A gear selection method and assembly, an ultrasonic scanning method and assembly

Abstract

The application discloses a gear selection method and component, and an ultrasonic scanning method and component. After the depth position of a measured object is determined, the measured object is subjected to PW scanning by selecting a scanning gear value matched with the depth position, and echo signals collected in the PW scanning process are detected, so that the receiving time of interference signals in the echo signals obtained by the PW scanning is added to the time blind area of the HPRF mode at the depth position, thereby updating the inherent time blind area in the HPRF mode to obtain a new time blind area set, then the new time blind area set is used to select an effective gear in the HPRF mode from a preset gear list, so that the finally screened PRF gear is neither in the inherent time blind area in the HPRF mode nor has many interference echoes, thereby improving the quality of the echo signals and the imaging precision. Correspondingly, the gear selection component, the ultrasonic scanning method and the component also have the above technical effects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of computer, in particular to a gear selection method and component, an ultrasonic scanning method and component. BACKGROUND

[0002] At present, in the high pulse repetition frequency (HPRF) mode of the ultrasonic diagnosis system, the pulse signals are continuously transmitted according to the predetermined time interval, so that the ultrasonic probe may receive the echo signals at each time stage. However, there is a time blind area in the mode which is not suitable for receiving the echo signals.

[0003] At present, in order to avoid the reception of the echo signals in the time blind area, the pulse repetition frequency gears can be screened, and the scanning is performed at the screened gears.

[0004] However, the pulse repetition frequency gears (PRF gears) screened based on the above-mentioned time blind area cannot well guarantee the quality of the echo signals. Because in the HPRF mode, the ultrasonic probe may simultaneously receive the echo reflected by the actual object to be detected and the echo reflected by the interference object, and the echo reflected by the interference object still affects the quality of the echo signals. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a gear selection method and component, an ultrasonic scanning method and component, so as to select the effective gears which can reduce the interference signals. The specific scheme is as follows:

[0006] To achieve the above-mentioned purpose, on one hand, the present application provides a gear selection method applied to an ultrasonic device, comprising:

[0007] If it is determined that the measured object is located at a depth position, a scanning gear value matched with the depth position is selected to perform the PW scanning on the measured object;

[0008] The interference signals in the echo signals collected in the PW scanning process are detected, and the receiving time of the interference signals is added to the time blind area of the HPRF mode at the depth position to obtain a time blind area set;

[0009] The effective gears of the HPRF mode are selected from a preset gear list by using the time blind area set.

[0010] Preferably, the selection of the scanning gear value matched with the depth position comprises:

[0011] The scanning limit value corresponding to the depth position is calculated;

[0012] Among the gear values corresponding to the preset gear list, a gear value not greater than the scanning limit value is selected as the scanning gear value.

[0013] Preferably, the selecting, among the gear values corresponding to the preset gear list, a gear value not greater than the scanning limit value as the scanning gear value comprises:

[0014] Among the gear values, a maximum gear value not greater than the scanning limit value is selected as the scanning gear value.

[0015] Preferably, the selecting, among the gear values corresponding to the preset gear list, a gear value not greater than the scanning limit value as the scanning gear value comprises:

[0016] Among the gear values, a gear value not greater than the scanning limit value is randomly selected as the scanning gear value.

[0017] Preferably, the interference signal in the echo signal collected in the PW scanning process comprises:

[0018] The echo reflected by each preset detection point in the echo signal is subjected to frequency domain analysis, and if the spectral energy mean of any echo exceeds a first threshold value, the echo is determined as an interference signal.

[0019] Preferably, the interference signal in the echo signal collected in the PW scanning process comprises:

[0020] The echo reflected by each preset detection point in the echo signal is subjected to time domain analysis, and if the time domain standard deviation of any echo exceeds a second threshold value, the echo is determined as an interference signal.

[0021] Preferably, the adding the reception time of the interference signal to the time blind zone of the HPRF mode at the depth position to obtain a time blind zone set comprises:

[0022] The inherent time blind zone of the HPRF mode at the depth position is obtained based on a parameter preparation stage and a transmission excitation stage;

[0023] The reception time of the interference signal is added to the inherent time blind zone to obtain a time blind zone set.

[0024] Preferably, the selecting, in a preset gear list, an effective gear under the HPRF mode by using the time blind zone set comprises:

[0025] It is judged whether each gear value corresponding to the preset gear list is covered by the time blind zone set or not;

[0026] The PRF gear corresponding to the gear value not covered by the time blind zone set is determined as the effective gear.

[0027] Preferably, the determining whether each gear value corresponding to the preset gear list is covered by the time blind zone set comprises:

[0028] determining a time of echo reception of the ultrasonic wave transmitted to the depth position;

[0029] for each gear value, calculating a remainder of the time of echo reception divided by any gear value;

[0030] if the remainder falls within the time blind zone set, determining that the gear value is covered by the time blind zone set; otherwise, determining that the gear value is not covered by the time blind zone set.

[0031] In another aspect, the application further provides a gear selection device applied to an ultrasonic device, comprising:

[0032] a PW scanning module configured to select a scanning gear value matched with the depth position to perform PW scanning on the measured object if it is determined that the measured object is located at the depth position;

[0033] a time blind zone updating module configured to detect an interference signal in the echo signal collected in the PW scanning process, and add a time of reception of the interference signal to a time blind zone of the HPRF mode at the depth position to obtain a time blind zone set;

[0034] a selection module configured to select an effective gear in the HPRF mode from a preset gear list by using the time blind zone set.

[0035] In another aspect, the application further provides an ultrasonic scanning method applied to an ultrasonic device, comprising:

[0036] after selecting an effective gear in the HPRF mode according to the method described in any of the above, performing ultrasonic scanning based on the selected gear.

[0037] In another aspect, the application further provides an electronic device, comprising a processor and a memory; wherein the memory is configured to store a computer program, the computer program is loaded and executed by the processor to implement the gear selection method described above.

