CN105640591A - Transcranial Doppler equipment - Google Patents
Transcranial Doppler equipment Download PDFInfo
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- CN105640591A CN105640591A CN201610166454.5A CN201610166454A CN105640591A CN 105640591 A CN105640591 A CN 105640591A CN 201610166454 A CN201610166454 A CN 201610166454A CN 105640591 A CN105640591 A CN 105640591A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/42—Details of probe positioning or probe attachment to the patient
- A61B8/4245—Details of probe positioning or probe attachment to the patient involving determining the position of the probe, e.g. with respect to an external reference frame or to the patient
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/48—Diagnostic techniques
- A61B8/488—Diagnostic techniques involving Doppler signals
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/52—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/5215—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of medical diagnostic data
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Abstract
The invention provides transcranial Doppler equipment which comprises probes, a probe seat, a probe recognition device and a signal processing component, wherein the probe seat is used for accommodating different probes; the probes have different central frequencies; the probe recognition device is used for confirming the central frequencies of probes accommodated in the probe seat and providing the central frequencies to the signal processing component; the signal processing component is used for providing transmitting signals of corresponding frequencies to the probes according to the central frequencies, and used for processing received signals so as to obtain Doppler signals; the probes are adopted for electro-acoustic conversion of the transmitting signals so as to transmit ultrasonic waves, and used for receiving reflected ultrasonic waves and carrying out acoustic-electro conversion so as to generate receiving signals. The transcranial Doppler equipment can support different probes with respective central frequencies, a user can select a most appropriate central frequency according to a practical application situation, an optimal spectrogram effect can be achieved, and the user experience is remarkably improved.
Description
Technical field
The present invention relates to medical instruments field, specifically, it relates to a kind of transcranial Doppler equipment.
Background technology
Doppler effect refers to that the wavelength of the ripple of object radiation changes due to the relative movement of this object and observation person. Before the wave source of motion, ripple is compressed, and wavelength becomes shorter, and frequency becomes higher; Time after the wave source moved, contrary phenomenon occurring, wavelength becomes longer, and frequency becomes lower. The movement velocity of wave source is more high, and the Doppler effect produced is more remarkable. Therefore, the degree changed according to wave frequency, it is possible to calculate the speed that wave source follows observed ray motion.
Doppler's supersonic blood analysis is a kind of method utilizing Doppler effect, being evaluated different physiologic character by the inspection of Noninvasive. Transcranial Doppler equipment is the ultrasonic device of a kind of customization, is specifically designed to the ultrasonic examination through skull. Wafer in transcranial Doppler equipment use external supersonic probe launches ultrasonic wave (abbreviation transmitted wave) through the gap of skull or " window " to the cerebrovascular, the existence of blood flow will cause the generation of Doppler effect (Doppler shift frequency), last ultrasonic wave is reflected back to probe (abbreviation echo), receive through same wafer, carry out data processing by analyser and draw corresponding blood flow information. Owing to adopting degree of depth gating (or distance gating) technology, fixed point measuring of blood flow can be carried out, thus there is very high resolution in range, it is possible to the character of certain some blood flow be made and analyzes accurately. Specifically, if a certain detection degree of depth does not exist blood flow, so not producing Doppler effect, compared with transmitted wave, the mid-frequency of echo can not change; And if a certain detection degree of depth exists blood flow, then producing Doppler effect, compared with transmitted wave, the mid-frequency of echo can offset. If mid-frequency is filtered, only retain Doppler shift composition, then for the degree of depth that there is not blood flow, by only remaining ambient noise signal (useless signal) in spectrum signal, and for there is the degree of depth of blood flow, spectrum signal will comprise Doppler signal (useful signal) and useless signal.
Transcranial Doppler equipment, for diagnosing cerebrovascular disease, helps to check that the cerebrovascular narrows, blocks, the state of an illness such as thrombosis or Intracerebral hemorrhage. Application doppler's spectrum analysis technique, blood flow waveform can be provided for clinical diagnosis, the information such as band width under blood flow rate (top speed, V-bar etc.), blood flow disorder and turbulent state, volume of blood flow, this is very important for the early discovery of cerebrovascular disease.
