Abstract
B-scan imaging relies on geometric focusing of ultrasound echoes. In contrast, the method of Shear Wave Induced Phase Encoding imaging achieves lateral resolution of an elastic target by using traveling shear waves to encode the position of scatters in the phase of the received echo. A Fourier series description of the phase modulated echo signal is developed, demonstrating that echo harmonics at multiples of the shear wave frequency reveal target k-space data at identical multiples of the shear wavenumber. Modulation transfer functions (MTFs) are calculated for maximum shear wave acceleration and maximum shear constraints, and compared with a conventionally focused aperture. The relative SNR of this method versus a conventionally focused aperture is determined from these MTFs. Reconstructions of wire targets in a gelatin phantom using a cylindrical shear wave source are presented, including Images generated from the fundamental and second harmonic of the shear wave modulation frequency. Comparison of images generated at 1 and 3.5 MHz demonstrate the weak dependence of lateral resolution on ultrasound frequency with this method.
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