CN113456100B - Intelligent control method and device of CT scanning system and CT scanning system - Google Patents
Intelligent control method and device of CT scanning system and CT scanning system Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4411—Constructional features of apparatus for radiation diagnosis the apparatus being modular
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
Abstract
The invention provides an intelligent control method and device of a CT scanning system and the CT scanning system, wherein the method comprises the following steps: obtaining predicted scanning parameters corresponding to a plurality of data samples to be executed by a CT scanning system; measuring the voltage of a direct current bus of the CT scanning system; predicting the attenuation amplitude of the DC bus voltage when the CT scanning system executes each data sample based on the DC bus voltage and the predicted scanning parameters corresponding to each data sample; and regulating and controlling the working state of the CT scanning system according to the attenuation amplitude of the DC bus voltage. The scheme provided by the invention can control the cost of the CT scanning system, and simultaneously promote the working efficiency of the CT scanning system, thereby ensuring the smooth scanning operation of the CT system.
Description
Technical Field
The invention relates to the field of CT scanning, in particular to an intelligent control method and device of a CT scanning system and the CT scanning system.
Background
The fluctuation of the input voltage range allowed by the current CT equipment is +/-10%, and for CT systems used in areas such as vehicle-mounted CT systems which are frequently operated by using a generator or unstable power supplies, the generator usually has the defects of low automatic voltage regulation speed, high internal resistance and the like, so that the output voltage drops greatly during high-power scanning, and therefore, the fluctuation of the input voltage can cause the scanning failure or the scanning incapacity of the CT system. For the problems, the problems can be solved only by using a generator with high voltage regulation speed or using a generator with power far exceeding the power required by the machine or reducing the scanning power, and the adoption of the method is low in efficiency and can greatly increase the cost of the CT equipment.
Disclosure of Invention
The present invention has been made in view of the above problems, and it is an object of the present invention to provide an intelligent control method and apparatus for a CT scanning system, and a CT scanning system, which overcome or at least partially solve the above problems.
According to a first aspect of the present invention, there is provided an intelligent control method of a CT scanning system, comprising:
obtaining predicted scanning parameters corresponding to a plurality of data samples to be executed by a CT scanning system;
measuring the voltage of a direct current bus of the CT scanning system;
predicting an attenuation amplitude of the dc bus voltage when the CT scanning system performs each of the data samples based on the dc bus voltage and a predicted scan parameter corresponding to each of the data samples;
regulating and controlling the working state of the CT scanning system according to the attenuation amplitude value of the DC bus voltage.
Optionally, predicting the attenuation amplitude of the dc bus voltage when the CT scanning system performs each data sample based on the dc bus voltage and the predicted scanning parameter corresponding to each data sample includes:
calculating the impedance of a power supply line of a high-voltage generator input power supply in the CT scanning system;
calculating predicted scanning power based on predicted scanning parameters corresponding to each data sample;
and calculating the attenuation amplitude of the DC bus voltage when the CT scanning system performs each data sampling by using the line impedance and the predicted scanning power.
Optionally, said calculating the attenuation amplitude of the dc bus voltage when the CT scanning system performs each of the data samples using the line impedance and the predicted scan power includes:
calculating the attenuation amplitude of the DC bus voltage during each data sampling by using the following formula;
the attenuation amplitude of the dc bus voltage=p×r/U;
wherein P represents the predicted scan power, R represents the line impedance, and U represents the DC bus voltage measured during bulb exposure.
Optionally, the calculating the impedance of the power supply line of the input power supply of the high voltage generator in the CT scanning system includes:
acquiring a first voltage of a direct current bus and a second voltage of the direct current bus of a bulb tube in the CT scanning system before exposure and during a set power exposure period;
and calculating the impedance of a power supply line of a high-voltage generator input power supply in the CT scanning system based on the first voltage of the direct current bus and the second voltage of the direct current bus.
