31 results about "Filament current" patented technology

The invention belongs to the technical field of microwave source equipment, and provides a microwave generator and a power output adjusting method and device, and the method comprises the steps: obtaining target output power, determining a power interval according to the target output power, and determining a corresponding control strategy according to the power interval. The control strategy includes executing several adjustment cycles. The nth regulation period comprises the following steps: executing at least one of a filament current control strategy and a magnetic field current control strategy; executing a power control strategy; the real-time output power of the microwave generator is collected, if the deviation value of the real-time output power and the target output power is within a first set range and lasts for a first time length, all the n control periods are completed, the process is ended, and the next period is not entered any more; otherwise, entering the (n + 1) th period, n being greater than or equal to 1. The optimal adjustment algorithm is selected according to the target output power, and a better power output adjustment effect is achieved.

To improve accuracy of tube current modulation, responsiveness, and an accepted modulation width and the like at the time of kV switching.SOLUTION: A storage unit stores characteristics data showing a relation between a filament current value and a tube current output value upon switching between a first tube voltage and a second tube voltage lower than the first tube voltage. A setting unit is a unit that sets a tube current setting value for performing tube current modulation in parallel with switching between the first tube voltage and the second tube voltage. The setting unit sets the first tube current setting value at the time of application of either the first tube voltage or the second tube voltage as the reference tube voltage, and sets a second tube current setting value based on the characteristics data and the first tube current setting value at the time of application of the other tube voltage. In synchronization with the switching between the first tube voltage and the second tube voltage, a tube current control circuit switches between tube current feedback control based on the first tube current setting value at the time of application of the reference tube voltage, and tube current feedback control based on the second tube voltage setting value at the time of application of the other tune voltage.SELECTED DRAWING: Figure 6

The invention belongs to the technical field of microwave sources, and provides a filament current and magnetic field current-based power output method, device and system, the method comprises the execution of a plurality of cycles, and the nth cycle comprises the following steps: obtaining and executing a control strategy, then collecting the real-time power of a magnetron, if the deviation value between the real-time power of the magnetron and the target power is within the set range, all the n periods are completed, otherwise, the n + 1th period is entered, and n is larger than or equal to 1; and after all periods are completed, if the deviation value between the real-time power and the target power is greater than a set value and the duration time exceeds the set time, re-executing the power output method. According to the method, a filament current control strategy, a magnetic field current control strategy and a power control strategy are adopted, the three strategies are in a synergistic effect, and the multiple strategies are organically fused, so that the operation of the magnetron is more stable and adaptive.

The application belongs to the technical field of microwave sources, and provides a power output method, device and system based on filament current and magnetic field current, wherein the method comprises executing a plurality of periods, the nth period comprising the following steps: acquiring and executing a control strategy, then collecting the real-time power of the magnetron, if the deviation value of the real-time power of the magnetron and the target power is within the set range, then all the n periods are completed, otherwise the (n+1)th period is entered, n>=1; after all the periods are completed, if the deviation value of the real-time power and the target power is greater than the set value and the duration exceeds the set time, then the power output method is re-executed. The method of the application adopts a filament current control strategy, a magnetic field current control strategy and a power control strategy, and the three strategies work together, and the organic integration of the multiple strategies makes the operation of the magnetron more stable and adaptive.

This invention discloses a control method for the filament of an X-ray tube suitable for dual-energy exposure, comprising the following steps: performing a first exposure, wherein the filament current of the X-ray tube during the first exposure is FL1; after the first exposure, turning off the high-voltage output, determining and setting the rise and fall current FL0 of the X-ray tube filament, the output time t of FL0, and the filament current FL2 for the second exposure; after the X-ray tube filament is loaded with FL2 and held for t, and after the X-ray tube filament is loaded with FL2 and held for a period of time, performing the second exposure; when FL2 > FL1, FL0 > FL1 and FL2; when FL2 < FL1, FL0 < FL1 and FL2. The control method of this invention can reduce the interval time of dual-energy exposure, thereby reducing motion artifacts, and can effectively suppress overshoot or undershoot of the X-ray tube current during the second exposure, making the X-ray dosage more precise.

The invention discloses a filament current control method, a filament current control system and an X-ray machine. The filament current control method is used for controlling the filament current of a cathode filament in a bulb tube of the X-ray high-voltage generator, and comprises the following steps: when the bulb tube current of the bulb tube exceeds a preset condition, carrying out iterative learning on the corresponding filament current of each exposure parameter point through an iterative learning controller to obtain an exposure parameter point; and the corresponding filament current preset value IFRefSave of each exposure parameter point is updated after iteration, so that the filament current can be controlled by using the updated corresponding filament current preset value when a user uses each exposure parameter point for exposure again. By adopting the iterative learning method, the problem that the accuracy of short-time exposure is reduced due to the change of the corresponding relationship between the filament current and the bulb tube current caused by the aging reason of the long-time use of the bulb tube in the prior art can be effectively avoided.

The present disclosure provides a method, system, and apparatus for controlling X-rays. The method of the present disclosure includes: obtaining control parameters in response to an X-ray control request from a CT control unit, wherein the control parameters include at least one tank identifier, at least one voltage parameter, at least one current parameter, and at least one exposure timing; controlling, based on the tank identifier and the voltage parameter, at least one high frequency inverter of a high frequency inverter assembly to output a high frequency voltage to a corresponding tank; and controlling, based on the tank identifier and the current parameter, at least one filament power supply of a filament power supply assembly to output a filament current to the corresponding tank, thereby controlling the tank to perform an X-ray exposure task according to the exposure timing.

