CN117204883A - Sampling line deflection angle determining method, device, equipment and medium - Google Patents
Sampling line deflection angle determining method, device, equipment and medium Download PDFInfo
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Abstract
The application discloses a method, a device, equipment and a medium for determining a deflection angle of a sampling line, which comprise the following steps: transmitting ultrasonic waves to a target position through a plurality of sampling lines to obtain a plurality of Doppler echo signals corresponding to the plurality of sampling lines; wherein the deflection angles of the sampling lines are different; determining a plurality of doppler blood flow velocities at the target location based on the plurality of doppler echo signals; an optimal sampling line deflection angle is determined based on the plurality of Doppler blood flow velocities and the plurality of deflection angles. Therefore, the Doppler blood flow velocities at the target position are obtained through the sampling lines with different deflection angles, then the optimal sampling line deflection angle is determined based on the Doppler blood flow velocities and the deflection angles, the optimal sampling line deflection angle can ensure that the included angle between the sound wave and the blood flow is optimal, so that the quality of Doppler frequency spectrum can be ensured, and a doctor does not need to manually adjust the Doppler frequency spectrum, so that the diagnosis efficiency can be improved.
Description
Technical Field
The present application relates to the field of ultrasound technologies, and in particular, to a method, an apparatus, a device, and a medium for determining a deflection angle of a sampling line.
Background
The basic principle of the ultrasonic diagnosis is that an ultrasonic transducer (probe) is excited by using an electronic waveform sent by a machine device to send out a mechanical wave with fixed frequency, the wave enters a human body and is reflected back to the transducer, a signal received by the transducer is converted into an electronic signal, and the electronic signal is processed in a related way and displayed on a display of the ultrasonic device for diagnosis by doctors. The PW (pulse doppler) diagnosis is a common diagnostic means for an ultrasonic device, and uses the doppler effect of sound waves to display doppler shift in a spectrum manner, and performs doppler sampling on a B-type image. When the frequency shift is positive, it is denoted as positive Xiang Bo, and when the frequency shift is negative, it is denoted as negative wave. As can be seen from fig. 1, the right spectral signal is acquired by the transducer in the sampling area in the left graph, the blood flow signal in the blood vessel is acquired, and the inclined vertical line indicates the direction of the sound wave emitted by the transducer, that is, indicates the sampling line.
At present, the image effect of signals obtained by PW diagnosis depends on the included angle between sound waves and blood flow, the deflection angle of a sampling line is unreasonably set, the quality of Doppler frequency spectrum can be affected, the phenomena of aliasing and the like are easy to occur, and the diagnosis error is caused. Therefore, a doctor user needs to manually adjust the deflection angle of the sampling line in the diagnosis process, and diagnosis efficiency is reduced.
Disclosure of Invention
Accordingly, the present application is directed to a method, apparatus, device and medium for determining a deflection angle of a sampling line, which can ensure the quality of a doppler spectrum and improve the diagnostic efficiency. The specific scheme is as follows:
in a first aspect, the application discloses a method for determining a deflection angle of a sampling line, which comprises the following steps:
transmitting ultrasonic waves to a target position through a plurality of sampling lines to obtain a plurality of Doppler echo signals corresponding to the plurality of sampling lines; wherein the deflection angles of the sampling lines are different;
determining a plurality of doppler blood flow velocities at the target location based on the plurality of doppler echo signals;
an optimal sampling line deflection angle is determined based on the plurality of Doppler blood flow velocities and the plurality of deflection angles.
Optionally, the determining an optimal sampling line deflection angle based on the plurality of doppler blood flow velocities and the plurality of deflection angles includes:
determining an independent variable value corresponding to a maximum function value of a target cosine function curve in a preset independent variable range based on the Doppler blood flow speeds and the deflection angles; the target cosine function curve takes the deflection angle of a sampling line as an independent variable and Doppler blood flow velocity as a dependent variable;
and determining an optimal sampling deflection angle based on the independent variable value.
Optionally, the determining, based on the doppler blood flow velocities and the deflection angles, a self-variable value corresponding to a maximum function value of the objective cosine function curve in a preset independent variable range includes:
constructing a formula of a target cosine function curve based on a Doppler effect formula;
determining a set of calculation equations based on the formula of the object cosine function curve, the plurality of Doppler blood flow velocities, and the plurality of deflection angles;
and calculating the self-variable value corresponding to the maximum function value of the objective cosine function curve in the preset independent variable range by using the calculation equation set.
