CN201333056Y

CN201333056Y - High frequency ultrasonic coding excitation and receiving system

Info

Publication number: CN201333056Y
Application number: CN 200820143987
Authority: CN
Inventors: 周奇; 王晓春; 王延群
Original assignee: Institute of Biomedical Engineering of CAMS and PUMC
Current assignee: Institute of Biomedical Engineering of CAMS and PUMC
Priority date: 2008-12-05
Filing date: 2008-12-05
Publication date: 2009-10-28
Anticipated expiration: 2018-12-05

Abstract

The utility model belongs to ultrasonic detection technical field, in particular to a high frequency ultrasonic coding excitation and receiving system. The utility model aims to provide a high frequency ultrasonic coding excitation and receiving system which realizes low pressure emission and has high SNR. The technical proposal adopted by the utility model includes that the high frequency ultrasonic coding excitation and receiving system comprises a coding excitation emitting circuit and a receiving system; the coding excitation emitting circuit is constructed by the sequential connection of a coding FPGA, a D/A conversion chip, a preamplifier, a post-amplifier and a probe; the receiving system is constructed by the sequential connection of an echo amplifier, a pulse compression module and a comparative analysis module; the receiving system also comprises a single pulse emitter, a probe and a single pulse echo unit; the single pulse echo unit is connected with the comparative analysis module. The high frequency ultrasonic coding excitation and receiving system is mainly applicable to ultrasonic detection situations.

Description

Code-excited and the receiving system of high frequency ultrasound

Technical field

The invention belongs to the ultrasonic detection technology field, the code-excited and receiving system of particularly a kind of high frequency ultrasound.

Technical background

Ultrasonic code-excited be an advanced person's acoustic image formation technology, for the picture quality of improving diagnostic ultrasonic equipment, promote its development that important Research Significance is all arranged to aspects such as intellectuality, miniaturizations.Compare with traditional pulse echo imaging technique, ultrasonic code-excited technology can keep under the constant situation of emission peak, increase the penetration depth of average transmit power and acoustic beam, improve the signal to noise ratio and the contrast of ultrasonoscopy, reduce ultransonic cavitation effect and heat effect; Be further to realize harmonic imaging, Doppler blood flow measurement and two-dimentional GTG blood flow imaging provide the foundation, and for the diagnosis of various clinical disease important researching value are arranged all.But exist the shortcoming that high pressure is launched, signal to noise ratio is low in the prior art.

Summary of the invention

For overcoming the deficiencies in the prior art, the purpose of this utility model is: the code-excited and receiving system of high frequency ultrasound that a kind of low pressure is launched, signal to noise ratio is high is provided.

In order to achieve the above object, the technical solution adopted in the utility model is:

Code-excited and the receiving system of a kind of high frequency ultrasound comprises code-excited radiating circuit and receiving system, code-excited radiating circuit constitute successively coding FPGA, analog-digital chip, preamplifier, post-amplifier, the probe that links to each other; Receiving system constitute successively echo amplifier, pulse compression module, the relative analysis module that links to each other, receiving system also comprises pulse emitter, probe, the pulse echo device that links to each other successively, pulse echo device links to each other with the relative analysis module.

The clock end of said coding FPGA connects analog-digital chip clock end, the data wire of coding FPGA connects the analog-digital chip data wire, analog-digital chip write its clock end of control end short circuit, two outfans of analog-digital chip are connected to the homophase of preamplifier respectively by the resistance correspondence, inverting input, two outfans of analog-digital chip are separately by a ground resistance earth, preamplifier is provided with negative feedback resistor, the preamplifier in-phase input end is by its ground resistance earth, the preamplifier outfan is through the resistance of serial connection, electric capacity is connected to the in-phase input end of post-amplifier, be connected with a resistance in turn between the electric capacity of described connection post-amplifier in-phase input end and the in-phase input end of post-amplifier, an electric capacity, one end of another resistance, a resistance, an electric capacity, the other end of another resistance is distinguished ground connection separately, post-amplifier is provided with negative feedback resistor, the inverting input of post-amplifier is by its ground resistance earth, post-amplifier connects probe by its output resistance, and probe is a transducer.

This utility model possesses following technique effect:

This utility model can reduce system signal noise ratio owing to adopt coding FPGA to generate pumping signal, improves picture quality.In addition, this utility model also has characteristic of simple structure.This utility model makes full use of the electric design automation eda tool, can accelerate desin speed, improves design efficiency.Owing to adopt the signal excitation transducer after integrated operational amplifier amplifies to reduce emission voltage, can improve the safety of instrument integral body greatly, and can be good at applying in the portable set.

Description of drawings

Fig. 1 is the system global structure sketch map.

Fig. 2 is code-excited radiating circuit figure.

