CN100579460C - Electropult of ultrasonic diagnosis equipment - Google Patents

Abstract

The invention discloses a transmitting device of an ultrasonic diagnostic equipment, including a transmitting control unit and a transmitting drive unit which is connected with the transmitting control unit, the transmitting control unit is used for the output of the Barker code pulse signal, the transmitting drive unit is used for amplifying the input Barker code pulse signal and the output of the high-voltage Barker code pulse signal. The transmitting device of the ultrasonic diagnostic equipment of the invention adopts the Barker code rather than the simple pulse as the incentive signal of an ultrasonic sensor, as the Barker code has the nature of an acute autocorrelation function, the higher signal-to-noise ratio is obtained and the resolution of the ultrasound image is improved; at the same time, the invention adopts the single transmission method, which also ensures the high frame rate of the ultrasound image.

Description

A kind of Electropult of ultrasonic diagnosis equipment

Technical field

The present invention relates to the ultrasonic diagnostic equipment technical field, be specifically related to a kind of Electropult of ultrasonic diagnosis equipment.

Background technology

In the ultrasonic diagnostic equipment of prior art, hyperacoustic emission generally is to adopt high-tension pulse to bring the excitation piezoelectric element, thereby the ultrasound wave that produces certain frequency enters human body, utilize the discontinuity of inside of human body acoustic resistance, the acoustic wave energy that reflects is received by pick off, be delivered to each receive path of system then respectively.These receive paths at first amplify the signal from pick off, and then they digitizeds, and then, extract two-dimentional organizational information and blood flow doppler information by a series of processing such as wave beam synthesize.

As shown in Figure 1, the electron focusing of acoustic beam is to realize by the electronic delay of control transceiver channel, if the time-delay indifference of passage, the focus of launching acoustic beam so at infinity.Suitably arrange the emission delay of each passage, then can allow the focus of emission acoustic beam appear at the position of hope.In the ultrasonic diagnostic imaging device of prior art, the general dynamic transmit focusing method that adopts, the signal of one frame ultrasonoscopy derives from the echo-signal combination of repeatedly emission, and the focus of each emission all is on the position of scanning pattern different depth, thereby realizes the higher image resolution ratio of the whole audience.But repeatedly emission can cause picture frame frequency to reduce at double.

Simultaneously, two kinds of forms are generally taked in the pulse of prior art Electropult of ultrasonic diagnosis equipment emission, and a kind of is unipolar pulse, and another kind is bipolar pulse.Unipolar pulse is easy to control, but harmonic component is big, and the signal to noise ratio of signal is lower, so the resolution of ultrasonoscopy is also lower; The bipolar pulse signal to noise ratio is higher relatively, but positive and negative two groups of high voltage power supplies need be provided, and has increased circuit complexity and cost.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of Electropult of ultrasonic diagnosis equipment, the Electropult of ultrasonic diagnosis equipment that overcomes prior art is repeatedly launched unipolar pulse when forming a frame ultrasonoscopy, ultrasonoscopy frame frequency and all lower defective of ultrasonoscopy resolution, and repeatedly launch bipolar pulse when forming a frame ultrasonoscopy, the defective that the ultrasonoscopy frame frequency is low and circuit is complicated.

The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:

A kind of Electropult of ultrasonic diagnosis equipment, comprise emission controlling unit and coupled emission driver element, described emission controlling unit is used to export the Barker code pulse signal, described emission driver element is used for the Barker code pulse signal of input is amplified, output high pressure Barker code pulse signal.

Described a kind of Electropult of ultrasonic diagnosis equipment, wherein said Barker code pulse signal are made as 2,3,4,5,7,11 or 13 s' Barker code pulse signal.

Described Electropult of ultrasonic diagnosis equipment, wherein said emission controlling unit comprises enumerator and shift register group, described enumerator links to each other with described shift register group, described enumerator is used for receiving selection signal Sel, determine count number and output and the described count number control signal that is shifted accordingly according to described selection signal Sel, described shift register group is used to store different Barker codes, receive described selection signal Sel, determine corresponding shift register according to described selection signal Sel, according to the corresponding Barker code of described displacement control signal displacement output.

Described Electropult of ultrasonic diagnosis equipment, wherein said emission controlling unit is made as FPGA FPGA.

Described Electropult of ultrasonic diagnosis equipment, wherein said emission driver element comprises chip MD1210 and chip TC6320, chip MD1210 links to each other with chip TC6320.

Beneficial effect of the present invention is: Electropult of ultrasonic diagnosis equipment of the present invention, adopt Barker code rather than simple pulse pumping signal as sonac, because Barker code has the character of sharp autocorrelation, thereby obtain higher signal to noise ratio, improved ultrasonoscopy resolution, owing to adopt the single emission method, also guaranteed the high frame frequency of ultrasonoscopy simultaneously.

Description of drawings

The present invention includes following accompanying drawing:

Fig. 1 is prior art emission sound beam focusing sketch map;

Fig. 2 is an Electropult of ultrasonic diagnosis equipment sketch map of the present invention;

Fig. 3 is an Electropult of ultrasonic diagnosis equipment emission controlling unit sketch map of the present invention;

Fig. 4 is 5 Barker code sketch maps of the present invention;

The sound field sketch map that Fig. 5 forms for 5 Barker code emissions of the present invention;

Fig. 6 launches driver element circuit module sketch map for the present invention.