In the use of transcranial Doppler equipment, the mid-frequency launching signal is an important indicator. The mid-frequency launching signal is more high, and spectrogram is more fine and smooth, and low speed signal resolving power is more good; Mid-frequency is more low, and velocity measurement scope is more big, and penetration power is more good. In Clinical practice, for low speed blood flow, it is desirable to use higher mid-frequency, to obtain the higher image of resolving power; For patient's (difficulty penetrates) of high speed blood flow or detection difficult, it is desirable to use lower mid-frequency, ensure basic picture quality. And existing transcranial Doppler equipment can only support the transmitting signal of certain specific frequency, and then a kind of probe corresponding to frequency specific for this can only be configured with, cannot meet consumers' demand.
Summary of the invention
In order to solve problems of the prior art at least in part, according to an aspect of the present invention, it provides a kind of transcranial Doppler equipment, comprising: probe, probe seat, probe distinguishing device and signal processing component, wherein,
Described probe seat is for holding different probes, and the difference between described different probe is that mid-frequency is different;
Described probe distinguishing device is for determining the mid-frequency of the probe that described probe seat holds and provides described mid-frequency for described signal processing component;
Described signal processing component is used for providing the transmitting signal of corresponding frequencies to described probe according to described mid-frequency, and for carrying out signal processing to received signal to obtain Doppler signal;
Described probe is used for that described transmitting signal carries out electricity-sound to be changed to launch ultrasonic wave, and for the ultrasonic wave after receiving reflection and carry out sound-electric conversion to generate described Received signal strength.
Can selection of land, described probe seat is multiple,
Described signal processing component comprises take-off equipment and input unit,
Described take-off equipment is for exporting described mid-frequency;
Described input unit selects the instruction of required probe for receiving according to described mid-frequency from the probe that described probe seat holds;
Wherein, the frequency of described transmitting signal is corresponding with the mid-frequency of described required probe.
Can selection of land, described signal processing component comprises the signal generating module narrow band filter corresponding to the frequency of described transmitting signal and multi-path choice device further, wherein,
Described signal generating module is used for providing the transmitting signal of described corresponding frequencies to described probe according to described mid-frequency and provides turn-on command to described multi-path choice device for the frequency according to described transmitting signal;
Described narrow band filter for described transmitting signal is carried out filtering, with provide described transmitting signal to described probe before remove humorous wave component wherein; And
Described multi-path choice device is used for selecting the narrow band filter conducting corresponding to the frequency of described transmitting signal according to described turn-on command.
Can selection of land, described signal generating module comprises further:
Clock unit, for generating clocksignal; And
Signal processing device, for carrying out down-sampled according to described mid-frequency to described clocksignal, to obtain described transmitting signal.
Can selection of land, described signal processing component comprises further:
Modulus sampling module, for carrying out analog to digital conversion to described Received signal strength, to generate numerary signal;And
Signal processing device, for modulating described transmitting signal, and for described numerary signal is carried out demodulation before described transmitting signal is supplied to described probe.
Can selection of land, described signal processing component comprises further:
Signal processing device, for modulating described transmitting signal before described transmitting signal is supplied to described probe;
Modulus sampling module, for carrying out analog to digital conversion to described Received signal strength, to generate numerary signal; And
Upper computer, for carrying out demodulation to described numerary signal.
Can selection of land, described signal processing component comprises the broadband filter being connected between described modulus sampling module and described probe seat further, for described Received signal strength is carried out filtering.
Can selection of land, described probe comprises signal launching device, for sending probe recognition signal;
Described probe distinguishing device comprises receiver module further, identifies module and sending module,
Described receiver module is for receiving described probe recognition signal;
Described identification module is used for the center frequency information of probe according to described probe recognition signal identification;
Described sending module is used for the center frequency information of the described probe identified is sent to described signal processing component.
