Study of image location for the high intensity focused ultrasound therapy system.

High intensity focused ultrasound (HIFU) is one of promising non invasive thermal ablation techniques of tumor, and the demand of imaging for guidance the HIFU procedure is becoming important. We choose ultrasound imaging method based on sequence images to locate the focal position of the HIFU. To the characteristic of ultrasound sequence images, we adopt a diffusion stick method for speckle noise suppression in ultrasonic images, and improve the discrete active contour method by adding external force in segmenting sequence ultrasonic images.