Abstract
BackgroundMagneto-acoustic tomography with current injection involves using electrical impedance imaging technology. To explore the potential applications in imaging biological tissue and enhance image quality, a new scan mode for the transducer is proposed that is based on translational and circular scanning to record acoustic signals from sources.MethodsAn imaging algorithm to analyze these signals is developed in respect to this alternative scanning scheme. Numerical simulations and physical experiments were conducted to evaluate the effectiveness of this scheme. An experiment using a graphite sheet as a tissue-mimicking phantom medium was conducted to verify simulation results. A pulsed voltage signal was applied across the sample, and acoustic signals were recorded as the transducer performed stepped translational or circular scans. The imaging algorithm was used to obtain an acoustic-source image based on the signals.ResultsIn simulations, the acoustic-source image is correlated with the conductivity at the sample boundaries of the sample, but image results change depending on distance and angular aspect of the transducer. In general, as angle and distance decreases, the image quality improves. Moreover, experimental data confirmed the correlation.ConclusionThe acoustic-source images resulting from the alternative scanning mode has yielded the outline of a phantom medium. This scan mode enables improvements to be made in the sensitivity of the detecting unit and a change to a transducer array that would improve the efficiency and accuracy of acoustic-source images.
Highlights
Magneto-acoustic tomography with current injection involves using electrical impedance imaging technology
To improve the sensitivity of the detected signals and to understand the processes involving the transducer array in magneto-acoustic tomography (MAT)-CI, we propose an alternative scanning scheme called the translational-circular scan (TC-scan) mode and performed simulations and experiments on a graphite model
Experimental results Using the setup for the MAT with current injection (MAT-CI) system, experiments were performed with the new scanning mode
Summary
Magneto-acoustic tomography with current injection involves using electrical impedance imaging technology. Wang et al BioMed Eng OnLine (2016) 15:10 differences in acoustic impedance of tissue, the contrast is not good for soft tissue. These imaging technologies are better for imaging structures and helping in disease diagnosis. They cannot distinguish functional changes in biological tissue. Electrical impedances of tissue and organs vary in diseased conditions [3]. Imaging approaches to obtain the electrical properties of biological tissue could be helpful in early diagnosis, and, for this reason, have attracted considerable interest in recent years
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