A Magnetic Resonance Compatible Phase Control Focused Ultrasonic Drive Circuit

Abstract

The invention relates to a magnetic resonance compatible phase-controlled focused ultrasound driving circuit. The driving circuit is connected to an ultrasound energy transducer group, and includes anFPGA output control signal module, a signal generator module group and a signal conditioning module group which are connected in order. The FPGA output control signal module receives control data ofa host computer and generates signal generator control signals and signal generator chip selection signals according to the control data. The signal generator module group outputs sine waves accordingto the signal generator control signals and the signal generator chip selection signals. The signal conditioning module group generates sinusoidal signals with a high voltage and a high current for driving the operation of transducers according to the sine waves. Compared with the prior art, the magnetic resonance compatible phase-controlled focused ultrasound driving circuit has the advantages of dependence on a physical shielding mode of a Faraday cage reducing, high integration degree, easy module expansion and the like.

Description

technical field [0001] The invention relates to a phase-controlled focused ultrasonic drive circuit, in particular to a magnetic resonance compatible phase-controlled focused ultrasonic drive circuit. Background technique [0002] Most of the existing drive circuits for phase-controlled focused ultrasound are Class D / Class E power amplifiers, which are realized by half-bridge / full-bridge circuits. It uses a square wave signal as the input signal source, and drives the ultrasonic transducer after amplification and low-pass filtering. In such an implementation, the high-order harmonic energy cannot be ignored. When working with magnetic resonance, it is necessary to use a Faraday cage with an equipotential surface to shield the emitted radio frequency noise. [0003] In applications such as magnetic resonance-guided transcranial high-intensity focused ultrasound, the Faraday cage with a large cross-sectional area affects the transmission and reception of the magnetic resonanc...

AI Technical Summary

Problems solved by technology

[0005] At the same time, due to the large difference in acoustic impedance between the tissues of the skull, the reflection caused by the reflected wave and the incident wave forms a standing wave, which poses a hazard to the brain, so a drive circuit with higher timing control accuracy is required;

Images