Optionally, calculating the impedance of a power supply line of a high voltage generator input power supply in the CT scanning system by using the following formula;
R＝U 2 *(U 1 -U 2 )/P
wherein R represents the impedance of an input power supply line of the high-voltage generator; u (U) 1 The first voltage of a direct current bus before bulb tube exposure is shown; u (U) 2 A second voltage of the direct current bus during bulb exposure; p represents the exposure power.
Optionally, the adjusting the working state of the CT scanning system according to the attenuation amplitude of the dc bus voltage includes:
acquiring the power supply voltage of a high-voltage generator detected before CT scanning is performed by the CT scanning system, and calculating the difference voltage of the attenuation amplitude of the power supply voltage and the DC bus voltage as a prediction voltage;
and comparing the predicted voltage with the threshold voltage, and regulating and controlling the working state of the CT scanning system according to a comparison result.
Optionally, the adjusting the working state of the CT scanning system according to the comparison result includes:
for any data sampling, if the predicted voltage is greater than or equal to the threshold voltage, controlling the CT scanning system to continue scanning;
if the predicted voltage is smaller than the threshold voltage, adjusting the predicted scanning parameter corresponding to the data sample until the calculated predicted voltage corresponding to the data sample is smaller than the threshold voltage;
and if the predicted scanning parameter corresponding to the data sample reaches a limit value, controlling the CT scanning system to terminate scanning and reporting errors.
According to a second aspect of the present invention, there is provided an intelligent control device of a CT scanning system, comprising:
the parameter prediction module is used for obtaining predicted scanning parameters corresponding to a plurality of data samples to be executed by the CT scanning system;
the data measurement module is used for measuring the direct current bus voltage of the CT scanning system;
the calculation module is used for predicting the attenuation amplitude of the DC bus voltage when the CT scanning system executes each data sample based on the DC bus voltage and the predicted scanning parameters corresponding to each data sample;
and the control module is used for regulating and controlling the working state of the CT scanning system according to the attenuation amplitude value of the DC bus voltage.
According to a third aspect of the present invention, there is provided a computer readable storage medium for storing program code for performing the intelligent control method of the CT scanning system of any one of the first aspects.
According to a fourth aspect of the present invention, there is provided a CT scanning system, the computing device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the intelligent control method of the CT scanning system according to any one of the first aspect according to the instructions in the program code.
The invention provides an intelligent control method and device of a CT scanning system and the CT scanning system, wherein in the intelligent control method of the CT scanning system, the predicted scanning parameters corresponding to the predicted data are sampled, and the predicted scanning parameters and the impedance of an input power supply line of a CT high-voltage generator are utilized to calculate and predict the dropping condition of the DC bus voltage for a period of time, so that the working state of the CT scanning system is regulated and controlled according to the dropping condition of the DC bus voltage, the cost of the CT scanning system is controlled, the working efficiency of the CT scanning system is improved, and the scanning work of the CT system is ensured to be smoothly carried out.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a flow chart of an intelligent control method of a CT scanning system according to an embodiment of the invention;
FIG. 2 is a flow chart of an intelligent control method of a CT scanning system according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of an intelligent control device of a CT scanning system according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 1 is a schematic flow chart of an intelligent control method of a CT scanning system according to an embodiment of the present invention, and referring to fig. 1, it can be understood that the intelligent control method of a CT scanning system provided by the embodiment of the present invention at least includes the following steps S101 to S104.
S101, obtaining predicted scanning parameters corresponding to a plurality of data samples to be executed by the CT scanning system.
When a CT scanning system scans a human body, because of the difference in density and thickness of the tissue structure penetrated by X-rays, the CT scanning system needs to shoot from more angles when performing X-ray scanning. Thus, when the CT scanning system rotates around the human body for one revolution, 2320 data samples, namely 2320 views (view: CT acquires the acquisition point of the system in one scanning process, and multiple views exist in one scanning process) are usually generated. In the method provided in this embodiment, during the scanning performed by the CT scanning system, the scan parameters corresponding to each of the next data samples may be predicted in real time, and as the predicted scan parameters corresponding to the data samples, for example, the predicted scan parameters corresponding to several views to several tens of views may be predicted, and optionally, the predicted scan parameters may include predicted scan currents.
