CN101467895B - Method and apparatus for realizing focusing calculation in continuous Doppler ultrasound system - Google Patents
Method and apparatus for realizing focusing calculation in continuous Doppler ultrasound system Download PDFInfo
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Abstract
The invention discloses a method for performing focalization calculation in a Doppler ultrasonic system and the method comprises steps of obtaining focal coordinates; obtaining wave length or speed of sound; calculating channel coordinates; adopting a focalization parameter calculating device shared by the channels to calculate focalization parameters of each channel according to the focal coordinates, channel coordinates and wave length or speed of sound. The invention also disclose a device for performing focalization calculation in a Doppler ultrasonic system, and the device comprises a data obtaining device for obtaining focal coordinates and wave length or speed of sound; a channel coordinate calculating device for calculating channel coordinates; a focalization parameter calculating device for connecting with the data obtaining device and the channel coordinate calculating device for calculating focalization parameters of at least two channels according to the focal coordinates, channel coordinates and wave length or speed of sound. Large numbers of computing resources can be saved by adopting the computing resources shared by channels to performing the focalization calculation, and the computational efficiency can be improved by adopting a water-running mode to perform the focalization calculation.
Description
Technical field
The present invention relates to the diasonograph field, particularly relate to the implementation method and the equipment that focus on calculating in the continuous Doppler ultrasound system.
Background technology
In ultrasonic image-forming system, Doppler effect is widely used in the detection of blood flow.Ultrasonic transducer emission ultrasound wave receives the ultrasonic echo that returns in the subject in subject.In blood vessel, the erythrocyte of motion is to ultrasonic scatterer, and this scattering meeting makes the Frequency generated skew of ultrasonic echo.The size of frequency shift (FS) and hyperacoustic mid frequency of emission, erythrocytic movement velocity are relevant.Doppler effect is divided into again two kinds of impulse wave and continuous waves, and in general, the Doppler effect of impulse wave is subjected to the impact of investigation depth and pulse recurrence frequency, only limits to the low speed blood flow, such as carotid artery, and the blood flow in the Hepatic artery etc.The Doppler effect of continuous wave is not subjected to the impact of pulse recurrence frequency, can be used for detecting the high speed blood flow, such as heart.Reach maximum for making emission and receiving backward energy, need the different passage emissions at focusing place and the echo that receives to focus on calculating.
Fig. 1 shows the baseband signal handling process of traditional continuous wave ultrasound doppler frequency spectrum analysis system.Calculate the transmitter, phase of different passages and the receiving phase of different passages according to focal position and tranmitting frequency, different passages obtains transmit square waves behind the transmitter, phase, receiving phase with all passages sends to demodulator simultaneously, the reception signal of passage obtains the IQ component through behind the demodulator, different passage IQ components directly merge, through after a series of simulation process, the AD device is transformed to digital signal with analogue signal.Then process through wall filtering.Wall filtering is a high pass filter, and filtering is because the strong echo that histokinesis static or at a slow speed causes.After the wall filtering processing, IQ two-way component is sent into the spectrum estimation module.The spectrum estimation module generally adopts fast fourier transform (FFT) to come the estimated power spectrum.Counting of fast fourier transform can be 128 or 256 points.Because the power spectrum dynamic range that estimates is too large, the power spectrum that at every turn estimates need to be processed through overcompression, is compressed to the gray scale indication range.The last Doppler frequency spectrum figure that shows at screen is certain time, the power spectrum intensity of certain speed (frequency shift (FS)).
On principle, for improving backward energy, must make the phase place that transmits when arriving focus of different passages identical, the phase place when making simultaneously the reception signal merging from focus to different passages is identical.
Check in heart and the arteriovenous system at the using ultrasound Doppler technology, need to focus on a plurality of emissions and receive path, calculate the phase place of the different transmission channels of focal spot and receive path.
In the prior art, have such transmitting focusing algorithm: with various different passages, the transmitter, phase at different coordinate positions place is precalculated, make a table, in when emission, as address lookup table, obtain current transmitter, phase with current coordinate and channel number.Obtain emission or the phase place of receive path with look-up table, simple and convenient, hardware does not have complicated calculating, only need query caching, but for than multichannel, when phase accuracy is larger, the memory space of table is very large, for example, be 32 passages if transmit and receive, phase place 4 bit quantizations, the coordinate on whole plane is 100mm * 100mm, the storage size of table is 2560K so, and memory space is excessive, needs to consume a large amount of storage resources.Simultaneously, along with the memory space increase of table, the efficient of inquiry also can correspondingly reduce.