[0038] In another aspect, the application further provides a storage medium, wherein the storage medium stores computer executable instructions, and the computer executable instructions are loaded and executed by a processor to implement the gear selection method described above.

[0039] In yet another aspect, the present application also provides an electronic device, comprising a processor and a memory; wherein the memory is configured to store a computer program, which is loaded and executed by the processor to implement the aforementioned ultrasonic scanning method.

[0040] In yet another aspect, the present application also provides a storage medium, in which computer executable instructions are stored, which are loaded and executed by a processor to implement the aforementioned ultrasonic scanning method.

[0041] After determining the depth position of the measured object, the present application selects the scanning gear value matched with the depth position to perform PW scanning on the measured object, and detects the echo signals collected in the PW scanning process, so as to add the receiving time of the interference signals in the PW scanning echo signals to the time blind area of the HPRF mode at the depth position, thereby updating the inherent time blind area in the HPRF mode, obtaining a new time blind area set, and then selecting the effective gear of the HPRF mode in the preset gear list by using the new time blind area set. Not only the inherent time blind area (such as the parameter preparation stage and the transmission excitation stage) in the HPRF mode can be avoided, but also the PRF gear with serious interference signals in the echo receiving stage can be avoided, and a more effective PRF gear is selected, so that the echo receiving quality is good and the interference signals are few when the HPRF mode scanning is performed at the finally selected PRF gear, thereby improving the quality of the echo signals and the imaging precision.

[0042] Correspondingly, the gear selection component (the component comprises a device, an equipment and a storage medium), the ultrasonic scanning method and the component (the component comprises a device, an equipment and a storage medium) provided by the present application also have the above technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0044] Figure 1 A gear selection method flowchart provided by the present application;

[0045] Figure 2 An imaging schematic diagram for blood flow velocity calculation of blood vessels provided by the present application;

[0046] Figure 3 A schematic diagram of a time blind area set provided by the present application;

[0047] Figure 4 A blood flow or tissue maximum moving speed calculation diagram provided by the present application;

[0048] Figure 5 A PW mode and HPRF mode comparison diagram provided by the present application;

[0049] Figure 6 A HPRF mode scanning method flow chart provided by the present application;

[0050] Figure 7 A gear selection device diagram provided by the present application;

[0051] Figure 8 A server structure diagram provided by the present application;

[0052] Figure 9 A terminal structure diagram provided by the present application. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application. In addition, in the embodiments of the present application, "first", "second", etc. are used to distinguish similar objects, and do not necessarily mean a specific order or sequence.

[0054] The existing PRF gear selection scheme for HPRF mode cannot well guarantee the quality of echo signals. Because in the HPRF mode, the ultrasonic probe may simultaneously receive echoes reflected by the actual object under examination and echoes reflected by interference objects, and the echoes reflected by the interference objects still affect the quality of the echo signals.

[0055] In view of the above problems existing at present, the present application proposes a gear selection scheme, which can make the finally screened PRF gear neither in the inherent time blind area of the HPRF mode nor have too many interference echoes, thereby improving the quality of echo signals and imaging accuracy.

[0056] Please refer to Figure 1 , Figure 1 A gear selection method flow chart provided by the embodiments of the present application. As shown in the figure, Figure 1 the gear selection method applied to an ultrasonic device can include the following steps:

[0057] S101, if it is determined that the measured object is located at a depth position, a scanning gear value matched with the depth position is selected to perform a pulse wave (PW) scan on the measured object.

[0058] When a Doppler imaging (i.e., pulse Doppler imaging) is performed on a measured object (e.g., a blood vessel, a human tissue, etc.) by using an ultrasound device, the ultrasound device can instantly measure a depth position of the measured object, and a user can see the measured object on a display screen of the ultrasound device. The Doppler imaging is a technique for detecting motion information of blood flow or tissue, and the principle thereof is to calculate a motion speed of the blood flow or tissue according to a Doppler shift value of a detected echo.

[0059] Referring to FIG. 1, Figure 2 a blood vessel located at a Depth1 depth position is a measured object, the measured object reflects a pulse emitted by an ultrasound probe for the ultrasound probe to receive, and a real sampling box is marked at the position of the measured object; a virtual sampling box located at a Depth2 depth position is on the same sampling line as the real sampling box, and a blood vessel or tissue at the virtual sampling box also reflects the pulse emitted by the ultrasound probe. Of course, Figure 2 there can be other virtual sampling boxes on the sampling line shown in FIG. 1.

[0060] As can be seen, echoes corresponding to the real sampling box and the virtual sampling box are both received by the ultrasound probe, but since the blood vessel or tissue at the virtual sampling box is not the measured object, the echo corresponding to the virtual sampling box affects the echo corresponding to the real sampling box, that is, the echo corresponding to the virtual sampling box is an interference signal of the echo corresponding to the real sampling box, and it affects the imaging quality of the echo of the real sampling box. In order to improve the imaging quality, it is necessary to eliminate the echo corresponding to the virtual sampling box as much as possible.

[0061] To this end, the embodiment first performs a PW scan on the measured object to detect the echo of the virtual sampling box, so as to avoid using a PRF gear that produces the echo in an HPRF mode, thereby reducing the echo of the virtual sampling box. The PRF (i.e., pulse repetition frequency) is the number of pulses emitted per second, which is the inverse of the pulse repetition interval. The PRF gear refers to a selectable interval corresponding to the pulse repetition frequency.

[0062] S102, detecting an interference signal in an echo signal collected in a PW scan process, and adding a receiving time of the interference signal to a time blind area of the HPRF mode at the depth position to obtain a time blind area set.

[0063] In the embodiment, the way of detecting the echo of the virtual sampling box includes: performing a frequency domain analysis and / or a time domain analysis on the echo signal collected in the PW scan process, so as to determine a signal with higher spectral energy and / or higher time domain standard deviation, and determine such a signal as the echo of the virtual sampling box (i.e., the interference signal).