Above-mentioned transcranial Doppler equipment can support the different probes with respective mid-frequency, it is possible to use optimum mid-frequency, according to practical situations, is selected in family, reaches best spectrogram effect, significantly improves Consumer's Experience.
Introducing the concept of a series of simplification in summary of the invention, these concepts will further describe in embodiment part. Content part of the present invention does not also mean that the key feature and essential features that to be attempted the claimed technical scheme of restriction, does not more mean that the protection domain attempting to determine claimed technical scheme.
Below in conjunction with accompanying drawing, advantages and features of the invention are described in detail.
Accompanying drawing explanation
The following accompanying drawing of the present invention in this as the part of the present invention for understanding the present invention. Shown in the drawings of embodiments of the present invention and description thereof, it is used for explaining the principle of the present invention. In the accompanying drawings,
Fig. 1 shows the schematic block diagram of transcranial Doppler equipment according to an embodiment of the invention;
Fig. 2 shows the frequency-sensitivity curve schematic diagram of broadband probe and arrowband probe according to an embodiment of the invention; And
Fig. 3 shows the schematic block diagram of transcranial Doppler equipment in accordance with another embodiment of the present invention;
Fig. 4 shows the filter effect schematic diagram of narrow band filter according to an embodiment of the invention; And
Fig. 5 respectively illustrates narrow band filter according to an embodiment of the invention and carries out the signal waveforms before and after filtering.
Embodiment
In the following description, it provides a large amount of details is the present invention can thoroughly be understood. But, those skilled in the art are it can be appreciated that following description only relates to the better embodiment of the present invention, and the present invention can be implemented without the need to one or more such details. In addition, in order to avoid obscuring with the present invention, technology features more well known in the art are not described.
The present invention provides a kind of transcranial Doppler equipment. Fig. 1 shows the schematic block diagram of transcranial Doppler equipment 100 according to an embodiment of the invention. As shown in Figure 1, this transcranial Doppler equipment 100 comprises probe, probe seat 120, probe distinguishing device 130 and signal processing component 140.The main frame that can be positioned at this transcranial Doppler equipment 100 at least partially of probe distinguishing device 130 and signal processing component 140.
Probe is used for transmittings signal carrying out electricity-sound conversion to launch ultrasonic wave, and for the ultrasonic wave after receiving reflection and carry out sound-electric conversion to generate Received signal strength. Specifically, probe can receive the transmitting signal from signal processing component 140 via probe seat 120. This transmitting signal can represent the one-dimensional signal for changing in time. Transmitting signal is carried out electricity-sound conversion by probe, to launch ultrasonic wave. Launch ultrasonic wave to be equivalent to carry out on a timeline once sampling every time. Ultrasonic wave is sent in tissue and bone, and part energy can return probe. Probe can also receive the ultrasonic wave after measured is reflected, and carries out sound-electric conversion, the echo comprising velocity of sound information is changed into electrical signal, to generate Received signal strength.
Transcranial Doppler equipment 100 can support multiple different probe. The different key distinctions between probe is mainly that mid-frequency is different. It can be appreciated that different probe its frequency bandwidth of possibility is also different. User as required, can be connected to main frame by meeting its probe required. Generally speaking, the frequency narrower bandwidth (referred to as arrowband probe) popped one's head in and support, typical case's value is 20% fractional bandwidth. Bandwidth is used for identifying the band width that the signal supported occupies, and this width is determined by the most high frequency of the signal supported and minimum frequency. That is, if the mid-frequency of probe is 2.0MHz, its effective frequency scope (frequency band) is about 1.8MHz to 2.2MHz. When the frequency of the transmitting signal received of popping one's head in equals mid-frequency, probe will have optimum sensitivity and resolving power. If the frequency of transmitting signal that probe receives is 1.8MHz, the sensitivity of probe declines about 6dB, but still can use. If the frequency launching signal is 1.6MHz, the sensitivity meeting rapid decrease of probe, it is possible to lower than 20dB, cause normally using. Probe can be designed with 2 frequencies (referred to as broadband probe), such as 1.6MHz and 2.0MHz. Although such maximum sensitivity declines to some extent than the probe only with a frequency, but can take into account more range of frequency simultaneously, the transmitting signal of such as 1.6MHz, 1.8MHz and 2.0MHz all can be received by a probe. Adopt the probe with multifrequency point can reduce the use cost of transcranial Doppler equipment. Fig. 2 shows the frequency-sensitivity curve of broadband probe and arrowband probe according to an embodiment of the invention.
