Background: Magneto-acoustic tomography with current injection involves using\nelectrical impedance imaging technology. To explore the potential applications\nin imaging biological tissue and enhance image quality, a new scan mode for the\ntransducer is proposed that is based on translational and circular scanning to record\nacoustic signals from sources.\nMethods: An imaging algorithm to analyze these signals is developed in respect to\nthis alternative scanning scheme. Numerical simulations and physical experiments\nwere conducted to evaluate the effectiveness of this scheme. An experiment using\na graphite sheet as a tissue-mimicking phantom medium was conducted to verify\nsimulation results. A pulsed voltage signal was applied across the sample, and acoustic\nsignals were recorded as the transducer performed stepped translational or circular\nscans. The imaging algorithm was used to obtain an acoustic-source image based on\nthe signals.\nResults: In simulations, the acoustic-source image is correlated with the conductivity\nat the sample boundaries of the sample, but image results change depending\non distance and angular aspect of the transducer. In general, as angle and distance\ndecreases, the image quality improves. Moreover, experimental data confirmed the\ncorrelation.\nConclusion: The acoustic-source images resulting from the alternative scanning\nmode has yielded the outline of a phantom medium. This scan mode enables improvements\nto be made in the sensitivity of the detecting unit and a change to a transducer\narray that would improve the efficiency and accuracy of acoustic-source images.
Loading....