[0064] Therefore, in one embodiment, detecting the interference signal in the echo signal collected in the PW scanning process comprises: performing frequency domain analysis on the echo reflected by each preset detection point in the echo signal, and if the average spectral energy of any echo exceeds a first threshold, the echo is determined as the interference signal; and / or performing time domain analysis on the echo reflected by each preset detection point in the echo signal, and if the time domain standard deviation of any echo exceeds a second threshold, the echo is determined as the interference signal.

[0065] Each preset detection point corresponds to the position of each virtual sampling frame on the same sampling line extending from the contact surface of the ultrasonic probe to the depth position of the measured object. The total number of detection points on the sampling line is preset, such as P. The total number of sampling lines is also preset. If the number of sampling lines is preset as N and the number of detection points on each sampling line is P, during the PW scanning, the ultrasonic probe transmits a pulse signal once, and N×P echoes can be received. Any echo signal can be expressed by the formula: Wherein, u(t) is any echo signal, A is the amplitude of the echo, f C is the transmission pulse frequency, f d is the Doppler shift value, is the phase change value.

[0066] For the N×P echoes, each echo can be analyzed in the frequency domain and / or the time domain to detect the interference signal therein. The detection point corresponding to the echo detected as the interference signal can be referred to as an invalid detection point, and the depth at which the invalid detection point is located is the invalid depth, at which the virtual sampling frame can not be marked, thereby reducing the number of virtual sampling frames and the interference of the virtual sampling frames on the real sampling frames. The present embodiment does not aim to separate the echoes corresponding to the virtual sampling frames and the real sampling frames, but directly discards the PRF range with the interference signal in the echo receiving stage.

[0067] The way of discarding the PRF range with the interference signal in the echo receiving stage in the present embodiment is: after detecting the interference signal, the receiving time of the interference signal is added to the time blind area of the HPRF mode at the depth position, thereby obtaining a new time blind area set, and the effective range of the HPRF mode is selected in the preset range list using the time blind area set, so as to avoid using the PRF range that produces the interference signal in the HPRF mode.

[0068] The time blind zone of the HPRF mode at the depth position of the measured object is: the inherent time blind zone of the HPRF mode at the depth position, in which the ultrasonic probe should avoid receiving echo signals. In order to let the ultrasonic probe not receive echo signals in the time blind zone, a PRF gear in which echo time is not in the above time blind zone can be selected from preset multiple PRF gears of the ultrasonic device, and the HPRF mode is scanned with the selected PRF gear.

[0069] Generally, the time blind zone of the HPRF mode at the depth position of the measured object specifically includes: a parameter preparation stage and a transmission excitation stage. The parameter preparation stage is used for preparing transmission and reception parameters required by the ultrasonic diagnostic system, and the transmission excitation stage generates transmission sound waves to irradiate the object to be detected by the ultrasonic transducer (provided in the ultrasonic probe), so that the two stages are not suitable for receiving echo signals, or the received echo signals are unstable and will be disturbed by the transmission pulse, and are not suitable for detection and imaging. Therefore, the two are defined as the time blind zone in the HPRF mode. If the calculated echo receiving time is located in the time blind zone under a certain scanning PRF value of the HPRF mode, the scanning PRF value is invalid, and the corresponding PRF gear cannot be used.

[0070] S103, selecting an effective gear in the HPRF mode in the preset gear list by using the time blind zone set.

[0071] In the embodiment, not only the parameter preparation stage and the transmission excitation stage are considered, but also whether the echo receiving stage receives interference signals. Accordingly, the new time blind zone set in the HPRF mode can be seen from Figure 3 In Figure 3 , the time interval of adjacent two transmissions is 1 / PRF, and there is a parameter preparation stage and a transmission excitation stage for each transmission, so that there is a time blind zone for each transmission. At the same time, after each transmission, there is a possibility of receiving echo signals with interference signals, so that there is a blind zone A (i.e. the time of receiving interference signals) after each transmission. Accordingly, the PRF gear in which the echo receiving time is located in the new time blind zone set cannot be used, that is, the PRF gear in which interference signals exist in the echo receiving stage and the PRF gear in which the echo receiving time conflicts with the parameter preparation stage and the transmission excitation stage are discarded.

[0072] In one embodiment, the time blind zone set is obtained by adding the time of receiving the interference signal to the time blind zone of the HPRF mode at the depth position, comprising: obtaining the inherent time blind zone of the HPRF mode at the depth position based on the parameter preparation stage and the transmission excitation stage; and adding the time of receiving the interference signal to the inherent time blind zone to obtain the time blind zone set. The adding the time of receiving the interference signal to the inherent time blind zone to obtain the time blind zone set can be: forming a time set by the time of receiving the interference signal and the time in the inherent time blind zone to obtain the time blind zone set.

[0073] It can be seen that in the embodiment, the new time blind zone set not only includes the parameter preparation stage and the transmission excitation stage listed above, but also includes the time of receiving the interference signal in the echo receiving stage determined above. Therefore, the new time blind zone set is used to select the effective PRF in the HPRF mode in the preset gear list, which can not only avoid the inherent time blind zone (such as the parameter preparation stage and the transmission excitation stage) in the HPRF mode, but also avoid using the PRF gear that produces the interference signal, so that a more effective PRF gear is selected for HPRF mode scanning, the quality of the echo signal is improved, and the imaging accuracy is also improved.

[0074] Based on the above embodiment, it should be noted that a suitable PRF value is needed when performing PW scanning on the measured object. How to select a suitable PRF value for PW scanning? Based on the current depth position of the measured object.