In this embodiment, the scanned object may be first subjected to scout scanning to obtain a CT scout slice of the scanned object, and then predict predicted scan parameters corresponding to a plurality of data samples to be performed according to the CT scout slice of the scanned object. In practical applications, before performing a CT scan, the positioning plate, such as the positive position plate, the lateral position plate, and the oblique position plate, may be scanned first, and further, the air in the CT positioning plate and the projection of the patient bed may be removed to obtain the projection of the scanned object, so as to determine the size of the scanned object and the attenuation characteristics of different positions, such as the attenuation value in the rotation direction and the attenuation value in the Z-axis direction.
In addition, since the scanning current can determine the emission amount of bulb filament electrons, that is, the dose of X-rays, in this embodiment, the scanning current corresponding to each data sample is predicted mainly based on the attenuation characteristics of different positions of the scanned object.
Alternatively, the predicted scan current for each data sample may be a range of currents, including currents at optimal image noise, as well as currents at worst image noise that may be used for diagnostic purposes. That is, for any data sample, the corresponding predicted scan parameter may include a predicted parameter range, and in particular, the predicted scan parameter may include a predicted current range, such as I 1 ～I n Wherein I 1 For current value at worst image noise for diagnostic purposes, I n Is the current value at the optimal image noise.
S102, measuring the DC bus voltage of the CT scanning system.
In the method provided by the embodiment, the direct current bus voltage of the CT scanning system can be measured in real time when the CT scanning system scans, the measured direct current bus voltage refers to the direct current voltage after three-phase full-wave rectification, and the line voltage value of the three-phase voltage which is approximately equal to 1.414 times is calculated according to a formula, namely, the direct current voltage is the input voltage of the high-voltage inverter circuit.
S103, predicting the attenuation amplitude of the DC bus voltage when the CT scanning system executes each data sample based on the DC bus voltage and the predicted scanning parameters corresponding to each data sample.
After obtaining the predicted scan parameters corresponding to each data sample, the predicted scan parameters can be used to predict the attenuation amplitude of the DC bus voltage when the CT scanning system performs the data sample, that is, the predicted scan parameters can be used to calculate the drop condition of the DC bus voltage of the next scan (several views to hundreds of views). In this embodiment, the predicted optimal image noise scan current is preferably used for calculation.
In an alternative embodiment of the present invention, the step S103 may further include the following steps S103-1 to S103-3 when predicting the attenuation amplitude of the dc bus voltage when the CT scanning system performs each data sampling.
S103-1, calculating the impedance of a power supply line of an input power supply of a high-voltage generator in the CT scanning system.
The working principle of the high-voltage generator of the CT scanning system is that the DC/DC conversion obtains direct-current DC bus voltage, and for three-phase full-wave rectification, the DC bus voltage value is equal to 1.414 times of the power line voltage. And then the DC bus voltage is subjected to resonance inversion, boosting and voltage doubling rectification to finally obtain direct-current high voltage, and then the direct-current high voltage is output to control filaments of the X-ray bulb tube to generate X rays. After the voltage of the direct current DC bus is lower than a certain threshold voltage, the high-voltage inverter circuit cannot work normally, and the high voltage can report errors and cut off high-voltage output.
Optionally, when the impedance of the power supply line of the input power source of the high-voltage generator is calculated, the first voltage of the direct current bus and the second voltage of the direct current bus of the bulb tube in the CT scanning system before exposure and during the set power exposure can be obtained; and calculating the impedance of the power supply line of the input power supply of the high-voltage generator in the CT scanning system based on the first voltage of the direct current bus and the second voltage of the direct current bus.
