Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/103911
Title: Magnetically mediated thermoacoustic imaging
Authors: Feng, Xiaohua
Gao, Fei
Zheng, Yuanjin
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2014
Source: Feng, X., Gao, F., & Zheng, Y. (2014). Magnetically mediated thermoacoustic imaging. SPIE Proceedings, 8943, 894343-.
Abstract: In this paper, alternating magnetic field is explored for inducing thermoacoustic effect on dielectric objects. Termed as magnetically mediated thermo-acoustic (MMTA) effect that provides a contrast in conductivity, this approach employs magnetic resonance for delivering energy to a desired location by applying a large transient current at radio frequency below 50MHz to a compact magnetically resonant coil. The alternating magnetic field induces large electric field inside conductive objects, which then undergoes joule heating and emanates acoustic signal thermo-elastically. The magnetic mediation approach with low radio frequency can potentially provide deeper penetration than microwave radiation due to the non-magnetic nature of human body and therefore extend thermoacoustic imaging to deep laid organs. Both incoherent time domain method that applies a pulsed radio frequency current and coherent frequency domain approach that employs a linear chirp signal to modulate the envelop of the current are discussed. Owing to the coherent processing nature, the latter approach is capable of achieving much better signal to noise ratio and therefore potential for portable imaging system. Phantom experiments are carried out to demonstrate the signal generation together with some preliminary imaging results. Ex-vivo tissue studies are also investigated.
URI: https://hdl.handle.net/10356/103911
http://hdl.handle.net/10220/20035
DOI: 10.1117/12.2041870
Rights: © 2014 SPIE. This paper was published in SPIE Proceedings and is made available as an electronic reprint (preprint) with permission of SPIE. The paper can be found at the following official DOI: http://dx.doi.org/10.1117/12.2041870.  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Conference Papers

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