[0075] Generally, considering that the round trip of the pulse signal transmitted by the ultrasonic probe needs a certain time, when the depth position of the measured object is known, the scanning limit value corresponding to the current depth position is: PRF Limit =C / Depth SampleGate / 2. Wherein, PRF limit is the maximum PRF value available for detecting the depth position Depth sampleGate of the measured object, and the current depth position is Depth SampleGate . Correspondingly, when the PRF value used for scanning is known, the maximum detectable depth is: Depth PRF =C / PRF / 2. Wherein, C is the signal transmission speed, and Depth PRF is the PRF value used for scanning. It can be seen that the detectable depth is related to the PRF value used for scanning. That is, the maximum depth that can be detected by one pulse signal is half of the distance traveled by the pulse signal in the propagation time.

[0076] It should be noted that a plurality of PRF gears are preset in the ultrasound device, for example, 30 PRF gears are provided, and the gear values of each gear are 1, 2, 3, …, 30 respectively. Of course, the gear settings of different ultrasound devices may be different, but the purpose is to let the user select the appropriate PRF gear for ultrasound scanning.

[0077] Therefore, after calculating the maximum available PRF value of the depth position of the measured object, the gear value not greater than the scanning limit value can be selected from each gear value for PW scanning. Of course, if the ultrasound device supports user manual setting of the PRF scanning value, the scanning limit value calculated can also be directly used for PW scanning, so that a larger blood flow rate can be detected.

[0078] Then in an embodiment, selecting the scanning gear value matching the depth position comprises: calculating a scanning limit value corresponding to the depth position; and selecting a gear value not greater than the scanning limit value from each gear value corresponding to the preset gear list as the scanning gear value. Wherein, selecting a gear value not greater than the scanning limit value from each gear value corresponding to the preset gear list as the scanning gear value comprises: selecting the maximum gear value not greater than the scanning limit value from each gear value as the scanning gear value, so as to select a PRF value capable of detecting a larger movement speed; or randomly selecting a gear value not greater than the scanning limit value from each gear value as the scanning gear value.

[0079] Wherein, the closer the selected gear value is to the scanning limit value, the greater the movement speed of the blood flow or tissue that can be detected. For details, please refer to Figure 4 , when the PRF value is known, the maximum movement speed of the blood flow or tissue that can be detected is:

[0080]

[0081] Wherein, C is the sound wave transmission speed, PRF is the known PRF value, θ is the included angle between the sampling line and the movement direction of the measured object, f C is the transmission pulse frequency. It can be seen from the formula that the greater the PRF value, the greater the maximum movement speed that can be detected.

[0082] Wherein, the above formula is determined based on the Nyquist sampling theorem and the relationship between the Doppler shift and the object movement speed.

[0083] Specifically, the relationship between the Doppler shift and the object movement speed is expressed by the formula:

[0084]

[0085] Wherein, C is the sound wave transmission speed, f Cfor the transmit pulse frequency, θ is the angle between the sampling line and the movement direction of the particle (red blood cell or tissue cell) to be detected, v is the movement speed of the particle to be detected, f d for the Doppler shift value.

[0086] Again, based on the Nyquist sampling theorem: the sampling frequency must be greater than or equal to twice the signal frequency to correctly sample the signal. For the PW scanning mode, the sampling frequency is the PRF, and the Doppler shift value of the signal that can be correctly detected is not greater than PRF / 2, that is:

[0087]

[0088] It can be seen that, by substituting into , we can obtain

[0089] Again, since Depth PRF =C / PRF / 2, it can be known that the PW scanning has the following limitations: the greater the PRF value, the smaller the distance that can be detected, but the greater the movement speed of the blood flow or tissue that can be detected. Therefore, when the flow speed of a certain blood vessel position is greater than v max , the depth of the blood vessel position is greater than Depth PRF , the PW mode will not work normally. That is, the PW mode cannot correctly detect the movement information of an object with a large depth and a large flow speed. Because of this limitation of the PW scanning, the HPRF mode is provided in the ultrasound device. The HPRF mode repeatedly transmits pulses at a higher PRF interval, which is a prerequisite for detecting higher flow speed objects.

[0090] Under normal circumstances, the PW mode and the HPRF mode are provided in the ultrasound device, and both modes can perform Doppler imaging. The PW mode follows the restriction of transmitting once and receiving once, the adjacent two transmitted pulses do not affect each other, and the time interval between the adjacent two transmissions is the reciprocal of the PRF, but the flow speed of the object that can be detected has certain limitations. The HPRF mode no longer follows the restriction of transmitting once and receiving once, but continuously transmits pulse signals at a predetermined time interval to detect higher flow speed objects.

[0091] Please refer to Figure 5 , according to the PW mode, the PRF1 is transmitted to the position with a depth of Depth1 for the first time, and the receiving time of the corresponding PW target echo is: 2*Depth1 / C. After receiving the PW target echo, the ultrasound probe transmits the second pulse signal. The time interval between the first transmission and the second transmission is 1 / PRF1, and 2*Depth1 / C is definitely earlier than 1 / PRF1.

[0092] Please refer to Figure 5, the receiving time of the corresponding HPRF target echo is 2*Depth1 / C. According to the second time of transmitting PRF2 to the position of Depth2 in the HPRF mode, the receiving time of the corresponding HPRF target echo is 2*Depth2 / C. The time interval between the first time of transmitting and the second time of transmitting is 1 / PRF2, and 2*Depth1 / C can be later than 1 / PRF2. That is, before the echo of the first time is received, the second pulse has been transmitted, and the echoes of the pulses transmitted at the two different depths of Depth1 and Depth2 can be received at the same time. That is, in the HPRF mode, the ultrasonic probe can receive the echoes reflected by the actual object and the echoes reflected by the interference object at the same time.

[0093] Specifically, in combination with Figure 2 and Figure 5 , it is assumed that the pulse transmitted to Depth1 in the HPRF mode is PRF2 transmitted at time 0, and the transmission time interval is 1 / PRF2. Then, according to the sound wave propagation speed and the depth position of the measured blood vessel, it can be known that the echo caused by the first pulse needs to be received by the probe in 2*Depth1 / C time.

