Magneto-acoustic imaging by continuous-wave excitation.
The electrical characteristics of tissue yield valuable information for early diagnosis of pathological changes. Magneto-acoustic imaging is a functional approach for imaging of electrical conductivity. This study proposes a continuous-wave magneto-acoustic imaging method. A kHz-range continuous sig...
| Published in: | Medical & Biological Engineering & Computing Vol. 55; no. 4; pp. 595 - 608 |
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| Main Authors: | , , , |
| Format: | equations & formulas research tables/charts Journal Article |
| Published: |
Springer Nature
Apr2017
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=121883620&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 121883620 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 01400118 PO0 jtl: Medical & Biological Engineering & Computing issn: 01400118 maglogo: N pubinfo: dt: Apr2017 vid: 55 iid: 4 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 121883620 121883620 NLM27370787 121883620 10.1007/s11517-016-1538-1 NLM27370787 121883620 ppf: 595 ppct: 13 formats: fmt: @attributes: type: P tig: atl: Magneto-acoustic imaging by continuous-wave excitation. aug: au: Shunqi, Zhang Zhou, Xiaoqing Tao, Yin Zhipeng, Liu affil: Institute of Biomedical Engineering , Chinese Academy of Medical Sciences and Peking Union Medical College , No. 236, Baidi Road, Nankai District Tianjin 300192 China sug: subj: Acoustics Magnetics Methods Electrophysiology Signal Processing, Computer Assisted Models, Theoretical Reproducibility of Results Equipment Design Swine Sensitivity and Specificity Sound Animal Studies Magnetics Equipment and Supplies ab: The electrical characteristics of tissue yield valuable information for early diagnosis of pathological changes. Magneto-acoustic imaging is a functional approach for imaging of electrical conductivity. This study proposes a continuous-wave magneto-acoustic imaging method. A kHz-range continuous signal with an amplitude range of several volts is used to excite the magneto-acoustic signal and improve the signal-to-noise ratio. The magneto-acoustic signal amplitude and phase are measured to locate the acoustic source via lock-in technology. An optimisation algorithm incorporating nonlinear equations is used to reconstruct the magneto-acoustic source distribution based on the measured amplitude and phase at various frequencies. Validation simulations and experiments were performed in pork samples. The experimental and simulation results agreed well. While the excitation current was reduced to 10 mA, the acoustic signal magnitude increased up to 10-7 Pa. Experimental reconstruction of the pork tissue showed that the image resolution reached mm levels when the excitation signal was in the kHz range. The signal-to-noise ratio of the detected magneto-acoustic signal was improved by more than 25 dB at 5 kHz when compared to classical 1 MHz pulse excitation. The results reported here will aid further research into magneto-acoustic generation mechanisms and internal tissue conductivity imaging. pubtype: Academic Journal doctype: equations & formulas research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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