Optionally, the determining the optimal sampling deflection angle based on the argument value includes:
judging whether the independent variable value is in a deflection angle range supported by a system or not;
if the independent variable value is in the range of the deflection angle which can be supported by the system, determining the independent variable value as the optimal sampling line deflection angle;
if the independent variable value is not in the deflection angle range which can be supported by the system, respectively determining the difference value between the independent variable value and two boundary values of the deflection angle range which can be supported by the system, and determining the boundary value corresponding to the smaller difference value as the optimal sampling line deflection angle.
Optionally, the method further comprises:
and scanning based on the optimal sampling line deflection angle, judging whether a deflection angle redetermination condition is met in the scanning process, and redefining the optimal sampling line deflection angle if the deflection angle redetermination condition is met.
Optionally, the scanning based on the optimal sampling line deflection angle and judging whether the deflection angle redetermination condition is met in the scanning process include:
determining a target sampling line based on the optimal sampling line deflection angle;
transmitting ultrasonic waves through the target sampling line to obtain a target Doppler echo signal corresponding to the target sampling line;
generating a Doppler spectrogram based on the target Doppler echo signal;
and judging whether a deflection angle redetermination condition is met or not based on the change condition of the Doppler spectrogram.
Optionally, the determining whether the deflection angle redetermination condition is satisfied includes:
acquiring a gray-scale ultrasonic section image;
and judging whether a deflection angle redetermining condition is met or not based on the change condition of the gray-scale ultrasonic section image.
Optionally, after the redetermining the optimal sampling line deflection angle, the method further includes:
calculating a difference value between the redetermined optimal sampling line deflection angle and the original optimal sampling line deflection angle;
and judging whether the difference value is smaller than a preset threshold value, if so, continuing scanning based on the original optimal sampling line deflection angle, otherwise, scanning based on the redetermined optimal sampling line deflection angle.
In a second aspect, the present application discloses a sampling line deflection angle determining apparatus, comprising:
the Doppler echo signal acquisition module is used for transmitting ultrasonic waves to the target position through a plurality of sampling lines to obtain a plurality of Doppler echo signals corresponding to the plurality of sampling lines; wherein the deflection angles of the sampling lines are different;
a doppler blood flow velocity determination module for determining a plurality of doppler blood flow velocities at the target location based on the plurality of doppler echo signals;
and the sampling line deflection angle determining module is used for determining an optimal sampling line deflection angle based on the Doppler blood flow speeds and the deflection angles.
In a third aspect, the application discloses an ultrasound device comprising a processor and a memory; wherein,
the memory is used for storing a computer program;
the processor is configured to execute the computer program to implement the aforementioned sampling line deflection angle determination method.
In a fourth aspect, the present application discloses a computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the aforementioned method for determining a sampling line deflection angle.
According to the Doppler echo signal processing method, ultrasonic waves are transmitted to the target position through a plurality of sampling lines, and a plurality of Doppler echo signals corresponding to the sampling lines are obtained; and determining a plurality of Doppler blood flow speeds at the target position based on the Doppler echo signals, and finally determining an optimal sampling line deflection angle based on the Doppler blood flow speeds and the deflection angles. Therefore, the Doppler blood flow velocities at the target position are obtained through the sampling lines with different deflection angles, then the optimal sampling line deflection angle is determined based on the Doppler blood flow velocities and the deflection angles, the optimal sampling line deflection angle can ensure that the included angle between the sound wave and the blood flow is optimal, so that the quality of Doppler frequency spectrum can be ensured, and a doctor does not need to manually adjust the Doppler frequency spectrum, so that the diagnosis efficiency can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an ultrasound image display provided by the present application;
FIG. 2 is a flow chart of a method for determining the deflection angle of a sampling line;
FIG. 3 is a flowchart of a specific sample line deflection angle determination according to the present application;
FIG. 4 is a schematic diagram of a cosine function curve according to an embodiment of the present application;
FIG. 5 is a schematic view showing a specific sample line deflection angle according to the present application;
FIG. 6 is a schematic view illustrating a specific sample line deflection angle adjustment according to the present application;
FIG. 7 is a schematic diagram of a device for determining a deflection angle of a sampling line according to the present application;
fig. 8 is a structural diagram of an ultrasonic device provided by the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
At present, the image effect of signals acquired by PW diagnosis depends on the included angle between sound waves and blood flow, and when the included angle between sound waves and blood flow is changed due to the movement of a human body or a probe, the form of Doppler spectrum signals is changed, so that the result of relevant measurement items of PW diagnosis is changed, and the result is inaccurate. The deflection angle of the sampling line is unreasonable, the quality of Doppler frequency spectrum can be affected, and phenomena such as aliasing and the like are easy to occur, so that diagnosis errors are caused. Therefore, a doctor user needs to manually adjust the deflection angle of the sampling line in the diagnosis process, and diagnosis efficiency is reduced. Therefore, the application provides a sampling line deflection angle determining scheme which can ensure the quality of Doppler frequency spectrum and improve diagnosis efficiency.