In the prior art, also have a kind of focusing algorithm that transmits and receives of ASIC mode, for each emission, receive path has a phase calculation unit, and the receiving phase of emission or demodulation is provided.This algorithm can consume a lot of multipliers, square root extractor, division device for each transmits and receives focusing parameter computing unit of passage configuration.If realize with programming device, when transmitting and receiving passage when more, the computational resource of consumption can be very many.
Therefore, need to provide the method and apparatus that focuses on calculating, can when calculating focusing parameter, save the computational resource that consumes.
Summary of the invention
The mode that the purpose of this invention is to provide to save computational resource focuses on the method and apparatus of calculating.
According to a first aspect of the invention, provide a kind of method for focus on calculating at Doppler ultrasound system, it is characterized in that, may further comprise the steps:
A, obtain focal coordinates;
B, obtain wavelength or the velocity of sound;
C, calculating passage coordinate;
D, according to described focal coordinates, passage coordinate, and described wavelength or the velocity of sound, the focusing parameter accountant that adopts interchannel to share calculates the focusing parameter of each passage.
According to the present invention, can provide focal coordinates by software, programming device adopts the shared accountant of interchannel according to wavelength or the velocity of sound and channel pitch information, obtains the time delay of reception or transmitter, phase or reception or the emission of passage.For specific tranmitting frequency, software is with wavelength, channel pitch information is preset in the depositor or other memory device of programming device, when entering the continuous wave Doppler pattern, focal coordinates information is write depositor or other memory device of programming device by software, each moving focal point, the focal coordinates of depositor are updated, in case focal coordinates are updated, programming device will calculate with respect to this focus all transmit and receive the phase place of passage and the time delay of emission or reception.Then focusing parameter is sent to transmitter unit and receiving element, transmitter unit produces square wave according to focusing parameter, and receiving element sends to the outer demodulation device of sheet with focusing parameter.
In order to improve computational efficiency, can adopt the mode of flowing water to focus on calculating: will calculate the related data serial input of focusing parameter to the input of accountant, and according to traditional streamline method of operation, computational process is divided into a plurality of stages, make first certain overlapping of computational process and the computational process generation of the data of rear input of data of input, in outfan serial output result of calculation, namely can be embodied as pipeline computing.Preferably, can calculate according to channel position the coordinate of respective channel, and calculate focusing parameter in conjunction with other related data, like this at the coordinate time that calculates different passages, by channel position being become the channel position of the passage that pending focusing calculates, just can calculate the focusing parameter of respective channel.
According to a second aspect of the invention, provide a kind of equipment for focus on calculating at Doppler ultrasound system, it is characterized in that, having comprised:
Data acquisition facility is used for obtaining focal coordinates and wavelength or the velocity of sound;
Passage coordinate Calculation device is for the passage coordinate of the passage that calculates pending focusing calculating;
The focusing parameter accountant is connected with passage coordinate Calculation device with described data acquisition facility, is used for according to described focal coordinates, passage coordinate, and the focusing parameter of described wavelength or at least two passages of velocity of sound calculating.
When detecting coordinate and change, provide enabling signal, channel position is provided by enumerator, and the calculating of focusing parameter is determined by channel position is unique.
The computational resource that the present invention adopts interchannel to share focuses on calculating, can save a large amount of computational resources.Adopt the mode of flowing water to focus on calculating, can improve the degree of parallelism of calculating, particularly calculate the coordinate of respective channel according to channel position and channel pitch, can be at the coordinate time that calculates each passage, by channel position being become the channel position of the passage that pending focusing calculates, calculate the coordinate of respective channel, thereby can improve the efficient of calculating, and increase and transmit and receive in the situation that the order of passage changes arbitrarily at port number, calculate the hardware resource that consumes and can remain unchanged for focusing on.
Description of drawings
Come the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is the continuous wave Doppler signal processing flow figure according to prior art;
Fig. 2 is the sketch map that calculates of channel distance according to an embodiment of the invention;
Fig. 3 is the sketch map of phase calculation process according to an embodiment of the invention;
Fig. 4 is that channel position starts sequential chart according to an embodiment of the invention;
Fig. 5 is transmitter, phase sequential chart according to an embodiment of the invention.
Fig. 6 is the flow chart that is used for focusing at Doppler ultrasound system according to an embodiment of the invention the method for calculating.
Fig. 7 is the block diagram that is used for focusing at Doppler ultrasound system according to an embodiment of the invention the equipment of calculating.
The specific embodiment
Generally speaking, the method for focus on calculating at Doppler ultrasound system according to the present invention may further comprise the steps: obtain focal coordinates; Obtain wavelength or the velocity of sound; Calculate the passage coordinate; According to focal coordinates, passage coordinate, and wavelength or the velocity of sound, adopt the shared focusing parameter accountant of interchannel, calculate the focusing parameter of each passage.Below in conjunction with Fig. 2 to Fig. 5 it is specifically described.