In transcranial Doppler equipment 100, the mid-frequency of probe 111 can be 1.6MHz, and the mid-frequency of probe 112 can be 1.8MHz, and the mid-frequency of probe 113 can be 2.0MHz, probe 114 can be a wideband probe, and its mid-frequency comprises 1.6MHz and 2.0MHz.
Probe seat 120 is for holding different probes, and probe seat 120 is the physical connection between main frame and probe. Probe seat 120 is such as arranged on main frame. Pop one's head in and it is connected to main frame by being inserted to probe seat 120. Signal processing component 140 communicates with probe via probe seat 120 with probe distinguishing device 130. In one example, transcranial Doppler equipment 100 can have multiple probe seat, as shown in Figure 1. The probe that each probe seat has particular centre frequency and/or specific bandwidth for holding. In another example, transcranial Doppler equipment 100 can only have a probe seat, the probe that this probe seat can be compatible different.In another example, transcranial Doppler equipment 100 can only have a probe seat, and it can hold the probe being designed with multiple frequency.
Probe distinguishing device 130 is connected between probe and signal processing component 140, and it is for the mid-frequency of current the held probe of seat 120 of determining to pop one's head in and provides described mid-frequency for signal processing component 140. As previously mentioned, transcranial Doppler equipment 100 can have multiple probe seat 120. Assume to have 4 probe seats, and wherein 3 are inserted with probe. So probe distinguishing device 130 identifies the mid-frequency of the probe inserted in these 3 probe seats. The mid-frequency identified also is sent to signal processing component 140 by probe distinguishing device 130.
Can selection of land, probe distinguishing device 130 also for the bandwidth of current the held probe of seat 120 of determining to pop one's head in and provide described bandwidth for signal processing component 140.
In one example, probe comprises signal launching device, and it is for sending probe recognition signal. Probe distinguishing device 130 comprises receiver module further, identifies module and sending module. Receiver module is used for receiving described probe recognition signal from probe, and probe recognition signal comprises probe identity. Identify that module is used for the information of probe according to described probe recognition signal identification, such as center frequency information, bandwidth information etc. Sending module is used for the information of the described probe identified is sent to described signal processing component 140. Initiatively send probe recognition signal by popping one's head in, avoid operating without meaning of probe distinguishing device 130, and the identification realizing popping one's head in by signal stream mode is simple.
In another example, probe comprises storing device, and it is for storing probe identifying information. Probe distinguishing device 130 may further include read module, identifies module and sending module. Read module is used for the described probe identifying information initiatively reading in the storing device of probe. Identify that module is used for the information of probe according to described probe identifying information identification, such as center frequency information, bandwidth information etc. Sending module is used for the information of the described probe identified is sent to described signal processing component 140. The identification that this kind realizes probe by signal stream mode is simple.
In another example, probe distinguishing device 130 completes the identification of probe mechanically, and the such as shape of joint portion being connected with probe seat according to probe carrys out identification probe.