The method for determining the deflection angle of the sampling line can be applied to an application scene comprising ultrasonic equipment. The ultrasound device is configured with at least one ultrasound probe. In an actual application scene, the ultrasonic equipment controls one ultrasonic probe in a working state to emit ultrasonic waves to a blood vessel at a target position through a plurality of sampling lines, determines an optimal sampling line deflection angle, and triggers the ultrasonic probe in the working state to deflect and sample the blood vessel at the target position based on the optimal sampling line deflection angle. The ultrasonic equipment generates a corresponding vascular ultrasonic image based on Doppler echo signals obtained by deflection sampling, and meanwhile, can analyze blood flow signals to output blood flow parameter measurement results.
Referring to fig. 2, an embodiment of the present application discloses a method for determining a deflection angle of a sampling line, and an execution subject of the method may be an ultrasonic apparatus. The method comprises the following steps:
step S11: transmitting ultrasonic waves to a target position through a plurality of sampling lines to obtain a plurality of Doppler echo signals corresponding to the plurality of sampling lines; wherein the deflection angle of the sampling line is different from one sampling line to another.
Optionally, the ultrasound device transmits a doppler ultrasound signal to the target location, the doppler ultrasound signal generating a doppler echo signal based on reflection, refraction, etc. of the target location, the ultrasound device receiving the doppler echo signal. The target location may be a portion of the object to be detected that contains a blood vessel, such as the heart.
It should be noted that the deflection angle of the sampling line, i.e. the angle of the angle between the sampling line and the vertical direction, is positive for left-hand deflection and negative for right-hand deflection. Wherein the vertical direction is the scanning direction of the ultrasonic probe, namely the depth direction. In one embodiment, the number of sampling lines and the deflection angle may be preset, and the number may be greater than or equal to 3. In another embodiment, the deflection angle of one sampling line of the plurality of sampling lines may be empirically set by a user, and the deflection angles of other sampling lines may be determined based on the deflection angle of the sampling line set by the user, for example, 3 sampling lines, and the deflection angles of the other two sampling lines may be set based on the deflection angle of the sampling line set by the user, so that the other two sampling lines are offset one left and one right with respect to the sampling line set by the user, and of course, may be all on one side of the sampling line set by the user.
Step S12: a plurality of doppler blood flow velocities at the target location is determined based on the plurality of doppler echo signals.
In one embodiment, an autocorrelation algorithm may be employed to calculate the Doppler blood flow velocity of each Doppler echo signal at the target location.
Step S13: an optimal sampling line deflection angle is determined based on the plurality of Doppler blood flow velocities and the plurality of deflection angles.
It should be noted that the Doppler effect is a common effect in nature, and is first discovered by Austrian scientist Christan Doppler in 1842, and is called Doppler effect. The doppler effect is a phenomenon that when a sound source and a sound wave are relatively moved between receiving points, the sound wave received by the receiving points and the sound wave emitted by the source are relatively shifted in frequency. For ultrasonic Doppler, the Doppler effect produced by the action of ultrasonic waves and moving blood flow occurs both in the process of receiving ultrasonic waves by moving blood cells or moving ultrasonic scatterers in the blood flow and in the process of reflecting after the blood cells receive ultrasonic waves. The doppler effect formula is as follows:
wherein θ represents an included angle between the ultrasonic wave and the flow direction of blood flow; v represents the true blood flow velocity; f (f) D Is the calculated frequency shift of the blood flow signal, f when the included angle theta is 0 D The value of the blood flow velocity is closest to the real velocity V of blood flow, and the value is the largest; c represents the motion velocity of sound waves in human tissue and can be considered as a constant 1540m/s; f (f) c Is emitted by an ultrasonic probeCenter frequency in MHz.