Fig. 2 is channel distance computation structure figure according to an embodiment of the invention, and as shown in the figure, passage is equidistantly arranged, and half of passage is used for emission, and second half is used for receiving.The coordinate of screen is positioned in the middle of transmission channel and the receive path zero point.Suppose that tranmitting frequency is f0, the 2 dimension space coordinates that transmit and receive focus point are x and y, and channel spacing is d, and channel number is i, and then each passage arrives the as follows apart from computing formula of focus:
Obtain passage after the distance of focus, computed range is to the remainder of wavelength:
Remainder is quantized according to required precision, obtains the phase value of each passage:
p
i＝round(l
i*2.^k) (3)
Wherein k is the bit number of quantification.
The sketch map of phase calculation process as shown in Figure 3 according to an embodiment of the invention.Whether the coordinate figure of judging at first by the following method current focus in the depositor changes: abscissa x and the vertical coordinate y of focus are postponed, compare with the value that postpones and current value, if the length of delay of x coordinate is identical with the x coordinate figure, and the length of delay of y coordinate is identical with the y coordinate figure, then think and do not start the phase calculation process by the current focus invariant position; If the length of delay of x coordinate is different with the x coordinate figure, or the length of delay of y coordinate is different with the y coordinate figure, then thinks to provide a pulse index signal by the current focus position change, restarts the phase calculation process.
After coordinate measurement, count control.Counting control is finished by counting control unit.This unit is the single enumerator, and when current areal coordinate change pulse index signal arrived, the electric circuit inspection pulse edge resetted count control device, stops counting after counting down to certain value.The sequential of this counting process as shown in Figure 4.Come reset counter with enabling signal among Fig. 4, until enumerator is added to maximum port number., multiply each other with channel spacing as the sequence number that transmits and receives passage with count value, namely obtain the id in the formula (1).According to the result of calculation of this id, calculate the abscissa of passage, the abscissa with the abscissa x of focus deducts the passage that calculates namely obtains calculating focus to the required horizontal component value of distance of passage.Usually the behavior axis of abscissas that the coordinate system of setting up this moment is lined up with each passage, therefore, the vertical coordinate of each passage is 0.Because the vertical coordinate of each passage is 0, therefore calculate focus is focal coordinates to the required vertical component value of the distance of passage vertical coordinate y.With squarer horizontal component value and vertical component value are carried out square operation, afterwards the result of square operation sued for peace, to gained and carry out extracting operation, the value of extracting operation gained is passage to the distance of focus, when calculating different passages to focal length, only need to upgrade channel position, just can calculate by associative operation the coordinate of respective channel, and then calculate passage to the distance of focus.After calculating distance, get rid of the integral multiple apart from medium wavelength, obtain remainder, then the remainder displacement is amplified, divided by wavelength, the merchant of gained is the phase value of passage.
Therefore have the delay of about tens clocks in whole computational process, when the phase result serial provides after, demultiplexing walks abreast and provides the phase value of each passage, and this carries out serial to parallel conversion by the phase place that serial is provided, and is assigned to different passages and finishes.The delay of calculating is for calculating the condition of having created by pipeline mode.The input of the related data serial input of channel phases to accountant will be calculated, and according to traditional streamline method of operation, computational process is divided into a plurality of stages, make first certain overlapping of computational process and the computational process generation of the data of rear input of data of input, in outfan serial output result of calculation, namely can be embodied as pipeline computing.Preferably, can calculate according to channel position the horizontal position components of respective channel, and the upright position component of the joint passage and other related data calculate the phase place of passage, like this at the passage coordinate time that calculates different passages, by channel position being become the channel position of the passage that pending focusing calculates, calculate the passage coordinate of respective channel.Because the handling duration of concrete device is different, therefore computational process being divided into a plurality of stages can divide the device set that operates in the stages or the processing such as postpone according to concrete needs, so that total duration of stages is near each other, so more be conducive to pipeline computing.
Above-mentioned computational process is except calculating the phase place of each passage, also can calculate other focusing parameter, for example can be according to the focus of calculating to the distance of passage, according to mode well known in the art, calculate the time delay of reception or the emission of each passage according to this distance and the velocity of sound.
