CN101467895A - 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 is offset the frequency of ultrasonic echo.The size of frequency shift (FS) and the mid frequency of ultrasonic waves transmitted, erythrocytic movement velocity are relevant.Doppler effect is divided into two kinds of impulse wave and continuous waves again, and in general, the Doppler effect of impulse wave is subjected to the influence of investigation depth and pulse recurrence frequency, only limits to the low speed blood flow, as carotid artery, and the blood flow in the Hepatic artery etc.The Doppler effect of continuous wave is not subjected to the influence of pulse recurrence frequency, can be used for detecting the high speed blood flow, 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 received 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.Handle through wall filtering then.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 big, the power spectrum that at every turn estimates need be handled through overcompression, is compressed to the gray scale indication range.The last Doppler frequency spectrum figure that shows on 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 the received signal merging from focus to different passages simultaneously is identical.
Check in heart and the arteriovenous system at the using ultrasound Doppler technology, need focus on, calculate the phase place of different transmission channels of focal spot and receive path a plurality of emissions and receive path.
In the prior art, have such emission focusing algorithm: with various different passages, the transmitter, phase at different coordinate positions place calculates in advance, make a table, in when emission, as address lookup table, obtain current transmitter, phase with current coordinate and channel number.Obtain the 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 big, the memory space of table is very big, for example, be 32 passages, phase place 4 bit quantizations if transmit and receive, whole planar coordinate is 100mm * 100mm, Biao storage size 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 all has a phase calculation unit, and emission or demodulated received phase place are 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 that with programming device when transmitting and receiving passage more for a long time, the computational resource of consumption can be very many.
Therefore, need provide to focus on Calculation Method and device, can when calculating focusing parameter, save the computational resource that is consumed.
Summary of the invention
The mode that the purpose of this invention is to provide to save computational resource focuses on Calculation Method and device.
According to a first aspect of the invention, provide a kind of being used for to focus on Calculation Method, it is characterized in that, may further comprise the steps at Doppler ultrasound system:
A, obtain focal coordinates;
B, obtain the wavelength or the velocity of sound;
C, calculating passage coordinate;
D, according to described focal coordinates, passage coordinate, and the described wavelength or the velocity of sound adopt the shared focusing parameter accountant of interchannel, calculate 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 the 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: the related data serial that will calculate focusing parameter is input to the input of accountant, and according to traditional streamline method of operation, computational process is divided into a plurality of stages, make the data computing process of input earlier and the data computing process of back input produce certain overlapping, in outfan serial output result of calculation, promptly can be embodied as flowing water and calculate.Preferably, can calculate the coordinate of respective channel according to channel position, and calculate focusing parameter, like this at the coordinate time that calculates different passages in conjunction with other related data, 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 that is used for focusing on calculating, it is characterized in that, having comprised at Doppler ultrasound system:
Data acquisition facility is used to obtain focal coordinates and wavelength or the velocity of sound;
Passage coordinate Calculation device is used to calculate the passage coordinate of the passage that pending focusing calculates;
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 present invention adopts the shared computational resource of interchannel to focus 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 under 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 a 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 Calculation Method according to an embodiment of the invention.
Fig. 7 is the block diagram that is used for focusing at Doppler ultrasound system the equipment of calculating according to an embodiment of the invention.
The specific embodiment
Generally speaking, be used for focusing on Calculation Method and may further comprise the steps according to of the present invention: obtain focal coordinates at Doppler ultrasound system; Obtain the wavelength or the velocity of sound; Calculate the passage coordinate; According to focal coordinates, passage coordinate, and the 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 quantized bit number.
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 current focus in the depositor at first by the following method changes: the abscissa x and the vertical coordinate y of focus are postponed, compare with 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 detects, 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, till enumerator is added to maximum port number., multiply each other as transmitting and receiving serial number of channels with count value, promptly obtain the id in the formula (1) with channel spacing.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 promptly obtains calculating the distance required horizontal component value of focus to passage.The behavior axis of abscissas that the coordinate system of setting up common 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, result to square operation sues for peace afterwards, to gained and carry out extracting operation, the value of extracting operation gained is the distance of passage to focus, when calculating different passages to focal length, only need to upgrade channel position, just can calculate the coordinate of respective channel, and then calculate the distance of passage to focus by associative operation.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.
Have the delay of about tens clocks in whole computational process, therefore after the phase result serial provided, demultiplexing walked 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 composes and finish for different passages.The delay of calculating is for calculating the condition of having created by pipeline mode.The related data serial of calculating channel phases is input to the input of accountant, and according to traditional streamline method of operation, computational process is divided into a plurality of stages, make the data computing process of input earlier and the data computing process of back input produce certain overlapping, in outfan serial output result of calculation, promptly can be embodied as flowing water and calculate.Preferably, can calculate the horizontal position components of respective channel according to channel position, and the phase place of calculating passage in conjunction with upright position component and other related data 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 difference of concrete device, therefore computational process being divided into a plurality of stages can divide the device set of operating in each stage or processing such as postpone according to concrete needs, so that total duration in each stage is near each other, so more helps flowing water and calculate.