According to the Doppler effect formula, the deflection angles and the points corresponding to the multiple common blood flow speeds are all on a cosine function curve taking the deflection angle of a sampling line as an independent variable and taking the Doppler blood flow speed as a dependent variable, and the smaller the included angle between the actual flow direction of the blood flow and the PW sampling line is, the larger the calculated blood flow speed is, the closer the calculated blood flow speed is to the actual blood flow speed, so that the Doppler blood flow speed corresponding to the deflection angle of the optimal sampling line is the maximum value of the curve or a larger value adjacent to the maximum value.
Therefore, in one implementation manner, the embodiment of the present application determines, based on the plurality of doppler blood flow velocities and the plurality of deflection angles, a self-variable value corresponding to a maximum function value of the objective cosine function curve within a preset independent variable range; the target cosine function curve takes the deflection angle of a sampling line as an independent variable and Doppler blood flow velocity as a dependent variable; and determining an optimal sampling deflection angle based on the independent variable value.
Further, a formula of an objective cosine function curve can be constructed based on a Doppler effect formula; determining a set of calculation equations based on the formula of the object cosine function curve, the plurality of Doppler blood flow velocities, and the plurality of deflection angles; and calculating the self-variable value corresponding to the maximum function value of the objective cosine function curve in the preset independent variable range by using the calculation equation set.
Referring to fig. 3, fig. 3 is a flowchart illustrating a specific sample line deflection angle determination according to an embodiment of the present application. Taking PW sampling lines with 3 deflection angles gamma, alpha and beta as an example, acquiring Doppler echo signals of gamma, alpha and beta, operating by a user, moving a sampling frame (RG) to a target position for diagnosis, self-adjusting, determining the deflection angle gamma of the sampling line, firstly acquiring Doppler echo signals corresponding to gamma, then automatically adjusting the sampling line direction by a system background, wherein the user cannot observe the angle change of the sampling line at the moment, the internal adjustment is realized, the deflection angles are respectively alpha and beta, and more than one can be needed, and the corresponding Doppler echo signals can be respectively acquired. Then, calculating Doppler blood flow velocity at the sampling frame under different angles of gamma, alpha and beta, calculating Doppler blood flow velocity at the sampling frame under different angles by using an autocorrelation algorithm, and calculating the larger the blood flow velocity is and the closer to the real blood flow velocity is according to a Doppler effect formula, wherein the smaller the included angle between the actual flow direction of the blood flow and the sampling line is. Therefore, the greater the absolute value, the closer the Doppler blood flow velocity calculated from Doppler echo signals of different angles such as gamma, alpha, beta, etc. is to the true blood flow velocity and angle. Therefore, a coordinate system based on the deflection Angle (included Angle with the vertical direction, direction) and the doppler blood flow velocity V can be constructed, the Y axis represents the doppler blood flow velocity (absolute value), the X axis represents the deflection Angle, and the X axis coordinate range is [ -90, 90] degrees, as shown in fig. 4, and fig. 4 is a schematic diagram of a specific cosine function curve disclosed in the embodiment of the present application. Four points of P1 (alpha, V1), P2 (beta, V2), P3 (gamma, V3) and P (phi, V4) are all on a cosine curve L, wherein V1, V2, V3 and V4 respectively represent Doppler blood flow velocity corresponding to gamma, alpha, beta and phi, and phi represents the optimal sampling line deflection angle.
Further, because of f in the Doppler effect equation c All of c, 2 are constants or fixed values, i.e. f at different deflection angles c C are all identical, so the doppler equation can be simplified to the equation v=v blood * cos (x-delta), V denotes Doppler blood flow velocity, V blood The true velocity of blood flow is represented by x, the deflection angle of the sampling line is represented by delta, and the included angle between the blood flow direction and the vertical direction is represented by delta. The following set of calculation equations can thus be derived:
V1＝V blood *cos(α-Δ)
V2＝V blood *cos(β-Δ)
V3＝V blood *cos(γ-Δ)
V4＝V blood *cos(φ-Δ)
when (when)V4=v can be obtained blood Therefore, V can be found from the above-mentioned system of calculation equations and cosine-related trigonometric function blood And delta, and then the optimal sampling line deflection angle phi is obtained. For example, see FIG. 5, FIG. 5A specific sample line deflection angle schematic diagram is disclosed.