[0094] In addition, in the HPRF mode, 1 / PRF2 can be less than 2*Depth1 / C, so at 2*Depth1 / C, the probe can receive the reflection echo caused by the second pulse at the depth of Depth2 in addition to the reflection echo caused by the first pulse at the depth of Depth1. That is, the reflection echoes at the two positions are received by the probe at the same time. The reflection echo at the depth of Depth2 is an interference signal to the reflection echo at the depth of Depth1 to be detected. Therefore, in the HPRF mode, a virtual sampling frame is generally drawn at the depth of Depth2, and this way is used to tell the user that the HPRF echo will be mixed with the interference echo at the position of the virtual sampling frame.

[0095] As described above, in order to reduce the interference of the interference echo, the measured object is first subjected to PW scanning to detect the virtual sampling frame echo, so that the PRF gear that can produce the echo is avoided in the HPRF mode, and thus the interference echo can be reduced.

[0096] Based on the above embodiments, it is necessary to explain that the method abandoned by the application is that the PRF position of the echo receiving stage exists interference signal and the PRF position of the echo receiving time and the parameter preparation stage, the transmission excitation stage conflict is: judging whether the echo receiving time corresponding to each position value of the preset position list falls into the new time blind area set, if yes, the PRF position corresponding to the position value is abandoned; otherwise, the PRF position corresponding to the position value is retained as an effective position.

[0097] In an embodiment, the effective position in the HPRF mode is selected in the preset position list by using the time blind area set, comprising: judging whether each position value corresponding to the preset position list is covered by the time blind area set respectively; the PRF position corresponding to the position value not covered by the time blind area set is determined as an effective position.

[0098] In an embodiment, judging whether each position value corresponding to the preset position list is covered by the time blind area set respectively, comprising: determining the echo receiving time of the ultrasonic wave transmitted to the depth position; for each position value, calculating the remainder of the echo receiving time divided by any position value; if the remainder falls into the time blind area set, it is determined that the position value is covered by the time blind area set; otherwise, it is determined that the position value is not covered by the time blind area set.

[0099] It is necessary to explain that after the depth position of the measured object is known, the parameter preparation stage, the transmission excitation stage and the echo receiving time can be calculated, so the time blind area set is also calculated.

[0100] Combining Figure 3 It is shown that the starting time of the scanning line is defined as 0 time, the blind area time range is [0, T Blind ] (that is, the time blind area set), and the transmission starting time is set as T Tx , then the echo receiving time of the depth of Depth is T Tx +Depth / C*2, considering that the time scale is the range [0, 1 / PRF] when transmitting at an interval of 1 / PRF, then for any position value, the quantized N PRF needs to satisfy N Blind ≤mod(N Gate ,N PRF )≤N PRF , only in this way, the new time blind area set can be avoided. Wherein, mod is the remainder function, N Gate is the echo receiving time corresponding to the current depth Depth.

[0101] Generally, based on the quantization clock Fs, the above time values are quantized into unified values, then the parameter corresponding relationship after quantization is: N Blind =round(T Blind *Fs); N Gate= round((T Tx + Depth / C*2)*Fs); N PRF = round(Fs / PRF).

[0102] For example, assume that in an ultrasonic diagnostic system, the quantization clock Fs is 40MHz, the sound speed C is 1540m / s, the blind zone N Blind is [0, 1100] (i.e. the time blind zone set), the transmission starting time is 10us, the real sampling frame depth is 160mm, and the PRF positions in the system are 1KHz, 2KHz, 4KHz, 6KHz, 8KHz, 10KHz, 12KHz, 14KHz, and 16KHz.

[0103] Accordingly, N Gate = 8712 can be calculated, and the judgment results of whether the above PRF positions are valid are shown in Table 1.

[0104] Table 1

[0105]

[0106]

[0107] It can be seen that the PRF positions with interfering signals and the PRF positions with echo receiving time conflicting with the parameter preparation stage and the transmission excitation stage can be eliminated from the PRF positions, so that more effective PRF positions can be selected for HPRF mode scanning, and the precision of echo signals can be improved.

[0108] Based on the above embodiment, the new time blind zone set is defined, and the PRF positions are screened based on the new time blind zone set, so that the PRF positions that can improve the signal-to-noise ratio can be eliminated, and the purpose of improving the display quality of the HPRF spectrum is achieved. The specific implementation process of each step in the embodiment can refer to the corresponding content disclosed in the foregoing embodiment.

[0109] Specifically, the new time blind zone set defined in the application can be represented by the formula or B represents the time blind zone set, which includes the receiving time of the interfering signal in the parameter preparation stage, the transmission stage, and the echo receiving stage (i.e. the time corresponding to the blind zone A in Figure 3 ).

[0110] The embodiment provides a scanning method of HPRF mode, which first determines the blind zone A by PW scanning, then combines the blind zone A with the inherent blind zone in the HPRF mode, then selects the positions by using the new blind zone (i.e. the new time blind zone set) obtained by the combination, and performs HPRF mode scanning.

[0111] Please refer toFigure 6 The specific process includes:

[0112] Step 1: According to the depth of the actual sampling frame under the current HPRF mode, the maximum available PRF value that meets the PW limit under the current depth is calculated, and the calculation formula is: PRF Limit = C / Depth SampleGate / 2.

[0113] Step 2: In each PRF gear in the current ultrasonic diagnostic system, the maximum gear value not greater than PRF Limit is selected for PW scanning, and the corresponding echo data is collected.

[0114] Among them, each gear value in the current ultrasonic diagnostic system can be represented as an array PRFList, which includes the gear values corresponding to all PRF gears. The user can select a suitable gear value in the PRFList.

[0115] Step 3: For the above obtained echo data, the echo reflected by each preset detection point is detected, the signal characteristics are analyzed, and it is judged whether there is large interference information. If it is judged that there is large interference information, the detection point is recorded as an invalid depth, and the echo receiving time of the detection point is recorded.