The specific embodiment

With embodiment the present invention is described in further detail with reference to the accompanying drawings below:

As shown in Figure 2, Electropult of ultrasonic diagnosis equipment of the present invention, comprise emission controlling unit and coupled emission driver element, emission controlling unit is used to export the Barker code pulse signal, the emission driver element is used for the Barker code pulse signal of input is amplified, output high pressure Barker code pulse signal.Emission controlling unit only needs the just output of energy control level of a control signal (high level " 1 " and low level " 0 ").Control signal output by N cycle just can produce the bake sequence of N position.The emission driver element adopts unipolarity high voltage (H _VPP) and earth potential (0V) as exomonental output level.Control signal is " 1 ", then exports H _VPPControl signal is " 0 ", then exports 0V.Exomonental FREQUENCY CONTROL (promptly controlling exomonental width) also can realize by the cycle of each control signal.

As shown in Figure 3, emission controlling unit comprises enumerator and shift register group, enumerator links to each other with shift register group, enumerator receives selects signal Sel, according to selecting signal Sel to determine count number and output and the described count number control signal that is shifted accordingly, the different Barker code of storage in the shift register group receives and selects signal Sel, according to selecting signal Sel to determine corresponding shift register, according to the corresponding Barker code of displacement control signal displacement output.Wherein, EN is for enabling control signal, and CLK is a clock signal, and Sel is that 3bit Barker code figure place is selected combination, and Barker is the Barker code output signal.Table 2 has provided the sign indicating number position selection truth table when Sel is various combination.

Emission controlling unit can be realized by FPGA FPGA.

Truth table is selected in table 2 yard position

Sel	The sign indicating number position
		001	2
010	3
		011	4
100	5
		101	7
110	11
		111	13

Barker code is defined as follows: in the code character of a n position b1, b2 ..., among the bn}, each code element may value be+1 or-1 only, and its auto-correlation function satisfies:

$C_x\left(j\right)=\underset{i=1}{\overset{n-1}{\mathrm{\&Sigma;}}}{b}_i{b}_{i+j}=\left\{\begin{array}{cc}n& j=0\\ 0\mathrm{or}\&PlusMinus;1& 0<j<n\\ 0& j\&GreaterEqual;n\end{array}\right.$

Wherein j represents the displacement ordinal number of code element.The code character that satisfies such correlation function is called Barker code.Barker code is a kind of aperiodic code character, has now found n=2,3,4,5,7, and 11,13 Barker code.Barker code has sharp-pointed auto-correlation function, is convenient to distinguish mutually with stochastic signal.The Bark code character is as shown in table 1.

Table 1 Bark code character

Wherein, "+" expression value is a high level 1, and "-" expression value is a low level 0.

With five Barker codes is example, and its rule is as follows:

+++-+

Actual waveform as shown in Figure 4.Consequent sound field as shown in Figure 5, wherein, transverse axis is probe array element direction, the longitudinal axis is normalized sound field intensity, the maximum side lobe attenuation of visible five Barker codes is-14dB about.

As shown in Figure 6, the emission driver element is made of two parts: MOS drive part and MOS switch sections.The effect of MOS drive part is that the logic level transition that emission control (FPGA) unit is exported is the needed voltage of control MOS switch, and guarantees that the control signal of input MOS switch is a short pulse signal.The effect of MOS switch sections is that the conduction and cut-off by metal-oxide-semiconductor reaches the purpose that turns on and off corresponding high voltage level, thereby the high pressure transmitted pulse is provided.Wherein, the TX_EN of input and Barker signal are provided by the emission control module, and the Probe high pressure of output transmits and is connected to ultrasonic transducer.MOS driving chip and MOS switch chip are selected the MD1210 and the TC6320 of Supertex company respectively for use.TX_EN is the enable signal of MD1210, and high level " H " is effective.INA and INB are the logic control input signal, corresponding two-way output signal OUTA and OUTB.When INA is a high level " H " (3.3V) time, OUTA is low level " L ", when INA is low level " L ", OUTA be high level " H " (12V).The corresponding relation of INB, OUTB also is like this.In the circuit of the present invention, INA, INB are shorted to the Barker signal, realize that OUTA, OUTB state synchronization change.OUTA, OUTB are connected respectively to the P raceway groove of TC6320 and the grid of N raceway groove, owing to two signal conditions change synchronously, so P raceway groove and N raceway groove can only open one the tunnel under each level state.And the source electrode of two raceway grooves is linked H respectively _VppAnd GND, guarantee output signal Probe like this when the Barker signal is high level " H ", output H _VppSignal, and when the Barker signal is low level " L ", output GND signal.Thereby realized that the Barker code with logic level is converted into the high-voltage pulse sequence of same waveform.

Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations description of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.

Claims (3)

1, a kind of Electropult of ultrasonic diagnosis equipment, it is characterized in that: comprise emission controlling unit and coupled emission driver element, described emission controlling unit comprises enumerator and shift register group, described enumerator links to each other with described shift register group, described enumerator is used for receiving selection signal Sel, determine count number and output and the described count number control signal that is shifted accordingly according to described selection signal Sel, described shift register group is used to store different Barker codes, receive described selection signal Sel, determine corresponding shift register according to described selection signal Sel, according to the corresponding Barker code pulse signal of described displacement control signal displacement output, described emission driver element is used for the Barker code pulse signal of input is amplified, output high pressure Barker code pulse signal.

2, Electropult of ultrasonic diagnosis equipment according to claim 1 is characterized in that: described emission controlling unit is made as FPGA FPGA.

3, Electropult of ultrasonic diagnosis equipment according to claim 1 is characterized in that: described emission driver element comprises chip MD1210 and chip TC6320, and chip MD1210 links to each other with chip TC6320.

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