Fig. 5 illustrates according to an embodiment of the invention transmitter, phase sequential chart.Producing tranmitting frequency in programming device inside is the square wave of f0, square wave is postponed some parts according to the precision that quantizes, take one of them as the basis, corresponding to phase place 0, the rest may be inferred for other, according to the phase value of each transmission channel that calculates, from the square wave that postpones, take out waveform as the transmitted waveform of this passage.In Fig. 5, tranmitting frequency is lower than clock frequency, and T0 to T4 is the transmitted waveform of passage, and dutycycle is that 50% square wave is launched continuously, and the phase place of different passages is different, for receive path, directly each channel phases is outputed to the outside demodulator that links to each other.
Although the above has described according to channel position and has calculated the coordinate of respective channel to calculate passage to the distance of focus, but be appreciated that, this is not to share the essential condition that computational resource calculates channel phases, shared accountant also can adopt alternate manner to realize, as long as coordinate and other related data of each passage can be provided, the computational resource that just can adopt interchannel to share calculates the focusing parameters such as time delay of channel phases and reception or emission.
Fig. 6 illustrates the method that is used for focusing at Doppler ultrasound system according to an embodiment of the invention calculating.As shown in the figure, after process begins, in step 601, obtain focal coordinates; In step 602, obtain wavelength or the velocity of sound; In step 603, calculate the passage coordinate; In step 604, according to focal coordinates, passage coordinate, and wavelength or the velocity of sound, adopt the shared focusing parameter accountant of interchannel, calculate the focusing parameter of each passage.
Fig. 7 illustrates the equipment 700 that is used for focusing at Doppler ultrasound system according to an embodiment of the invention calculating, comprising: data acquisition facility 701 is used for obtaining focal coordinates and wavelength or the velocity of sound; Passage coordinate Calculation device 702 is for the passage coordinate of the passage that calculates pending focusing calculating; Focusing parameter accountant 703 is connected with passage coordinate Calculation device with data acquisition facility, is used for according to focal coordinates, passage coordinate, and the focusing parameter of described wavelength or at least two passages of velocity of sound calculating.
Focus on the equipment that calculates and also can comprise coordinate detecting device, whether change for detection of described focal coordinates.Passage coordinate Calculation device comprises: counting control unit, for generation of the channel position of count value as the passage of pending focusing calculating; The channel spacing acquiring unit is used for the Acquisition channel interval; The coordinate Calculation unit is connected with the channel spacing acquiring unit with counting control unit, is used for calculating the passage coordinate according to described channel position and channel spacing.The focusing parameter accountant comprises: metrics calculation unit is used for calculating passage to the distance of focus according to described passage coordinate and focal coordinates; Parameter calculation unit links to each other with described metrics calculation unit, is used for according to the distance of passage to focus, and the focusing parameter of wavelength or velocity of sound calculating passage.Focusing parameter comprises the time delay of reception or transmitter, phase or reception or the emission of passage.
The following describes the process of utilizing equipment 700 to focus on calculating.After depositor or other memory device obtain focal coordinates and wavelength or the velocity of sound, adopt passage coordinate Calculation device 702 to calculate the passage coordinate of the passage that pending focusing calculates with data acquisition facility 701.Counting control unit in the passage coordinate Calculation device 702 produces count value as the channel position of the passage of pending focusing calculating, the channel spacing acquiring unit is the Acquisition channel interval from depositor or other memory device, then, the coordinate Calculation unit calculates the passage coordinate according to channel position and channel spacing.Calculate after the passage coordinate, metrics calculation unit in the focusing parameter accountant 703 is calculated passage to the distance of focus according to passage coordinate and focal coordinates, then, to the distance of focus, and wavelength or the velocity of sound are calculated the focusing parameter of passage to parameter calculation unit according to passage.Focusing parameter comprises the time delay of reception or transmitter, phase or reception or the emission of passage.Comprise in the situation of coordinate detecting device at the focusing computing equipment, obtain after the focal coordinates, whether at first detect described focal coordinates by this device changes, if detect and show that focal coordinates change, then carry out above-mentioned computational process, show that focal coordinates do not change if detect, then do not start above-mentioned computational process.
Although below in conjunction with specific embodiments and describe the present invention with reference to the accompanying drawings, but it is to be understood that, the invention is not restricted to the particular form of these specific embodiments, under the prerequisite that does not deviate from the determined spirit and scope of claim, can carry out various modifications and change to the present invention.
Claims (10)
1. a method that is used for focusing at Doppler ultrasound system calculating is characterized in that, may further comprise the steps:
A, obtain focal coordinates;
B, obtain wavelength or the velocity of sound;
C, calculating passage coordinate;
D, according to described focal coordinates, passage coordinate, and described wavelength or the velocity of sound, the focusing parameter accountant that adopts interchannel to share calculates the focusing parameter of each passage,
Wherein, step D comprises: calculate passage to the distance of focus according to described passage coordinate and focal coordinates; According to the distance of described passage to focus, and the focusing parameter of described wavelength or velocity of sound calculating passage, and described focusing parameter comprises the time delay of reception or transmitter, phase or reception or the emission of passage.