[0116] Among them, the method of judging whether there is large interference information is:

[0117] (1) FFT (Fast Fourier Transform) is used for frequency spectrum analysis. If the echo reflected by the detection point has obvious frequency characteristics, such as the spectral energy mean exceeding a certain threshold, it is determined that the echo reflected by the detection point has large interference information.

[0118] (2) Time domain standard deviation analysis is used. If the standard deviation of the signal is greater than a certain threshold, it is determined that the echo reflected by the detection point has large interference information.

[0119] Step 4: Merge each echo receiving time recorded in step 3 with the inherent blind area under the HPRF mode to obtain a new time blind area set.

[0120] Step 5: Enter the HPRF mode, filter out the effective gears in each PRF gear in the current ultrasonic diagnostic system according to the new time blind area set obtained in step 4, and perform HPRF scanning and imaging with the selected effective gears.

[0121] The embodiment first detects Doppler shift information of each position point (i.e. detection point) in the real sampling frame in the sampling line based on the conventional PW mode, judges whether each position point has interference signals according to a threshold value, supplements the echo receiving time of the position point determined to have interference signals to the blind area range, further limits the selectable PRF gear in the HPRF mode, eliminates the PRF gear with obvious interference, and enables the selected effective gear to obtain less interference information, higher spectrum quality and better display effect when performing HPRF mode scanning.

[0122] It can be seen that the embodiment does not aim to remove interference information, but directly eliminates the PRF gear that will generate interference information to reduce the influence of the echo of the position point corresponding to the virtual sampling frame on the echo of the real sampling frame in the HPRF mode, thereby improving the HPRF image performance.

[0123] In an embodiment, a gear selection method can be provided, which is applied to an ultrasonic device of a medical institution, a scientific research institution or the like. The ultrasonic device includes a probe, a host and a display. The control terminal can be a panel specially used for controlling the ultrasonic device, or a mobile phone, a tablet or the like used by a doctor.

[0124] The specific gear selection process can include:

[0125] Step 1: The doctor makes the ultrasonic device enter the PW scanning mode through the control terminal, holds the probe to scan the measured object, and displays the scanning image on the display.

[0126] Step 2: After the host of the ultrasonic device determines the depth position of the measured object, a scanning gear value matched with the depth position is selected to perform PW scanning on the measured object.

[0127] Step 3: The host of the ultrasonic device detects interference signals in the collected echo signals in the PW scanning process, adds the receiving time of the interference signals to the time blind area of the HPRF mode at the depth position, and obtains a time blind area set.

[0128] Step 4: The doctor makes the ultrasonic device enter the HPRF mode through the control terminal, continues to hold the probe to scan the measured object, the host of the ultrasonic device selects an effective gear in the HPRF mode from a preset gear list by using the time blind area set to perform ultrasonic scanning, and displays the scanning image on the display.

[0129] In the embodiment, the time blind zone set includes not only the parameter preparation stage and the transmission excitation stage listed in the foregoing embodiments, but also the receiving time of the interference signal in the echo receiving stage. Therefore, the time blind zone set is used to select an effective PRF mode in the preset PRF list, which can not only avoid the inherent time blind zone (such as the parameter preparation stage and the transmission excitation stage) in the HPRF mode, but also avoid using the PRF mode that generates the interference signal, so that a more effective PRF mode is selected for HPRF mode scanning, the quality of the echo signal is improved, and the imaging accuracy is improved.

[0130] In the embodiment, the specific working process of the determination process of the time blind zone set and other steps can refer to the corresponding content disclosed in the foregoing embodiments, and will not be described here.

[0131] The following describes an ultrasonic scanning method provided in the embodiment of the application. The ultrasonic scanning method described below can be mutually referred to with the foregoing embodiments.

[0132] An ultrasonic scanning method is applied to an ultrasonic device, and includes: after an effective PRF mode is selected according to the method described in any of the foregoing embodiments, performing ultrasonic scanning based on the selected PRF mode.

[0133] In the embodiment, after the ultrasonic device enters the HPRF mode, an effective PRF mode can be automatically selected in the HPRF mode based on the time blind zone set determined in the foregoing embodiments, so that the HPRF scanning is performed on the measured object, and a scanning image is obtained.

[0134] It can be seen that the embodiment provides an ultrasonic scanning method. Because a more effective PRF mode can be selected for HPRF mode scanning based on the time blind zone set, the quality of the echo signal and the imaging accuracy can be improved, and the ultrasonic image can be displayed more clearly and accurately.

[0135] The following describes a PRF selection device provided in the embodiment of the application. The PRF selection device described below can be mutually referred to with the foregoing embodiments.

[0136] Please refer to Figure 7 , Figure 7 A PRF selection device provided in the embodiment of the application is shown in a schematic diagram. The PRF selection device is applied to an ultrasonic device, and includes:

[0137] The PW scanning module 701 is configured to: if it is determined that the measured object is located at a depth position, select a scanning PRF value matched with the depth position, and perform PW scanning on the measured object.

[0138] The time blind area updating module 702 is configured to detect the interference signal in the echo signal collected in the PW sweep process, and add the receiving time of the interference signal to the time blind area of the HPRF mode at the depth position to obtain a time blind area set.

[0139] The selection module 703 is configured to select an effective gear of the HPRF mode from a preset gear list by using the time blind area set.

[0140] In an embodiment, the PW sweep module comprises:

[0141] The calculation unit is configured to calculate a sweep limit value corresponding to the depth position.

[0142] The selection unit is configured to select, from each gear value corresponding to the preset gear list, a gear value not greater than the sweep limit value as a sweep gear value.

[0143] In an embodiment, the selection unit is specifically configured to:

[0144] In each gear value, the maximum gear value not greater than the sweep limit value is selected as the sweep gear value.