Of course, in other embodiments, a curve fitting approximation may be utilized and an optimal sampling line deflection angle determined based on the plurality of Doppler blood flow velocities and the plurality of deflection angles. The basis of this scheme is still that the four points P1, P2, P3 should all be in a cosine curve.
Further, in the embodiment of the application, after determining the independent variable value corresponding to the maximum function value of the objective cosine function curve in the preset independent variable range, whether the independent variable value is in the deflection angle supportable range of the system can be judged; if the independent variable value is in the range of the deflection angle which can be supported by the system, determining the independent variable value as the optimal sampling line deflection angle; if the independent variable value is not in the deflection angle range which can be supported by the system, respectively determining the difference value between the independent variable value and two boundary values of the deflection angle range which can be supported by the system, and determining the boundary value corresponding to the smaller difference value as the optimal sampling line deflection angle. For example, the system may support a deflection angle range of [ -45, 45] degrees, an optimal sampling deflection angle of 45 degrees if the determined argument value is 60 degrees, and an optimal sampling deflection angle of-45 degrees if the determined argument value is-60 degrees.
Further, the embodiment of the application scans based on the optimal sampling line deflection angle, judges whether the deflection angle redetermination condition is met in the scanning process, and redetermines the optimal sampling line deflection angle if the deflection angle redetermination condition is met. That is, the following steps are re-performed: transmitting ultrasonic waves to a target position through a plurality of sampling lines to obtain a plurality of Doppler echo signals corresponding to the plurality of sampling lines; wherein the deflection angles of the sampling lines are different; determining a plurality of doppler blood flow velocities at the target location based on the plurality of doppler echo signals; an optimal sampling line deflection angle is determined based on the plurality of Doppler blood flow velocities and the plurality of deflection angles.
In one embodiment, a target sample line may be determined based on the optimal sample line deflection angle; transmitting ultrasonic waves through the target sampling line to obtain a target Doppler echo signal corresponding to the target sampling line; generating a Doppler spectrogram based on the target Doppler echo signal; and judging whether a deflection angle redetermination condition is met or not based on the change condition of the Doppler spectrogram.
For example, a first histogram corresponding to the first doppler spectrogram and a second histogram corresponding to the second doppler spectrogram may be determined, then a first luminance average value corresponding to the first histogram and a second luminance average value corresponding to the second histogram may be determined, a luminance difference value between the first luminance average value and the second luminance average value may be determined, whether the luminance difference value is greater than or equal to a preset luminance difference value threshold value may be determined, if yes, it may be determined that a change condition of the doppler spectrogram satisfies a deflection angle redetermination condition, or a luminance ratio between the first luminance average value and the second luminance average value may be determined, and if yes, it may be determined that the change condition of the doppler spectrogram satisfies a deflection angle redetermination condition. The first doppler spectrum graph and the second doppler spectrum graph are doppler spectrum graphs corresponding to two different moments, and the interval between the two moments may be a preset value, for example, 10s.
In another embodiment, a gray-scale ultrasound sectional image may be acquired; and judging whether a deflection angle redetermining condition is met or not based on the change condition of the gray-scale ultrasonic section image.
For example, a third histogram corresponding to the first gray-scale ultrasonic section image and a fourth histogram corresponding to the second gray-scale ultrasonic section image may be determined respectively, then a third luminance average value corresponding to the third histogram and a fourth luminance average value corresponding to the fourth histogram are determined, a luminance difference value between the third luminance average value and the fourth luminance average value is determined, whether the luminance difference value is greater than or equal to a preset luminance difference value threshold is determined, if yes, it is determined that the change condition of the gray-scale ultrasonic section image satisfies the deflection angle redetermining condition, or a luminance ratio between the third luminance average value and the fourth luminance average value is determined, and if yes, it is determined that the change condition of the gray-scale ultrasonic section image satisfies the deflection angle redetermining condition. The first grayscale ultrasound sectional image and the first grayscale ultrasound sectional image may be two acquired adjacent frame images.
It will be appreciated that if the doppler spectrogram or the gray scale ultrasound sectional image changes significantly, the blood flow position or the probe position may change significantly, and the optimal line deflection angle needs to be determined again.