For example, the CT high-voltage generator input power supply line impedance can be routinely obtained by measuring the Direct Current (DC) bus voltage before and during exposure by low-to-medium power exposure such as preheating. Taking preheating as an example, when the bulb tube is preheated, the scanning voltage and the scanning current adopted by exposure can be obtained, and then the corresponding scanning power during exposure is obtained based on the scanning voltage and the scanning current, and further the impedance of the CT high-voltage generator input power supply line is obtained based on the DC bus voltage before and during exposure. Alternatively, the power of preheating scanning is generally medium and low, and the set power in this embodiment may be the power used when preheating the bulb, such as 80kV/30mA (2.4 kW), 80kV/200mA (16 kW), or other scanning power lower than 30 kW.
In the embodiment of the invention, the impedance of the power supply line of the input power supply of the high-voltage generator in the CT scanning system can be calculated by using the following formula;
R＝U 2 *(U 1 -U 2 )/P
wherein R represents the impedance of an input power supply line of the high-voltage generator; u (U) 1 The first voltage of a direct current bus before bulb tube exposure is shown; u (U) 2 A second voltage of the direct current bus during bulb exposure; p represents the exposure power.
For example, if the bulb is preheated by the parameter 80kV/30mA (2.4 kW), the first voltage U of the DC bus corresponding to each of the bulb before preheating and during preheating exposure can be measured 1 And a second voltage U of the DC bus 2 Meanwhile, the input power supply line impedance R of the high-voltage generator is calculated by using the parameter p=2.4 kW adopted by preheating.
S103-2, calculating the predicted scanning power based on the predicted scanning parameters corresponding to the data samples.
The predicted scan parameters corresponding to the plurality of data samples that have been predicted to be performed in step S102 described above may be selected as the predicted scan currents, and thus the scan powers corresponding to the respective data samples may be further calculated using the predicted scan currents. As described above in step S101, each data sampleThe corresponding predicted scan parameters may include a predicted parameter range I 1 ～I n For any data sampling, when calculating the predicted scanning power, the current value I under the optimal image noise can be preferentially selected n As a target predicted current to calculate a predicted scan power using the target predicted current.
S103-3, calculating the attenuation amplitude of the DC bus voltage when the CT scanning system performs each data sampling by using the line impedance and the predicted scanning power. Optionally, calculating the attenuation amplitude of the DC bus voltage during each data sampling by using the following formula;
the attenuation amplitude of the dc bus voltage=p×r/U;
wherein P represents the predicted scan power, R represents the line impedance, and U represents the DC bus voltage measured during bulb exposure. Under normal conditions, the voltage U used in calculating the attenuation amplitude of the dc bus voltage is the dc bus voltage measured in real time during the bulb tube exposure, and when the critical fault is reported, the voltage U used in calculating the attenuation amplitude of the dc bus voltage may be the threshold voltage. The threshold voltage is a voltage corresponding to high-voltage fault reporting, and the threshold voltages corresponding to different high-voltage bus voltages are different.
S104, regulating and controlling the working state of the CT scanning system according to the attenuation amplitude of the DC bus voltage.
After the attenuation amplitude of the DC bus voltage is calculated, the working state of the CT scanning system can be regulated and controlled according to the attenuation amplitude. Alternatively, the following steps S104-1 to S104-2 may be included.
S104-1, acquiring the power supply voltage of the high-voltage generator detected before the CT scanning system performs CT scanning, and calculating the difference voltage of the attenuation amplitude of the power supply voltage and the DC bus voltage as the prediction voltage.
S104-2, comparing the predicted voltage with the threshold voltage, and regulating and controlling the working state of the CT scanning system according to the comparison result. For any data sampling, if the predicted voltage is greater than or equal to the threshold voltage, controlling the CT scanning system to continuously execute scanning; if the predicted voltage is smaller than the threshold voltage, adjusting the predicted scanning parameter corresponding to the data sample until the calculated predicted voltage corresponding to the data sample is smaller than the threshold voltage; and if the predicted scanning parameter corresponding to the data sampling reaches the limit value, controlling the CT scanning system to terminate scanning and reporting errors.