Signal processing component 140 can provide the transmitting signal of different frequency. Its mid-frequency that may be used for the probe current held according to probe seat 120 provides the transmitting signal of corresponding frequencies to probe. In one example, according to the signal from probe distinguishing device 130, signal processing component 140 knows that the mid-frequency of the probe that probe seat 120 is current held is 2.0MHz, so the transmitting signal of 2.0MHz frequency will be provided to probe. Here, the frequency of the transmitting signal that signal processing component 140 provides is consistent with the mid-frequency of probe. Like this, it is possible to make the sensitivity of probe best. In another example, according to the signal from probe distinguishing device 130, signal processing component 140 knows that the mid-frequency of the probe that probe seat 120 is current held is 2.0MHz, the transmitting signal of optional frequency of about 2.0MHz so can be provided selectively to probe. Although the mid-frequency of the frequency of the transmitting signal that signal processing component 140 provides and probe is not completely the same, but it can ensure normally carrying out of measurement substantially, therefore, also thinks that it is corresponding with the mid-frequency of probe.Preferably, according to the bandwidth of probe, such as 20% fractional bandwidth, it is provided that the transmitting signal of the optional frequency between 1.8MHz to 2.2MHz gives probe. The accuracy of the more enough guarantee Doppler signals of the transmitting signal with the frequency in wide region, and then ensure the accuracy of measurement.
Signal processing component 140 is also for carrying out signal processing to obtain Doppler signal to the Received signal strength from probe. Doppler signal can be shown as three-dimensional Doppler spectrum. The blood flow information of human body directly can be obtained according to Doppler spectrum.
Above-mentioned transcranial Doppler equipment 100 can support the probe with different center frequency, the mid-frequency of the probe that its automatic identification equipment inserts, thus the equipment entirety of making is applicable to this mid-frequency, obtains the Doppler signal corresponding with this mid-frequency. Thus, this transcranial Doppler equipment 100 can improve Consumer's Experience better, meets user's needs.
As mentioned above, it is necessary, transcranial Doppler equipment 100 can be provided with multiple probe seat. In this case, transcranial Doppler equipment 100 may be connected with multiple probe simultaneously. Like this, probe distinguishing device 130 can identify this multiple probe mid-frequency separately, and all mid-frequencies are fed back to signal processing component 140. Signal processing component 140 can comprise take-off equipment and input unit. Take-off equipment is for outputing signal the mid-frequency of the probe that processing components 140 receives, so that the user of transcranial Doppler equipment knows. Can selection of land, take-off equipment can also be used for outputing signal the bandwidth of the probe that processing components 140 receives. In one example, signal processing component 140 can comprise upper computer. Indicating meter on upper computer can as take-off equipment, over the display, it is possible to the respective mid-frequency of the current all probes connected and bandwidth on display transcranial Doppler equipment 100. Such as, being currently connected to three probes, the mid-frequency of these probes is 2.0MHz, 1.8MHz and 1.6MHz respectively, and bandwidth is 20% fractional bandwidth. User can check this mid-frequency and bandwidth by indicating meter. The device such as keyboard or mouse on upper computer can as input unit. Input unit selects the instruction of required probe for receiving the mid-frequency according to probe from probe. User can select required probe directly utilize the input unit such as keyboard or mouse to input instruction to transcranial Doppler equipment according to the mid-frequency of probe and current practical situation (such as patient's situation etc.), determines required probe with in the probe that holds from probe seat. It can be appreciated that user can also according to the bandwidth of probe when selecting required probe. In one example, after input unit have received the instruction from user, signal processing component can provide the transmitting signal of the mid-frequency same frequency with this probe to this probe according to determined probe. In other words, the frequency of the transmitting signal that signal processing component provides is identical with the mid-frequency of determined probe. Like this, ensure that the sensitivity of probe is best. In another example, signal processing component 140 can also provide the transmitting signal of the optional frequency about equaling mid-frequency to this probe according to determined probe, it is preferable that the optional frequency in the bandwidth of probe. Being such as 2.0MHz for mid-frequency, the probe of 20% fractional bandwidth, signal processing component 140 can provide the transmitting signal of the optional frequency between 1.8MHz to 2.2MHz.In one example, first signal processing component 140 can calculate the transmitting signal of the mid-frequency its frequency being equaled to probe, and whether it can measure the certain depth of expectation and the blood circumstance of specific speed. This certain depth and specific speed can be that equipment 100 is received by input unit. Of course, if so providing its frequency to equal the transmitting signal of the mid-frequency popped one's head in. If cannot, so provide its frequency lower than the transmitting signal of mid-frequency of probe, can selection of land, the frequency of this transmitting signal is still in the bandwidth of probe.