In addition, after the optimal sampling line deflection angle is redetermined, the embodiment of the application can also calculate the difference value between the redetermined optimal sampling line deflection angle and the original optimal sampling line deflection angle; and judging whether the difference value is smaller than a preset threshold value, if so, continuing scanning based on the original optimal sampling line deflection angle, otherwise, re-determining the optimal sampling line deflection angle and scanning based on the sampling line deflection angle determining method in the embodiment. For example, referring to fig. 6, fig. 6 is a schematic diagram showing a specific sample line deflection angle adjustment according to an embodiment of the present application, in which a change in a tangential plane is observed, and a new deflection angle Φ is recalculated new If phi-phi new At the threshold value set by the user, phi is maintained, otherwise, a new deflection angle phi of the system is set new And, it is necessary to confirm phi new Within the scope that the system can support. In other words, the embodiment of the application can continuously evaluate and redetermine the determined optimal sampling line deflection angle until the difference between the optimal sampling line deflection angle and the original optimal sampling line deflection angle is smaller than the preset threshold.
It should be noted that when the redetermined optimal sampling line deflection angle changes less, the sampling line deflection angle may not be reconfigured, so as to avoid frequent changes of the sampling line of the ultrasonic display interface, and influence the user experience.
Therefore, the problem of complicated operation of continuously adjusting the deflection angle of the sampling line in pulse Doppler diagnosis is solved, the sampling line is automatically adjusted by calculating the deflection angle of the sampling line by using a background, a high-quality Doppler spectrum signal is obtained, the measurement range reaches the requirement of being most beneficial to diagnosis, and the diagnosis automation is realized.
Therefore, according to the embodiment of the application, ultrasonic waves are transmitted to the target position through the plurality of sampling lines, so that a plurality of Doppler echo signals corresponding to the plurality of sampling lines are obtained; and determining a plurality of Doppler blood flow speeds at the target position based on the Doppler echo signals, and finally determining an optimal sampling line deflection angle based on the Doppler blood flow speeds and the deflection angles. Therefore, the Doppler blood flow velocities at the target position are obtained through the sampling lines with different deflection angles, then the optimal sampling line deflection angle is determined based on the Doppler blood flow velocities and the deflection angles, the optimal sampling line deflection angle can ensure that the included angle between the sound wave and the blood flow is optimal, so that the quality of Doppler frequency spectrum can be ensured, and a doctor does not need to manually adjust the Doppler frequency spectrum, so that the diagnosis efficiency can be improved.
Referring to fig. 7, an embodiment of the present application discloses a sampling line deflection angle determining apparatus, including:
the Doppler echo signal acquisition module 11 is used for transmitting ultrasonic waves to the target position through a plurality of sampling lines to obtain a plurality of Doppler echo signals corresponding to the plurality of sampling lines; wherein the deflection angles of the sampling lines are different;
a doppler blood flow velocity determination module 12 for determining a plurality of doppler blood flow velocities at the target location based on the plurality of doppler echo signals;
a sample line deflection angle determination module 13, configured to determine an optimal sample line deflection angle based on the plurality of doppler blood flow velocities and the plurality of deflection angles.
Therefore, according to the embodiment of the application, ultrasonic waves are transmitted to the target position through the plurality of sampling lines, so that a plurality of Doppler echo signals corresponding to the plurality of sampling lines are obtained; and determining a plurality of Doppler blood flow speeds at the target position based on the Doppler echo signals, and finally determining an optimal sampling line deflection angle based on the Doppler blood flow speeds and the deflection angles. Therefore, the Doppler blood flow velocities at the target position are obtained through the sampling lines with different deflection angles, then the optimal sampling line deflection angle is determined based on the Doppler blood flow velocities and the deflection angles, the optimal sampling line deflection angle can ensure that the included angle between the sound wave and the blood flow is optimal, so that the quality of Doppler frequency spectrum can be ensured, and a doctor does not need to manually adjust the Doppler frequency spectrum, so that the diagnosis efficiency can be improved.
In one embodiment, the sampling line deflection angle determination module 13 may include:
the independent variable value determining submodule is used for determining an independent variable value corresponding to a maximum function value of the objective cosine function curve in a preset independent variable range based on the Doppler blood flow speeds and the deflection angles; the target cosine function curve takes the deflection angle of a sampling line as an independent variable and Doppler blood flow velocity as a dependent variable;
and the optimal sampling deflection angle determining submodule is used for determining the optimal sampling deflection angle based on the independent variable value.
Further, the independent variable value determining submodule may specifically include:
the formula determining unit is used for constructing a formula of the objective cosine function curve based on the Doppler effect formula;
a calculation equation set determining unit configured to determine a calculation equation set based on a formula of the object cosine function curve, the plurality of doppler blood flow velocities, and the plurality of deflection angles;
and the independent variable value calculating unit is used for calculating the independent variable value corresponding to the maximum function value of the objective cosine function curve in the preset independent variable range by using the calculation equation set.