The threshold voltage is the voltage corresponding to the high-voltage fault reporting, the threshold voltages corresponding to the different high-voltage bus voltages are different, for example, the voltage of the high-voltage bus A is lower than 400VDC fault reporting, and the corresponding set threshold voltage is 400VDC; the B high voltage is lower than 420VDC, and the corresponding set threshold voltage is 420VDC. In this embodiment, after the attenuation amplitude of the dc bus voltage is obtained by calculation, the power supply voltage of the high-voltage generator for detecting the CT scan system before performing the CT scan is also required to be obtained, for any data sample, the predicted voltage obtained after the power supply voltage is attenuated may be calculated, and when the predicted voltage is lower than the threshold voltage, at this time, the scan current corresponding to the data sample may be adjusted according to a certain step (e.g., 3-5 mA) until the predicted voltage corresponding to the data sample is greater than or equal to the threshold voltage.
The above description can be used to preferentially utilize the current value I under optimal image noise n Calculating corresponding predicted scanning power and corresponding DC bus voltage attenuation amplitude as target predicted current, and when the corresponding attenuated predicted voltage is lower than the threshold voltage, calculating the current value I under the optimal image noise n The adjustment is performed according to a certain length on the basis, specifically, a new target predicted current can be obtained after a certain step length is reduced on the basis of an original target predicted current, so that the corresponding scanning power and the attenuation amplitude of the DC bus voltage are calculated again, and the attenuated predicted voltage is compared with the threshold voltage until the target scanning current corresponding to the threshold voltage is obtained.
In addition, it is assumed that the adjustment range of the predicted scan current has reached a limit value, e.g., exceeded I mentioned in step S102 above 1 ～I n At this time, the CT scanning system can be controlled to stop scanning and report errors. The method provided in this embodiment can be used in control of CAnd the cost of the T scanning system is increased, the working efficiency of the CT scanning system is improved, and the scanning work of the CT system is ensured to be smoothly carried out.
The embodiments described in the above steps S101 to S104 are further described below by way of a detailed embodiment. Fig. 2 is a schematic flow chart of an intelligent control method of a CT scanning system according to an alternative embodiment of the present invention, and referring to fig. 2, it can be seen that the intelligent control method of a CT scanning system provided by the embodiment of the present invention at least includes the following steps S201 to S20.
S201, calculating the impedance of an input power supply line of a high-voltage generator; optionally, the DC bus voltage before and during exposure can be measured daily through low-medium power exposure such as preheating to obtain the impedance R of the input power supply line of the CT high-voltage generator, and the calculation formula of R is as follows:
R＝U during exposure period *(U Before exposure to light -U During exposure period )/P Exposure power
S202, when a CT system performs scanning, predicting a predicted scanning current corresponding to a plurality of data samples to be performed; in general, the scan current used for the next scan (several data sample views to several tens of data sample views) can be predicted, and the predicted scan current for each data sample view predicted consists of a range of current values, i.e., each data sample predicted is a scan current value range that includes the current value at the optimal image noise and also includes the current value at the worst image noise that can be used for diagnostic purposes; for example, the predicted scan current has a value range I 1 ～I n Wherein I n Corresponding to the current value under the optimal image noise, I 1 Corresponding to the current value at the worst image noise.
Step S203, measuring the dc bus voltage.
Step S204, selecting a target current value according to the scanning current value range, and calculating the attenuation amplitude of the DC bus voltage according to the DC bus voltage and the target current value. For any data sampling, any scanning current in the value range of the predicted current gun can be selected to calculate, and optionally, the current value under the optimal image noise can be selected as the target current value to calculate the attenuation amplitude of the DC bus voltage. Alternatively, the target current value may be used to calculate the corresponding predicted scan power first, and then the attenuation amplitude of the dc bus voltage may be calculated using the predicted scan power.
