imaging precision.