The specific embodiment

This utility model is at ultrasonic code-excited principle, a kind of ultrasonic code-excited circuit based on FPGA has been proposed, and by make single sided board emission experiment and human eye echo extraction experiment of the excitation of Golay sign indicating number sequence, and echo-signal is compressed this code-excited circuit of analysis explanation can reduce system signal noise ratio, improve picture quality.

Technical essential of the present utility model is:

Based on FPGA a kind of novel ultrasonic code-excited system has been proposed, on a slice FPGA, realize digitally coded real-time excitation, adopt the high speed integrated transporting discharging to simplify code-excited circuit.

2. by the thought of hardware description language Verilog HDL language moduleization and stratification, make very simple and flexible of design.

3. this code-excited system can obtain to encourage suitable even more excellent echo signal to noise ratio with the pulse of high pressure emission under the condition of the low emission voltage of 15～30V, and applications well can be arranged in portable set.

Further specify this utility model below in conjunction with the drawings and specific embodiments.

Research population structure: the design has been basic engineering with the on-site programmable gate array FPGA a kind of ultrasonic code-excited radiating circuit.Circuit adopts XC3S400FPGA to produce code-excited pairing digital coding, produce code-excited transmitted waveform through digital-to-analogue conversion, again transmitted waveform is acted on ultrasonic transducer after amplifying, and designed the echo-signal amplifying circuit and extracted echo-signal.By to echo-signal compression Treatment Analysis, illustrate that this circuit can satisfy the index request of image after the pulse compression.By comparing with the pulse echo-signal, illustrate that this code-excited circuit has the medical ultrasonic of reduction pulse emission peak acoustical power, improve advantages such as signal to noise ratio, good prospects for application is arranged.Structured flowchart as shown in Figure 1.

Physical circuit is realized

This system is made up of FPGA coding, digital-to-analogue conversion (DAC), preposition amplification, back level amplification, probe etc.Wherein FPGA produces the DAC corresponding with needing code-excited emission and changes needed different digital coded sequence.Digital-to-analogue conversion and preposition amplification all are to be used for wave beam to form, digital to analog converter is parallel DAC, the digital signal of FPGA output is connected to digital to analog converter by parallel mode, digital-to-analogue conversion becomes analog code excitation output to the digital coding sequence, and the digital to analog converter output signal is sent into preamplifier again and amplified.Preposition amplification is responsible for amplifying the code-excited signal of digital-to-analogue conversion output, and back level amplification is used for further amplifying code-excited signal makes it can directly drive probe.The FPGA that adopts in the circuit is the XC3S400 of the spartan3 series of Xilinx company, and analog-digital chip is DAC5652, and preposition amplification chip is THS4502, and it is THS3091 that the back level is amplified chip.It is the transducer of 10MHZ that probe adopts mid frequency.Circuit as shown in Figure 2.

Result of study: designed a kind of code-excited radiating circuit of low-voltage simple in structure,, can satisfy the pulse compression index after the code-excited echo that this circuit produces compresses by single face reflection experiment and living human eye test experience.This circuit has the effect that reduces ultrasonic emitting voltage, can be widely used in portable ultrasonic device.

Claims

1, the code-excited and receiving system of a kind of high frequency ultrasound, it is characterized in that, comprise code-excited radiating circuit and receiving system, code-excited radiating circuit constitute successively coding FPGA, analog-digital chip, preamplifier, post-amplifier, the probe that links to each other; Receiving system constitute successively echo amplifier, pulse compression module, the relative analysis module that links to each other, receiving system also comprises pulse emitter, probe, the pulse echo device that links to each other successively, pulse echo device links to each other with the relative analysis module.

2, code-excited and the receiving system of a kind of high frequency ultrasound according to claim 1, it is characterized in that, the clock end of said coding FPGA connects analog-digital chip clock end, the data wire of coding FPGA connects the analog-digital chip data wire, analog-digital chip write its clock end of control end short circuit, two outfans of analog-digital chip are connected to the homophase of preamplifier respectively by the resistance correspondence, inverting input, two outfans of analog-digital chip are separately by a ground resistance earth, preamplifier is provided with negative feedback resistor, the preamplifier in-phase input end is by its ground resistance earth, the preamplifier outfan is through the resistance of serial connection, electric capacity is connected to the in-phase input end of post-amplifier, be connected with a resistance in turn between the electric capacity of described connection post-amplifier in-phase input end and the in-phase input end of post-amplifier, an electric capacity, one end of another resistance, a resistance, an electric capacity, the other end of another resistance is distinguished ground connection separately, post-amplifier is provided with negative feedback resistor, the inverting input of post-amplifier is by its ground resistance earth, post-amplifier connects probe by its output resistance, and probe is a transducer.