Wherein, the attenuation amplitude=p×r/U of the dc bus voltage, P represents the predicted scan power, R represents the line impedance, and U represents the dc bus voltage measured during bulb exposure. When critical fault is reported, the voltage U used in calculating the attenuation amplitude of the dc bus voltage may be a threshold voltage, which may be set according to different types of high-voltage bus voltages, which is not limited in the embodiment of the present invention.
Step S205, calculating the predicted voltage corresponding to each data sample after attenuation by using the attenuation amplitude, and judging whether the predicted voltage falls below a threshold voltage; when calculating the predicted voltage corresponding to each attenuated data sample, the power supply voltage U of the high-voltage generator for the CT scanning system to detect before CT scanning can be obtained first, and the U-P R/U can be further judged Threshold value Whether or not it is smaller than U Threshold value If yes, step S206 is executed, and if no, step S208 is executed.
Step S206, adjusting a target current value, and judging whether the target current value exceeds a scanning current value range; if yes, step S207 is executed, and if no, step S202 is executed continuously. Step S202 above refers to predicting the scan current as I 1 ～I n Optionally, when the predicted voltage drops below the threshold voltage, the current value used for prediction may be adjusted downward according to a certain step to reselect the target current value, and then step S204 is continuously performed to recalculate the attenuation amplitude of the dc bus voltage.
Step S207, reporting errors and terminating scanning.
In step S208, the CT scanning system is controlled to continue scanning.
Step S209, judging whether the scanning is completed, if yes, controlling the CT scanning system to end the scanning; if not, step S202 is executed, and a predetermined number of data samples after the plurality of data samples are re-sampled, and the steps S202 to S208 are executed.
According to the method provided by the embodiment of the invention, the impedance of the CT high-voltage generator input power supply line is obtained by measuring the voltage of the direct current DC bus before and during exposure. The DC bus voltage is then detected in real time during the sweep, while the predicted sweep power for the next period of time is calculated based on the predicted sweep current, and the predicted voltage sag condition is calculated based on the line impedance. According to the current detected DC bus voltage and the falling condition of the DC bus voltage for a period of time, whether the next scanning DC bus voltage falls below a threshold voltage is calculated, if the next scanning DC bus voltage can fall below the threshold voltage, the predicted scanning current value of the next scanning is readjusted, and the scanning can be smoothly executed on the premise of not influencing image diagnosis. For example, the mA parameter to be used next can be appropriately reduced in the case where image noise is acceptable, so that occurrence of scanning failure due to fluctuation of the input voltage can be avoided. The method provided by the embodiment of the invention can be suitable for scanning modes such as non-dose saving scanning, spiral scanning and the like.
Based on the same inventive concept, the embodiment of the present invention further provides an intelligent control device of a CT scanning system, as shown in fig. 3, where the intelligent control device of a CT scanning system provided by the embodiment of the present invention may include:
a parameter prediction module 310, configured to obtain predicted scan parameters corresponding to a plurality of data samples to be executed by the CT scanning system;
the data measurement module 320 is configured to measure a dc bus voltage of the CT scanning system;
the calculation module 330 is configured to predict an attenuation amplitude of the dc bus voltage when the CT scanning system performs each data sample based on the dc bus voltage and a predicted scanning parameter corresponding to each data sample;
the control module 340 is configured to regulate an operating state of the CT scanning system according to an attenuation amplitude of the dc bus voltage.
In an alternative embodiment of the present invention, the computing module 330 may also be configured to:
calculating the impedance of a power supply line of a high-voltage generator input power supply in a CT scanning system;
calculating predicted scanning power based on predicted scanning parameters corresponding to each data sample;
and calculating the attenuation amplitude of the DC bus voltage when the CT scanning system performs each data sampling by using the line impedance and the predicted scanning power.
In an alternative embodiment of the present invention, the computing module 330 may also be configured to:
calculating the attenuation amplitude of the DC bus voltage during each data sampling by using the following formula;
the attenuation amplitude of the dc bus voltage=p×r/U;
wherein P represents the predicted scan power, R represents the line impedance, and U represents the DC bus voltage measured during bulb exposure.