Being the wideband in the case of of popping one's head in for popping one's head in, its multiple mid-frequency can be all sent to signal processing component 140 by probe distinguishing device 130. If first signal processing component 140 can calculate the transmitting signal providing its frequency to equal to pop one's head in higher mid-frequency to probe, so can equipment 100 measure the certain depth of expectation and the blood circumstance of specific speed. Such as, mid-frequency described above being comprised to the wideband probe of 1.6MHz and 2.0MHz, first can signal processing component 140 can calculate the transmitting signal that frequency is 2.0MHz and satisfy the demands. If the transmitting signal of this frequency is for equipment 100, the certain depth of expectation and the measuring result of specific speed can be provided, so the transmitting signal of corresponding frequencies can be provided to this probe according to the higher mid-frequency (such as 2.0MHz) of probe. If the transmitting signal of this frequency is for equipment 100, the certain depth of expectation and the measuring result of specific speed cannot be provided, so the transmitting signal of corresponding frequencies can be provided to this probe according to its lower mid-frequency (such as 1.6MHz).
One of ordinary skill in the art will appreciate that, input, the take-off equipments such as indicating meter as described herein, keyboard and mouse are only example, and unrestricted. Such as, input, take-off equipment can also be the mobile terminals of the part as signal processing component 140, and it by wired or wireless network reception and/or the information of transmission, thus can be used as input and/or input unit.
Fig. 3 shows the schematic block diagram of transcranial Doppler equipment 300 according to another embodiment of the present invention. Transcranial Doppler equipment 300 shown in Fig. 3 is substantially identical with the transcranial Doppler equipment 100 shown in Fig. 1 except signal processing component 340, therefore, will omit the description to same or similar parts herein for simplicity. And, in any embodiment that this signal processing component 340 can be applied to above and hereafter mention.
Signal processing component 340 comprises the signal generating module narrow band filter corresponding from different frequency and multi-path choice device further.
This signal generating module is used for the mid-frequency according to probe provides the transmitting signal of corresponding frequencies to probe. When equipment 300 is only connected with a probe, it is provided that the transmitting signal of frequency corresponding with the mid-frequency of this probe is to this probe. When equipment 300 is connected with multiple probe, it is provided that give this determined probe with the transmitting signal of the corresponding frequency of mid-frequency of current determined probe.
In addition, this signal generating module also for providing turn-on command to multi-path choice device according to the frequency launching signal. Multi-path choice device is used for selecting the narrow band filter conducting corresponding to the frequency of described reflected signal according to described turn-on command.
Having illustrated 4 narrow band filters in Fig. 3, it will be understood that the number of narrow band filter can according to circumstances adjust, number here 4 is only example and unrestricted.Each narrow band filter is used for the transmitting signal to corresponding frequencies and carries out filtering, to remove humorous wave component wherein by launching before signal is supplied to probe. In other words, each narrow band filter is corresponding from the frequency of different transmitting signals. Except comprising base wave component in transmitting signal, also comprise humorous wave component. These humorous wave components, outside the frequency band range of probe, can not be used effectively, can only be converted into heat energy. Narrow band filter can filter the humorous wave component launched in signal, so that drive probe closer to the transmitting signal of positive string signal. Fig. 4 shows the filter effect schematic diagram of narrow band filter according to an embodiment of the invention. The frequency of its transverse axis expression signal, the intensity of longitudinal axis expression signal. As shown in Figure 4, narrow band filter can effective filtering harmonic wave, but retain the base ripple of corresponding frequencies. Fig. 5 respectively illustrates narrow band filter according to an embodiment of the invention and carries out the signal waveforms before and after filtering. Oscillogram above wherein is the signal waveforms before narrow band filter filtering. Oscillogram below is the filtered signal waveforms of narrow band filter. As shown in Figure 5, adopt the mode of first filtering rear drive probe, it is converted into close to pure sinusoid signal to the transmitting signal of probe to be supplied, makes the energy being applied on probe be converted into ultrasonic signal as far as possible, effectively reduce probe abnormal heating. Each frequency is all designed with independent wave filter so that harmonic wave, lower than 40dB, ensure that filter effect is best.