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 the reception or the emission of each passage according to this distance and the velocity of sound.
Fig. 5 illustrates transmitter, phase sequential chart according to an embodiment of the invention.In the inner generation of programming device tranmitting frequency is the square wave of f0, square wave is postponed some parts according to quantized precision, based on one of them, corresponding to phase place 0, the rest may be inferred for other, according to the phase value of each transmission channel that is calculated, from the square wave that postpones, take out the transmitted waveform of waveform as 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 difference of different passages for receive path, directly outputs to each channel phases the outside demodulator that links to each other.
Though described above according to channel position and calculated the coordinate of respective channel to calculate the distance of passage to focus, but be appreciated that, this is not the essential condition that shared 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, just can adopt the shared computational resource of interchannel to calculate the focusing parameters such as time delay of channel phases and reception or emission.
Fig. 6 illustrates and is used for according to an embodiment of the invention focusing on Calculation Method at Doppler ultrasound system.As shown in the figure, after process begins, in step 601, obtain focal coordinates; In step 602, obtain the wavelength or the velocity of sound; In step 603, calculate the passage coordinate; In step 604, according to focal coordinates, passage coordinate, and the 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 calculating according to an embodiment of the invention, comprising: data acquisition facility 701 is used to obtain focal coordinates and wavelength or the velocity of sound; Passage coordinate Calculation device 702 is used to calculate the passage coordinate of the passage that pending focusing calculates; 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, be used to detect described focal coordinates and whether change.Passage coordinate Calculation device comprises: counting control unit is used to produce the channel position of count value as the passage of pending focusing calculating; The channel spacing acquiring unit is used to obtain channel spacing; 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 the distance of passage to 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 the reception or the emission of passage.
The following describes and utilize equipment 700 to focus on calculation process.After depositor or other memory device obtain focal coordinates and the 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 the channel position of count value as the passage of pending focusing calculating, the channel spacing acquiring unit obtains channel spacing 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 the distance of passage to 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 the reception or the emission of passage.Comprise under 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 the aforementioned calculation process, show that focal coordinates do not change if detect, then do not start the aforementioned calculation process.
Though 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 the present invention.
Claims (13)
1. one kind is used for focusing on Calculation Method at Doppler ultrasound system, it is characterized in that, may further comprise the steps:
A, obtain focal coordinates;
B, obtain the wavelength or the velocity of sound;
C, calculating passage coordinate;
D, according to described focal coordinates, passage coordinate, and the described wavelength or the velocity of sound adopt the shared focusing parameter accountant of interchannel, calculate the focusing parameter of each 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) obtain channel spacing, and the initial count value that counting control unit is set;
(b) count value that 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), calculate described passage coordinate when prepass according to described channel position and channel spacing;
(d) from described counting control unit, read next count value;
Repeating step (b), (c) and (d) reach predetermined value up to count 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, then carry out following steps when prepass:
According to described focal coordinates and passage coordinate, calculate described when the distance of prepass to focus;
According to the described distance of working as prepass to focus, and the described wavelength or the velocity of sound, described focusing parameter calculated when prepass.
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,, then proceed step B, C and D if change, 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:
The abscissa x and the vertical coordinate y of focus are postponed, compare with 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. as each described method among the claim 1-6, it is characterized in that: described focusing parameter comprises the time delay of reception or transmitter, phase or the reception or the emission of passage.
8. 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.
9. an equipment that is used for focusing at Doppler ultrasound system calculating is characterized in that, comprising:
Data acquisition facility is used to obtain focal coordinates and wavelength or the velocity of sound;
Passage coordinate Calculation device is used to calculate the passage coordinate of the passage that pending focusing calculates;
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.
10. equipment as claimed in claim 9 is characterized in that, also comprises:
Whether coordinate detecting device is used to detect described focal coordinates and changes.
11. equipment as claimed in claim 9 is characterized in that, described passage coordinate Calculation device comprises:
Counting control unit is used to produce the channel position of count value as the passage of pending focusing calculating;
The channel spacing acquiring unit is used to obtain channel spacing;
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.
12. equipment as claimed in claim 9 is characterized in that, described focusing parameter accountant comprises:
Metrics calculation unit is used for calculating the distance of passage to 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.
13. as each described equipment among the claim 9-12, it is characterized in that: described focusing parameter comprises the time delay of reception or transmitter, phase or the reception or the emission of passage.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104349719A (en) * | 2012-05-25 | 2015-02-11 | 富士胶片株式会社 | Ultrasound diagnostic device, and data processing method |
| 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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| 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 |
| US5685308A (en) * | 1994-08-05 | 1997-11-11 | Acuson Corporation | Method and apparatus for receive beamformer system |
| CN100443056C (en) * | 2003-10-17 | 2008-12-17 | 松下电器产业株式会社 | Ultrasonic doppler blood flow measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104349719A (en) * | 2012-05-25 | 2015-02-11 | 富士胶片株式会社 | Ultrasound diagnostic device, and data processing method |
| 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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