In an alternative embodiment of the present invention, the computing module 330 may also be configured to:
acquiring a first voltage of a direct current bus and a second voltage of the direct current bus of a bulb tube in a CT scanning system before exposure and during a set power exposure period;
and calculating the impedance of the power supply line of the input power supply of the high-voltage generator in the CT scanning system based on the first voltage of the direct current bus and the second voltage of the direct current bus.
In an alternative embodiment of the present invention, the computing module 330 may also be configured to:
R＝U 2 *(U 1 -U 2 )/P
wherein R represents the impedance of an input power supply line of the high-voltage generator; u (U) 1 The first voltage of a direct current bus before bulb tube exposure is shown; u (U) 2 A second voltage of the direct current bus during bulb exposure; p represents the exposure power.
In an alternative embodiment of the present invention, the control module 340 may also be configured to:
acquiring the power supply voltage of a high-voltage generator detected before CT scanning by a CT scanning system, and calculating the difference voltage of the attenuation amplitude of the power supply voltage and the DC bus voltage as a predicted voltage;
and comparing the predicted voltage with the threshold voltage, and regulating and controlling the working state of the CT scanning system according to the comparison result.
In an alternative embodiment of the present invention, the control module 340 may also be configured to:
for any data sampling, if the predicted voltage is greater than or equal to the threshold voltage, controlling the CT scanning system to continuously execute scanning;
when the predicted voltage is smaller than the threshold voltage, adjusting the predicted scanning parameter corresponding to the data sample until the calculated predicted voltage corresponding to the data sample is smaller than the threshold voltage;
and when the predicted scanning parameters corresponding to the data samples reach the limit values, controlling the CT scanning system to terminate scanning and reporting errors.
An alternative embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium is used to store program code, where the program code is used to execute the intelligent control method of the CT scanning system described in the foregoing embodiment.
An alternative embodiment of the present invention also provides a CT scanning system, the computing device including a processor and a memory: the memory is used for storing the program codes and transmitting the program codes to the processor; the processor is configured to execute the intelligent control method of the CT scanning system according to the foregoing embodiment according to instructions in the program code.
Of course, in addition to the above description, the CT scanning system in this embodiment may further include an X-ray tube, a detector, a gantry, and the like, which are not described herein.
It will be clear to those skilled in the art that the specific working processes of the above-described systems, devices, modules and units may refer to the corresponding processes in the foregoing method embodiments, and for brevity, the description is omitted here.
In addition, each functional unit in the embodiments of the present invention may be physically independent, two or more functional units may be integrated together, or all functional units may be integrated in one processing unit. The integrated functional units may be implemented in hardware or in software or firmware.
Those of ordinary skill in the art will appreciate that: the integrated functional units, if implemented in software and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or in whole or in part in the form of a software product stored in a storage medium, comprising instructions for causing a computing device (e.g., a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present invention when the instructions are executed. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a read-only memory (ROM), a random-access memory (RAM), a magnetic disk, or an optical disk, etc.
Alternatively, all or part of the steps of implementing the foregoing method embodiments may be implemented by hardware (such as a personal computer, a server, or a computing device such as a network device) associated with program instructions, where the program instructions may be stored on a computer-readable storage medium, and where the program instructions, when executed by a processor of the computing device, perform all or part of the steps of the method according to the embodiments of the present invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all technical features thereof can be replaced by others within the spirit and principle of the present invention; such modifications and substitutions do not depart from the scope of the invention.