Can selection of land, above-mentioned signal generating module comprises clock unit and signal processing device further. Clock unit is for generating clocksignal. Signal processing device is used for the mid-frequency according to probe and carries out down-sampled to described clocksignal, to obtain described transmitting signal. Signal processing device can realize with digital signal processor (DSP). In one example, clock unit can be quartz crystal oscillator. It is clock based on the square wave signal of 80MHz that clock unit can produce frequency. If the down-sampled rate of signal processing device is 40, it is possible to obtain the transmitting signal that frequency is 2MHz; If the down-sampled rate of signal processing device is 44, it is possible to obtain the transmitting signal that frequency is 1.8MHz; If the down-sampled rate of signal processing device is 50, it is possible to obtain the transmitting signal that frequency is 1.6MHz.
The mode adopting the clocksignal produced by clock unit down-sampled obtains transmitting signal and realizes simple, practical. Coordinate with the narrow band filter after signal generating module, it is possible to obtain almost ideal transmitting signal.
As shown in Figure 3, signal processing component 340 can further include modulus sampling module (AD). Received signal strength from probe can be carried out analog to digital conversion by modulus sampling module, to generate numerary signal. Modulus sampling module by with sample frequency to analog signal sampling, be changed into numerary signal.
In one example, the signal processing device in signal processing component 340 can also be used for modulating described transmitting signal before described transmitting signal is supplied to probe, and the described numerary signal from modulus sampling module is carried out demodulation. Signal processing device described here can realize by DSP by mentioned earlier. The demodulation utilizing this signal processing device to realize launching the modulation of signal and numerary signal can effectively utilize the powerful signal processing ability of DSP, reduces the cost of equipment 300.
In another example, as illustrated when the equipment 100 of description, signal processing component 340 can also comprise upper computer, is Personal Computer (PC) shown in Fig. 3.In this example, the signal processing device in signal processing component 340 only for modulating described transmitting signal before described transmitting signal is supplied to probe. But, any signal processing is not done for the Received signal strength from probe. Aforementioned upper computer is for carrying out demodulation to the numerary signal changed through modulus sampling module. High-performance CPU in upper computer can meet real-time calculation requirement. General serial bus (USB) or high speed peripheral component interlinkage (PCIE) interface between upper computer and signal processing device can meet data transfer demands. The process adopting upper computer to carry out Received signal strength can effectively improve stabilization of equipment performance.
In above-mentioned two examples, first modulus sampling, the demodulation of rear numeral, this takes full advantage of signal digitizing technology, it is possible to reduce costs, and ensures the consistence that detected result is absolute, it is to increase equipment dependability.
As shown in Figure 3, signal processing component 340 may further include the broadband filter being connected between described modulus sampling module and described probe seat, for described Received signal strength is carried out filtering. The bandwidth of broadband filter is such as 1��2.5MHz, to cover conventional frequency. Adopt a broadband filter to carry out filtering to received signal, while ensure that filter effect, reduce the cost of equipment.
The Received signal strength generated through sound-electric conversion of popping one's head in is usually comparatively faint. Can selection of land, as shown in Figure 3, signal processing component 340 can also comprise front-end amplifier, and it is for being converted into stronger electrical signal by faint Received signal strength. Front-end amplifier ensure that the visuality of equipment Inspection result.
Can selection of land, signal processing component 340 can also comprise transmitting driving mechanism, its for by be supplied give probe transmitting signal be converted to high-voltage signal, more effectively to drive probe. In one example, the transmitting signal giving probe to be supplied is 2V, and launching driving mechanism is 20V by its voltage transitions.
