Abstract:
The present invention relates to an automatic frequency control module which is capable of minimizing a reflective wave of an RF power transferred to an electron accelerator by controlling an RF frequency output from an RF generator according to a resonance frequency which is changed according to external environment when the high-frequency electron accelerator is driven, and a control method thereof. An automatic frequency control module according to the present invention includes: a first band-pass filter for receiving a forward signal of an RF power supplied from an RF generator to an electron accelerator to pass frequencies within a certain range; a second band-pass filter for receiving a reverse signal reflected by the electron accelerator to pass frequencies within a certain range; a phase shifting part for compensating a phase difference of the signal passing through the first band-pass filter; a phase detecting part for measuring phases of each signal passing through the phase shifting part and the second band-pass filter; a frequency detecting part for measuring a frequency difference between two signals passing through the phase shifting part and the second band-pass filter; and a control part for selecting up or down of a resonance frequency by binarizing the values measured by the first phase detecting part, a second phase detecting part and the frequency detecting part through an algorithm, and for compensating the resonance frequency of the RF power output from the RF generator based on the selection.
Abstract:
The present invention relates to a multi-joint radiotherapy apparatus using a flexible and rotation connection waveguide. More particularly, the present invention includes a beam irradiation head unit (10); a linear acceleration means (20) that is provided in the beam irradiation head unit (10); a robot arm (30) that is connected to the beam irradiation head unit (10) and is configured to have multiple joints; a waveguide (40) that is built into the robot arm (30) and is connected to the linear acceleration means (20); and an electromagnetic wave generator (50) that is arranged below the robot arm (30) and generates electromagnetic waves so as to spread electromagnetic wave to the linear acceleration means (20) through the waveguide (40). According to the present invention, the electromagnetic wave generator is separated from the beam irradiation head unit to reduce the weight of the beam irradiation head unit and a load that is applied to the multi-joint robot arm for supporting the beam irradiation head unit is reduced so that precise operation control is available.