Abstract
A new method to address the challenging tasks of image‐guidance, targeting, and treatment monitoring during HIFU treatments is presented. The approach, enabled by the use of a novel multi‐layer PZT‐PVDF array with broad receive bandwidth in conjunction with a programmable ultrasound engine, uses the passive‐mode received echoes of the imaging array with a custom pixel‐based beamforming for HIFU focal tracking and targeting, allowing real‐time two‐dimensional (2D) B‐mode visualization of the HIFU beam. Temperature monitoring during treatment is based on acoustic nonlinear propagation theory and the physical relationship of sound speed and attenuation to frequency and temperature. The harmonics‐rich received echoes are processed differentially, encoded into an RGB additive color channel, beamformed, and overlayed in color over regular B‐mode images. Dynamic local temperature changes in the region of interest become visible as the 2D color image changes from frame to frame. Preliminary results on beam visual...
Published Version
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