Transcranial Doppler equipment is illustrated by the present invention by above-described embodiment, it should be understood that, above-described embodiment is just for the object illustrated and illustrate, and is not intended to the present invention be limited in described scope of embodiments. In addition it will be understood by those skilled in the art that, the present invention is not limited to above-described embodiment, can also make more kinds of variants and modifications according to the teachings of the present invention, within these variants and modifications all drop on the claimed scope of the present invention. Protection scope of the present invention is defined by the appended claims and equivalent scope thereof.
Claims (8)
1. a transcranial Doppler equipment, comprises probe, probe seat, probe distinguishing device and signal processing component, wherein,
Described probe seat is for holding different probes, and the difference between described different probe is that mid-frequency is different;
Described probe distinguishing device is for determining the mid-frequency of the probe that described probe seat holds and provides described mid-frequency for described signal processing component;
Described signal processing component is used for providing the transmitting signal of corresponding frequencies to described probe according to described mid-frequency, and for carrying out signal processing to received signal to obtain Doppler signal;
Described probe is used for that described transmitting signal carries out electricity-sound to be changed to launch ultrasonic wave, and for the ultrasonic wave after receiving reflection and carry out sound-electric conversion to generate described Received signal strength.
2. transcranial Doppler equipment according to claim 1, it is characterised in that, described probe seat is multiple,
Described signal processing component comprises take-off equipment and input unit,
Described take-off equipment is for exporting described mid-frequency;
Described input unit selects the instruction of required probe for receiving according to described mid-frequency from the probe that described probe seat holds;
Wherein, the frequency of described transmitting signal is corresponding with the mid-frequency of described required probe.
3. transcranial Doppler equipment according to claim 1 and 2, it is characterised in that, described signal processing component comprises the signal generating module narrow band filter corresponding to the frequency of described transmitting signal and multi-path choice device further, wherein,
Described signal generating module is used for providing the transmitting signal of described corresponding frequencies to described probe according to described mid-frequency and provides turn-on command to described multi-path choice device for the frequency according to described transmitting signal;
Described narrow band filter for described transmitting signal is carried out filtering, with provide described transmitting signal to described probe before remove humorous wave component wherein; And
Described multi-path choice device is used for selecting the narrow band filter conducting corresponding to the frequency of described transmitting signal according to described turn-on command.
4. transcranial Doppler equipment according to claim 3, it is characterised in that, described signal generating module comprises further:
Clock unit, for generating clocksignal; And
Signal processing device, for carrying out down-sampled according to described mid-frequency to described clocksignal, to obtain described transmitting signal.
5. transcranial Doppler equipment according to claim 1, it is characterised in that, described signal processing component comprises further:
Modulus sampling module, for carrying out analog to digital conversion to described Received signal strength, to generate numerary signal; And
Signal processing device, for modulating described transmitting signal, and for described numerary signal is carried out demodulation before described transmitting signal is supplied to described probe.
6. transcranial Doppler equipment according to claim 1, it is characterised in that, described signal processing component comprises further:
Signal processing device, for modulating described transmitting signal before described transmitting signal is supplied to described probe;
Modulus sampling module, for carrying out analog to digital conversion to described Received signal strength, to generate numerary signal; And
Upper computer, for carrying out demodulation to described numerary signal.
7. transcranial Doppler equipment according to claim 5 or 6, it is characterised in that, described signal processing component comprises the broadband filter being connected between described modulus sampling module and described probe seat further, for described Received signal strength is carried out filtering.
8. transcranial Doppler equipment according to claim 1 and 2, it is characterised in that,
Described probe comprises signal launching device, for sending probe recognition signal;
Described probe distinguishing device comprises receiver module further, identifies module and sending module,
Described receiver module is for receiving described probe recognition signal;
Described identification module is used for the center frequency information of probe according to described probe recognition signal identification;
Described sending module is used for the center frequency information of the described probe identified is sent to described signal processing component.
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| CN201610166454.5A CN105640591A (en) | 2016-03-22 | 2016-03-22 | Transcranial Doppler equipment |
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