The optimal sampling deflection angle determining submodule is specifically used for judging whether the independent variable value is in a deflection angle supportable range of the system or not; if the independent variable value is in the range of the deflection angle which can be supported by the system, determining the independent variable value as the optimal sampling line deflection angle; if the independent variable value is not in the deflection angle range which can be supported by the system, respectively determining the difference value between the independent variable value and two boundary values of the deflection angle range which can be supported by the system, and determining the boundary value corresponding to the smaller difference value as the optimal sampling line deflection angle.
Further, the device is further configured to: scanning based on the optimal sampling line deflection angle;
correspondingly, the device also comprises a deflection angle redetermination judging module which is used for judging whether the deflection angle redetermination condition is met or not in the scanning process, and if the deflection angle redetermination condition is met, the device redefines the deflection angle of the optimal sampling line.
In one embodiment, the apparatus is specifically configured to determine a target sampling line based on the optimal sampling line deflection angle; transmitting ultrasonic waves through the target sampling line to obtain a target Doppler echo signal corresponding to the target sampling line; generating a Doppler spectrogram based on the target Doppler echo signal; correspondingly, the deflection angle redetermination judging module is used for judging whether the deflection angle redetermination condition is met or not based on the change condition of the Doppler spectrogram.
In another embodiment, the device is further configured to acquire a gray-scale ultrasound sectional image; correspondingly, the deflection angle redetermination judging module is specifically configured to judge whether a deflection angle redetermination condition is satisfied based on a change condition of the gray-scale ultrasonic tangent plane image.
Further, the device further comprises:
the difference value calculating module is used for calculating the difference value between the redetermined optimal sampling line deflection angle and the original optimal sampling line deflection angle after the device redetermines the optimal sampling line deflection angle;
and the threshold judging module is used for judging whether the difference value is smaller than a preset threshold, if so, the device continues scanning based on the original optimal sampling line deflection angle, and otherwise, the device scans based on the redetermined optimal sampling line deflection angle.
Referring to fig. 8, an embodiment of the present application discloses an ultrasound apparatus 20 including a processor 21 and a memory 22; wherein the memory 22 is used for storing a computer program; the processor 21 is configured to execute the computer program, and the method for determining a sampling line deflection angle is disclosed in the foregoing embodiment.
For the specific process of the above-mentioned sampling line deflection angle determining method, reference may be made to the corresponding content disclosed in the foregoing embodiment, and no further description is given here.
The memory 22 may be a carrier for storing resources, such as a read-only memory, a random access memory, a magnetic disk or an optical disk, and the storage mode may be transient storage or permanent storage.
In addition, the ultrasonic device 20 further includes a power supply 23, a communication interface 24, an input-output interface 25, and a communication bus 26; wherein the power supply 23 is used for providing working voltage for each hardware device on the ultrasonic device 20; the communication interface 24 can create a data transmission channel between the ultrasonic device 20 and an external device, and the communication protocol to be followed is any communication protocol applicable to the technical solution of the present application, which is not specifically limited herein; the input/output interface 25 is used for acquiring external input data or outputting external output data, and the specific interface type thereof may be selected according to the specific application requirement, which is not limited herein.
Further, the embodiment of the application also discloses a computer readable storage medium for storing a computer program, wherein the computer program is executed by a processor to realize the method for determining the deflection angle of the sampling line disclosed in the previous embodiment.
For the specific process of the above-mentioned sampling line deflection angle determining method, reference may be made to the corresponding content disclosed in the foregoing embodiment, and no further description is given here.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above detailed description of a method, device, apparatus and medium for determining a deflection angle of a sampling line, provided by the present application, applies specific examples herein to illustrate the principles and embodiments of the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (11)
1. A sampling line deflection angle determination method, characterized by comprising:
transmitting ultrasonic waves to a target position through a plurality of sampling lines to obtain a plurality of Doppler echo signals corresponding to the plurality of sampling lines; wherein the deflection angles of the sampling lines are different;
determining a plurality of doppler blood flow velocities at the target location based on the plurality of doppler echo signals;
an optimal sampling line deflection angle is determined based on the plurality of Doppler blood flow velocities and the plurality of deflection angles.
