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Frequency-modulated magneto-acoustic detection and imaging

Frequency-modulated magneto-acoustic detection and imaging

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Magneto-acoustic (MA) tomography combines near-field RF and ultrasound for the goal of a safe, high-resolution, high-contrast bimodal imaging technique. Coherency between RF excitation and the resulting ultrasound generation through Lorentz force interactions is established. This allows for continuous-wave (CW) imaging techniques to replace conventional pulsed-based approaches, easing system design and improving signal-to-noise ratio (SNR) while reducing the peak-to-average excitation power ratio, for the same averaging time, sensitivity and gain. This is the first successful demonstration of MA detection using step frequency CW (SFCW) as well as frequency-modulated CW (FMCW) approaches with up to 36 dB SNR improvement.

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      • 5. Wehner, D.R.: ‘High resolution radar’ (Artech House, Norwood, 1987).
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2014.0997
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