[0145] In an embodiment, the selection unit is specifically configured to:

[0146] In each gear value, a gear value not greater than the sweep limit value is randomly selected as the sweep gear value.

[0147] In an embodiment, the time blind area updating module is specifically configured to:

[0148] The echo reflected by each preset detection point in the echo signal is subjected to frequency domain analysis, and if the spectral energy mean of any echo exceeds a first threshold value, the echo is determined as the interference signal.

[0149] In an embodiment, the time blind area updating module is specifically configured to:

[0150] The echo reflected by each preset detection point in the echo signal is subjected to time domain analysis, and if the time domain standard deviation of any echo exceeds a second threshold value, the echo is determined as the interference signal.

[0151] In an embodiment, the time blind area updating module is specifically configured to:

[0152] The inherent time blind area of the HPRF mode at the depth position is obtained based on a parameter preparation stage and a transmission excitation stage; and the receiving time of the interference signal is added to the inherent time blind area to obtain a time blind area set.

[0153] In an embodiment, the selection module comprises:

[0154] The judging unit is configured to judge whether each gear value corresponding to the preset gear list is covered by the time blind area set respectively.

[0155] The determining unit is configured to determine the PRF gear corresponding to the gear value not covered by the time blind area set as a valid gear.

[0156] In an implementation, the judging unit is specifically configured to:

[0157] determine the echo receiving time of the ultrasonic wave emitted to the depth position;

[0158] for each gear value, calculate the remainder of the echo receiving time divided by any gear value;

[0159] if the remainder falls within the time blind area set, it is determined that the gear value is covered by the time blind area set; otherwise, it is determined that the gear value is not covered by the time blind area set.

[0160] In the embodiment, the more specific working processes of the modules and units can refer to the corresponding content disclosed in the foregoing embodiments, and will not be described here in detail.

[0161] It can be seen that the embodiment provides a gear selection device, which can not only avoid the inherent time blind area (such as the parameter preparation stage and the transmission excitation stage) in the HPRF mode, but also avoid selecting the PRF gear with serious interference signals in the echo receiving stage, and select a more effective PRF gear, so that the echo receiving quality is good and the interference signals are few when the HPRF mode is scanned at the finally selected PRF gear, thereby improving the quality of the echo signal and the imaging accuracy.

[0162] An ultrasonic scanning device provided by an embodiment of the present application will be described below. The ultrasonic scanning device described below can be referred to the above embodiments.

[0163] An ultrasonic scanning device applied to an ultrasonic device, comprising:

[0164] The scanning module is configured to perform ultrasonic scanning based on the selected gear after selecting the valid gear in the HPRF mode according to the method in any of the above embodiments.

[0165] It can be seen that the embodiment provides an ultrasonic scanning device, which can improve the quality of the echo signal and the imaging accuracy, and make the ultrasonic image display clearer and more accurate.

[0166] An electronic device provided by an embodiment of the present application will be described below. The electronic device described below can be referred to the above embodiments.

[0167] Further, the embodiment of the present application further provides an electronic device. Wherein, the above-mentioned electronic device can be, for example,Figure 8 The server 50 shown can also be, for example Figure 9 The terminal 60 shown. Figure 8 And Figure 9 The electronic device structure diagrams shown are according to an exemplary embodiment, and the contents in the diagrams cannot be considered as any limitation on the use scope of the present application.

[0168] Figure 8 A server structure diagram is provided for an embodiment of the present application. The server 50 can specifically include at least one processor 51, at least one memory 52, a power supply 53, a communication interface 54, an input / output interface 55, and a communication bus 56. The memory 52 is used to store a computer program, which is loaded and executed by the processor 51 to implement the related steps in the gear selection method or ultrasonic scanning method disclosed in any of the preceding embodiments.

[0169] In this embodiment, the power supply 53 is used to provide working voltage for each hardware device on the server 50; the communication interface 54 can create a data transmission channel between the server 50 and external devices, and the communication protocol it follows can be any communication protocol applicable to the technical solution of the present application, which is not limited here; the input / output interface 55 is used to obtain external input data or output data to the outside world, and the specific interface type can be selected according to the specific application needs, which is not limited here.

[0170] In addition, the memory 52, as a carrier for resource storage, can be a read-only memory, a random access memory, a magnetic disk, or an optical disk, etc., and the resources stored thereon include an operating system 521, a computer program 522, and data 523, etc., and the storage mode can be temporary storage or permanent storage.

[0171] The operating system 521 is used to manage and control each hardware device on the server 50 and the computer program 522, so as to realize the operation and processing of the processor 51 on the data 523 in the memory 52, and it can be Windows Server, Netware, Unix, Linux, etc. The computer program 522 can further include computer programs for completing other specific work in addition to the computer programs for completing the gear selection method disclosed in any of the preceding embodiments. The data 523 can include application program developer information and other data in addition to application program update information and other data.

[0172] Figure 9 A terminal structure diagram is provided for an embodiment of the present application, and the terminal 60 can specifically include, but is not limited to, a smart phone, a tablet computer, a notebook computer, or a desktop computer, etc.

[0173] Generally, the terminal 60 in the present embodiment includes a processor 61 and a memory 62.

[0174] The processor 61 can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 61 can be implemented in at least one of a hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), a PLA (Programmable Logic Array). The processor 61 can also include a main processor and a coprocessor. The main processor is a processor for processing data in a wake-up state, also known as a CPU (Central Processing Unit). The coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 61 can be integrated with a GPU (Graphics Processing Unit) that is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 61 can also include an AI (Artificial Intelligence) processor for processing machine learning-related computing operations.