2. the method for claim 1 is characterized in that, described focal coordinates and wavelength obtain from the memory device of storing described focal coordinates and wavelength.
3. the method for claim 1 is characterized in that, described step C may further comprise the steps:
(a) Acquisition channel interval, and the initial count value that counting control unit is set;
The count value that (b) will read from counting control unit is as channel position, and the corresponding pending focusing of this channel position is calculated works as prepass;
(c) according to described channel position and channel spacing, calculate described passage coordinate when prepass;
(d) from described counting control unit, read next count value;
Repeating step (b), (c) and (d) are until count value reaches predetermined value.
4. method as claimed in claim 3 is characterized in that, described step D may further comprise the steps:
Whenever obtain a described passage coordinate when prepass, then carry out following steps:
According to described focal coordinates and passage coordinate, calculate described when the distance of prepass to focus;
Work as the distance that prepass arrives focus according to described, and described wavelength or the velocity of sound, described focusing parameter when prepass calculated.
5. the method for claim 1 is characterized in that, described steps A is further comprising the steps of:
A1, obtain after the focal coordinates, judge whether focal coordinates change, if change, then proceed step B, C and D, if do not change, then not setting up procedure B, C and D.
6. method as claimed in claim 5 is characterized in that, described steps A 1 may further comprise the steps:
Abscissa x and the vertical coordinate y of focus are postponed, compare with the value that postpones and current value;
If the length of delay of x coordinate is identical with the x coordinate figure, and the length of delay of y coordinate is identical with the y coordinate figure, then thinks the current focus invariant position;
If the length of delay of x coordinate is different with the x coordinate figure, or the length of delay of y coordinate is different with the y coordinate figure, then thinks the current focus position change.
7. such as claim 3 or 4 described methods, it is characterized in that: described step (b), (c) and (d) adopt the mode of streamline to carry out.
8. an equipment that is used for focusing at Doppler ultrasound system calculating is characterized in that, comprising:
Data acquisition facility is used for obtaining focal coordinates and wavelength, or is used for obtaining focal coordinates and the velocity of sound;
Passage coordinate Calculation device is for the passage coordinate of the passage that calculates pending focusing calculating;
The focusing parameter accountant is connected with passage coordinate Calculation device with described data acquisition facility, is used for according to described focal coordinates, passage coordinate, and the focusing parameter of described wavelength or at least two passages of velocity of sound calculating;
Wherein, described focusing parameter accountant comprises:
Metrics calculation unit is used for calculating passage to the distance of focus according to described passage coordinate and focal coordinates;
Parameter calculation unit links to each other with described metrics calculation unit, is used for according to the distance of described passage to focus, and the focusing parameter of described wavelength or velocity of sound calculating passage,
And described focusing parameter comprises the time delay of reception or transmitter, phase or reception or the emission of passage.
9. equipment as claimed in claim 8 is characterized in that, also comprises:
Whether coordinate detecting device changes for detection of described focal coordinates.
10. equipment as claimed in claim 8 is characterized in that, described passage coordinate Calculation device comprises:
Counting control unit is for generation of the channel position of count value as the passage of pending focusing calculating;
The channel spacing acquiring unit is used for the Acquisition channel interval;
The coordinate Calculation unit is connected with the channel spacing acquiring unit with counting control unit, is used for calculating the passage coordinate according to described channel position and channel spacing.
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| CN108433742A (en) * | 2018-03-29 | 2018-08-24 | 东南大学 | A kind of full depth frequency displacement search type transcranial Doppler detection device of portable modulus and method |
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| CN2135336Y (en) * | 1992-07-14 | 1993-06-09 | 西安交通大学 | Digital ultrasonic blood flow rate measruing meter |
| US6042547A (en) * | 1994-08-05 | 2000-03-28 | Acuson Corporation | Method and apparatus for receive beamformer system |
| EP1683486A1 (en) * | 2003-10-17 | 2006-07-26 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic doppler blood flow measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2135336Y (en) * | 1992-07-14 | 1993-06-09 | 西安交通大学 | Digital ultrasonic blood flow rate measruing meter |
| US6042547A (en) * | 1994-08-05 | 2000-03-28 | Acuson Corporation | Method and apparatus for receive beamformer system |
| EP1683486A1 (en) * | 2003-10-17 | 2006-07-26 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic doppler blood flow measuring device |
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