PULSED CAVITATIONAL ULTRASOUND THERAPY WITH SHEAR WAVE ELASTOGRAPHY FEEDBACK

摘要

Methods and devices for imaging tissue elasticity change as a tool to provide feedback for histotripsy treatments. Tissue lesion elasticity was measured with ultrasound shear wave elastography, where a quasi-planar shear wave was induced by acoustic radiation force generated by the therapeutic array, and tracked with ultrasound imaging at 3000 frames per second. Based on the shear wave velocity calculated from the sequentially captured frames, the Young's modulus in the lesion area was reconstructed. Results showed that the lesions were clearly identified on the elasticity images as an area with decreased elasticity. Lesions produced by histotripsy can be detected with high sensitivity using shear wave elastography. Decrease in the tissue elasticity corresponds well with the morphological and histological change.