2. The sample line deflection angle determination method according to claim 1, wherein the determining an optimal sample line deflection angle based on the plurality of doppler blood flow velocities and a plurality of the deflection angles comprises:
determining an independent variable value corresponding to a maximum function value of a target cosine function curve in a preset independent variable range based on the Doppler blood flow speeds and the deflection angles; the target cosine function curve takes the deflection angle of a sampling line as an independent variable and Doppler blood flow velocity as a dependent variable;
and determining an optimal sampling deflection angle based on the independent variable value.
3. The method for determining a deflection angle of a sampling line according to claim 2, wherein determining an argument value corresponding to a maximum function value of an objective cosine function curve within a preset argument range based on the plurality of doppler blood flow velocities and the plurality of deflection angles comprises:
constructing a formula of a target cosine function curve based on a Doppler effect formula;
determining a set of calculation equations based on the formula of the object cosine function curve, the plurality of Doppler blood flow velocities, and the plurality of deflection angles;
and calculating the self-variable value corresponding to the maximum function value of the objective cosine function curve in the preset independent variable range by using the calculation equation set.
4. The sampling line deflection angle determination method according to claim 2, wherein the determining an optimal sampling deflection angle based on the argument value comprises:
judging whether the independent variable value is in a deflection angle range supported by a system or not;
if the independent variable value is in the range of the deflection angle which can be supported by the system, determining the independent variable value as the optimal sampling line deflection angle;
if the independent variable value is not in the deflection angle range which can be supported by the system, respectively determining the difference value between the independent variable value and two boundary values of the deflection angle range which can be supported by the system, and determining the boundary value corresponding to the smaller difference value as the optimal sampling line deflection angle.
5. The sampling line deflection angle determination method according to any one of claims 1 to 4, further comprising:
and scanning based on the optimal sampling line deflection angle, judging whether a deflection angle redetermination condition is met in the scanning process, and redefining the optimal sampling line deflection angle if the deflection angle redetermination condition is met.
6. The method according to claim 5, wherein the scanning based on the optimal sampling line deflection angle and determining whether a deflection angle redetermining condition is satisfied during the scanning, comprises:
determining a target sampling line based on the optimal sampling line deflection angle;
transmitting ultrasonic waves through the target sampling line to obtain a target Doppler echo signal corresponding to the target sampling line;
generating a Doppler spectrogram based on the target Doppler echo signal;
and judging whether a deflection angle redetermination condition is met or not based on the change condition of the Doppler spectrogram.
7. The sample line deflection angle determination method according to claim 5, wherein the judging whether the deflection angle redetermination condition is satisfied comprises:
acquiring a gray-scale ultrasonic section image;
and judging whether a deflection angle redetermining condition is met or not based on the change condition of the gray-scale ultrasonic section image.
8. The sample line deflection angle determination method according to claim 5, further comprising, after the redetermining the optimal sample line deflection angle:
calculating a difference value between the redetermined optimal sampling line deflection angle and the original optimal sampling line deflection angle;
and judging whether the difference value is smaller than a preset threshold value, if so, continuing scanning based on the original optimal sampling line deflection angle, otherwise, scanning based on the redetermined optimal sampling line deflection angle.
9. A sampling line deflection angle determining apparatus, comprising:
the Doppler echo signal acquisition module is used for transmitting ultrasonic waves to the target position through a plurality of sampling lines to obtain a plurality of Doppler echo signals corresponding to the plurality of sampling lines; wherein the deflection angles of the sampling lines are different;
a doppler blood flow velocity determination module for determining a plurality of doppler blood flow velocities at the target location based on the plurality of doppler echo signals;
and the sampling line deflection angle determining module is used for determining an optimal sampling line deflection angle based on the Doppler blood flow speeds and the deflection angles.
10. An ultrasound device comprising a processor and a memory; wherein,
the memory is used for storing a computer program;
the processor for executing the computer program to implement the sample line deflection angle determination method according to any one of claims 1 to 8.
11. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the sample line deflection angle determination method according to any one of claims 1 to 8.
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| CN202210622257.5A CN117204883A (en) | 2022-06-02 | 2022-06-02 | Sampling line deflection angle determining method, device, equipment and medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210622257.5A CN117204883A (en) | 2022-06-02 | 2022-06-02 | Sampling line deflection angle determining method, device, equipment and medium |
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| CN117204883A true CN117204883A (en) | 2023-12-12 |
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