Patent ID: 8226559
Filing Date: 2012-07-24
Classification: A61B,A61N

Abstract:
1. A signal treatment method for an apparatus for real-time temperature measuring using a high-intensity focused ultrasound (HIFU) therapy system, comprising the steps: activating the HIFU therapy system to heat tissue; receiving a first echo signal of a reflected ultrasound wave from the heated tissue; after a predetermined period of time, receiving a second echo signal of a reflected ultrasound wave from the heated tissue; pre-filtering the echo signals to remove a first noise signal; determining a current instantaneous angular frequency of the second filtered echo signal and an initial instantaneous angular frequency of the first filtered echo signal; obtaining a phase shift signal between the first and second filtered echo signals using the change of instantaneous angular frequency between the initial instantaneous frequency of the first filtered echo signal and the current instantaneous frequency of the second filtered echo signal; post-filtering the phase shift signal to remove a second noise signal; and obtaining a temperature value by taking the first mathematical derivative of the filtered phase shift signal.