Claims (7)
1. An intelligent control method of a CT scanning system is characterized by comprising the following steps:
obtaining predicted scanning parameters corresponding to a plurality of data samples to be executed by a CT scanning system;
measuring the voltage of a direct current bus of the CT scanning system;
predicting an attenuation amplitude of the dc bus voltage when the CT scanning system performs each of the data samples based on the dc bus voltage and a predicted scan parameter corresponding to each of the data samples;
acquiring the power supply voltage of a high-voltage generator detected before CT scanning is performed by the CT scanning system, and calculating the difference voltage of the attenuation amplitude of the power supply voltage and the DC bus voltage as a prediction voltage;
comparing the predicted voltage with a threshold voltage, and regulating and controlling the working state of the CT scanning system according to a comparison result;
the predicting, based on the dc bus voltage and the predicted scan parameters corresponding to each of the data samples, the attenuation amplitude of the dc bus voltage when the CT scanning system performs each of the data samples includes:
calculating the impedance of a power supply line of a high-voltage generator input power supply in the CT scanning system;
calculating predicted scanning power based on predicted scanning parameters corresponding to each data sample;
calculating the attenuation amplitude of the DC bus voltage during each data sampling by using the following formula;
the attenuation amplitude of the dc bus voltage=p×r/U;
wherein P represents the predicted scan power, R represents the line impedance, and U represents the DC bus voltage measured during bulb exposure.
2. The method of claim 1, wherein said calculating a high voltage generator input power supply line impedance in said CT scanning system comprises:
acquiring a first voltage of a direct current bus and a second voltage of the direct current bus of a bulb tube in the CT scanning system before exposure and during a set power exposure period;
and calculating the impedance of a power supply line of a high-voltage generator input power supply in the CT scanning system based on the first voltage of the direct current bus and the second voltage of the direct current bus.
3. The method of claim 2, wherein the high voltage generator input power supply line impedance in the CT scanning system is calculated using the formula;
R＝U 2 *(U 1 -U 2 )/P
wherein R represents the impedance of an input power supply line of the high-voltage generator; u (U) 1 The first voltage of a direct current bus before bulb tube exposure is shown; u (U) 2 A second voltage of the direct current bus during bulb exposure; p represents the exposure power.
4. The method of claim 1, wherein adjusting the operational state of the CT scanning system based on the comparison result comprises:
for any data sampling, if the predicted voltage is greater than or equal to the threshold voltage, controlling the CT scanning system to continue scanning;
if the predicted voltage is smaller than the threshold voltage, adjusting the predicted scanning parameter corresponding to the data sample until the calculated predicted voltage corresponding to the data sample is smaller than the threshold voltage;
and if the predicted scanning parameter corresponding to the data sample reaches a limit value, controlling the CT scanning system to terminate scanning and reporting errors.
5. An intelligent control device of a CT scanning system, comprising:
the parameter prediction module is used for obtaining predicted scanning parameters corresponding to a plurality of data samples to be executed by the CT scanning system;
the data measurement module is used for measuring the direct current bus voltage of the CT scanning system;
the calculation module is used for predicting the attenuation amplitude of the DC bus voltage when the CT scanning system executes each data sample based on the DC bus voltage and the predicted scanning parameters corresponding to each data sample;
the control module is used for acquiring the power supply voltage of the high-voltage generator detected before the CT scanning system executes CT scanning, and calculating the difference voltage of the attenuation amplitude of the power supply voltage and the DC bus voltage as a prediction voltage; comparing the predicted voltage with a threshold voltage, and regulating and controlling the working state of the CT scanning system according to a comparison result;
the predicting, based on the dc bus voltage and the predicted scan parameters corresponding to each of the data samples, the attenuation amplitude of the dc bus voltage when the CT scanning system performs each of the data samples includes:
calculating the impedance of a power supply line of a high-voltage generator input power supply in the CT scanning system;
calculating predicted scanning power based on predicted scanning parameters corresponding to each data sample;
calculating the attenuation amplitude of the DC bus voltage during each data sampling by using the following formula;
the attenuation amplitude of the dc bus voltage=p×r/U;
wherein P represents the predicted scan power, R represents the line impedance, and U represents the DC bus voltage measured during bulb exposure.
6. A computer readable storage medium for storing program code for performing the intelligent control method of the CT scanning system of any of claims 1-4.
7. A CT scanning system, wherein the computing device comprises a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the intelligent control method of the CT scanning system of any of claims 1-4 according to instructions in the program code.
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