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Sofar works on ultrasonic diffraction imaging are based on scalar theory of sound wave. This is not correct as sound has vector nature. When sound propagates in fluids it can be approximated as a scalar wave as there is no polarization. But when sound propagates in solids, its vector nature has to be considered as polarization occurs and transverse wave as well as longitudinal wave will appear. Vector theory is especially needed when the obstacle size is smaller than the wavelength. We use thedoi:10.1007/978-1-4020-8823-0_53 fatcat:hzb57otombcy5panm6ujej5axu