[0175] The memory 62 can include one or more computer-readable storage media, which can be non-transitory. The memory 62 can also include a high-speed random access memory, and a non-volatile memory such as one or more disk storage devices, flash storage devices. In the present embodiment, the memory 62 is at least used to store the following computer program 621, wherein the computer program is loaded and executed by the processor 61, and can implement the related steps in the gear selection method disclosed by any of the preceding embodiments executed by the terminal side. In addition, the resources stored in the memory 62 can also include an operating system 622 and data 623, etc., and the storage mode can be temporary storage or permanent storage. The operating system 622 can include Windows, Unix, Linux, etc. The data 623 can include but is not limited to application update information.

[0176] In some embodiments, the terminal 60 can also include a display screen 63, an input / output interface 64, a communication interface 65, a sensor 66, a power supply 67, and a communication bus 68.

[0177] Those skilled in the art can understand that the structure shown in the above embodiments does not constitute a limitation on the terminal 60, and can include more or fewer components than those shown in the drawings. Figure 9 The structure shown in the above embodiments does not constitute a limitation on the terminal 60, and can include more or fewer components than those shown in the drawings.

[0178] The storage medium provided by the embodiment of the present application is introduced as follows, and the storage medium described below can be referred to with the above embodiment.

[0179] Further, the embodiment of the present application further discloses a storage medium, wherein the storage medium stores computer executable instructions, and the computer executable instructions are loaded and executed by a processor to realize the gear selection method or the ultrasonic scanning method disclosed in any of the above embodiments. The specific steps of the method can refer to the corresponding content disclosed in the above embodiments, and will not be repeated here.

[0180] It should be noted that the above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0181] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0182] The principles and implementation manners of the present application are described by using specific examples in the present application. The above embodiment is only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the above description of the specification should not be understood as the limitation of the present application.

Claims

1. A gear selection method characterized by, The application is applied to an ultrasonic device, comprising: If a depth position of a measured object is determined, a scanning gear value matched with the depth position is selected to perform PW scanning on the measured object; Interference signals in echo signals collected in the PW scanning process are detected, and a receiving time of the interference signals is added to a time blind area of the HPRF mode at the depth position to obtain a time blind area set; An effective gear of the HPRF mode is selected from a preset gear list by using the time blind area set; The effective gear of the HPRF mode selected from the preset gear list by using the time blind area set comprises: respectively judging whether each gear value corresponding to the preset gear list is covered by the time blind area set; and determining a PRF gear corresponding to a gear value not covered by the time blind area set as the effective gear. The respective judgment whether each gear value corresponding to the preset gear list is covered by the time blind area set comprises: determining an echo receiving time of an ultrasonic wave transmitted to the depth position; calculating a remainder of the echo receiving time divided by any gear value for each gear value; if the remainder does not fall into the time blind area set, it is determined that the gear value is not covered by the time blind area set; and if the remainder falls into the time blind area set, it is determined that the gear value is covered by the time blind area set.

2. The method of claim 1, wherein, The selection of the scanning gear value matched with the depth position comprises: A scanning limit value corresponding to the depth position is calculated; In each gear value corresponding to the preset gear list, a gear value not greater than the scanning limit value is selected as the scanning gear value.

3. The method of claim 2, wherein, The selection of the scanning gear value not greater than the scanning limit value from each gear value corresponding to the preset gear list comprises: In the each gear value, a maximum gear value not greater than the scanning limit value is selected as the scanning gear value; or In the each gear value, a gear value not greater than the scanning limit value is randomly selected as the scanning gear value. The detection of the interference signals in the echo signals collected in the PW scanning process comprises:

4. The method of claim 1, wherein, Frequency domain analysis is performed on echoes reflected by each preset detection point in the echo signals, and if a frequency spectrum energy mean value of any echo exceeds a first threshold value, the echo is determined as an interference signal; And / or Time domain analysis is performed on echoes reflected by each preset detection point in the echo signals, and if a time domain standard deviation of any echo exceeds a second threshold value, the echo is determined as an interference signal. The addition of the receiving time of the interference signals to the time blind area of the HPRF mode at the depth position to obtain the time blind area set comprises:

5. The method of claim 1, wherein, Inherent time blind areas of the HPRF mode at the depth position are obtained based on a parameter preparation stage and a transmission excitation stage; The receiving time of the interference signals is added to the inherent time blind areas to obtain the time blind area set. The application is applied to an ultrasonic device, comprising:

6. A gear selection device characterized by, A PW scanning module is configured to select a scanning gear value matched with a depth position of a measured object to perform PW scanning on the measured object if the depth position of the measured object is determined. ​ a time blind zone updating module, configured to detect an interference signal in echo signals collected in a PW scanning process, and add a receiving time of the interference signal to a time blind zone of the HPRF mode at the depth position to obtain a time blind zone set; a selection module, configured to select an effective gear of the HPRF mode in a preset gear list by using the time blind zone set; wherein the selecting the effective gear of the HPRF mode in the preset gear list by using the time blind zone set comprises: respectively judging whether each gear value corresponding to the preset gear list is covered by the time blind zone set; and determining a PRF gear corresponding to a gear value not covered by the time blind zone set as the effective gear; wherein the respectively judging whether each gear value corresponding to the preset gear list is covered by the time blind zone set comprises: determining an echo receiving time of an ultrasonic wave transmitted to the depth position; calculating a remainder of the echo receiving time divided by any gear value for each gear value; if the remainder does not fall into the time blind zone set, determining that the gear value is not covered by the time blind zone set; and if the remainder falls into the time blind zone set, determining that the gear value is covered by the time blind zone set.

7. An ultrasonic scanning method, characterized by, comprising: after selecting the effective gear of the HPRF mode according to the method of any one of claims 1 to 5, performing ultrasonic scanning based on the selected gear.

8. An electronic device, comprising: The electronic device comprises a processor and a memory; wherein the memory is configured to store a computer program, and the computer program is loaded and executed by the processor to implement the gear selection method of any one of claims 1 to 5.

9. A storage medium, characterized by The storage medium has computer executable instructions stored therein, and the computer executable instructions are loaded and executed by the processor to implement the gear selection method of any one of claims 1 to 5.

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