The present application relates to the technical field of X-ray tubes. The present application discloses a method and system for predicting X-ray tube and filament performance degradation and failure determination. The method comprises: obtaining filament data of an X-ray tube and constructing training sample data and test sample data; predicting the predicted filament current using a degradation prediction model and predicting the predicted filament current distribution using an uncertainty prediction model, wherein the uncertainty prediction model is constructed based on at least two degradation prediction models; calculating the uncertainty of the predicted current; calculating the failure range of the filament; in response to the filament degradation rate exceeding the failure range at a certain moment, determining the moment as the failure moment; and calculating the filament failure time based on the failure moment and the uncertainty. In an embodiment of the present application, the reliability of the predicted filament current can be determined based on the uncertainty, and the filament failure time is calculated based on the uncertainty, thereby further improving the accuracy of predicting the filament failure time.

The invention relates to a method for predicting a failure of at least one component of an X-ray tube (11), in which at least one reference value of the X-ray tube (11) is stored in an evaluation device of a controller for the X-ray tube (11), wherein the X-ray tube (11) comprises a cathode (16) with a filament (18), and at least one filament current of the cathode (16), an anode current of an anode (14) of the X-ray tube (11), and / or an anode voltage are stored as a reference value, in which, during operation of the X-ray tube (11), actual values of at least the filament current, the anode current and / or the anode voltage are detected and fed to the evaluation device, in which at least one prediction for a filament failure and one prediction for a vacuum leakage at a housing (12) of the X-ray tube (11) is determined in the evaluation device at least on the basis of a comparison of the reference values and the values actually detected during operation of the X-ray tube (11) and, based thereon, at least one of the predictions for the failure of the filament (18) and the leakage of the housing (12) of the X-ray tube (11) is output.

Controlling a high voltage generator for an X-ray source includes: providing (410) power to the X-ray source to generate a plurality of X-ray pulses during a pulsed X-ray imaging run, wherein subsequent X-ray pulses of the plurality of X-ray pulses are temporally separated by an emission pause comprising a first part and a second part; providing (420) an operational filament current to heat a filament of a cathode of the X-ray source to an operational filament temperature during the plurality of X-ray pulses to generate a desired X-ray imaging emission current during the X-ray pulses; providing (430) a blanking filament current during the first part of the emission pauses, wherein the blanking filament current is lower than the operational filament current, to allow the filament temperature to decrease to an intercooler filament temperature; providing (440) a boosting filament current during the second part of the emission pauses, wherein the boosting filament current is higher than the blanking filament current, to increase the filament temperature from the intercooler filament temperature to the operational filament temperature; receiving (450) a measured emission current, the operational filament current, and an operational source voltage of an X-ray pulse, wherein the measured emission current is measured during the X-ray pulse at the operational filament current and the operational X-ray source voltage; determining (460) an expected emission current of the X-ray pulse, in dependence on the operational filament current and the operational X-ray source voltage; and adapting (470) the duration of providing the blanking current during the first part of a subsequent emission pause, and / or adapting the duration of providing the boosting current during the second part of the subsequent emission pause, to correct the operational filament temperature of a subsequent X-ray pulse for a difference between the measured emission current and the expected emission current.

The present application provides a method, device, equipment and storage medium for predicting the life of a tube, which relates to the field of medical equipment technology. The method obtains a filament current prediction model, a failure current threshold of the current target tube, and filament current data, and obtains target predicted current data based on the filament current data and the filament current prediction model. The life of the current target tube is determined according to the failure current threshold and the target predicted current data. Based on the filament current data of the current target tube and the filament current prediction model, the filament current change trend of the current target tube within the prediction time can be predicted, and the life of the tube can be predicted in combination with the failure current threshold and the target predicted current data. By predicting the life of the tube through the filament current, which is a key factor affecting the life of the tube, the accuracy of the prediction can be improved, equipment shutdown caused by sudden tube failure can be avoided, the reliability of the tube operation can be improved, and the operating cost can be reduced.

This application disclosures a method for calibrating filament current data of an X-ray tube. The method includes obtaining a first value of tube current to be calibrated and a value of filament current to be calibrated, the tube current to be calibrated and the filament current to be calibrated corresponding to a first calibration point; performing an emission operation based on the first value of the tube current to be calibrated and the value of the filament current to be calibrated; determining an actual value of the tube current during the emission operation; determining a difference between the actual value of the tube current and the first value of the tube current to be calibrated; and calibrating, based on the difference, the first calibration point.

An X-ray CT apparatus stores characteristic data representing a relationship between a filament current value and a tube current value in a case of switching between a first tube voltage and a second tube voltage. The apparatus sets a first tube current setting value at a time of application of the first tube voltage, and sets a second tube current setting value based on characteristic data and the first tube current setting value at a time of application of the second tube voltage. The apparatus switches between tube current feedback control based on the first tube current setting value at the time of application of the first tube voltage, and tube current feedback control based on the second tube current setting value at the time of application of the second tube voltage.

The present invention discloses an output intensity control method and system for an X-ray source. By predicting the output intensity of the X-ray source using operating voltage, filament current, and operating temperature, and determining the target operating voltage and target filament current corresponding to the target output intensity value based on the actual output intensity, the predicted output intensity value, and the target output intensity value of the X-ray source, the determination process of the target operating voltage and target filament current takes into account the temperature drift problem caused by the temperature rise during long-term operation of the X-ray source, thereby improving the output intensity stability of the X-ray source.

In one embodiment, an X-ray CT apparatus can perform a tube-current modulation scan. The X-ray CT apparatus includes an X-ray tube, a memory, an X-ray tube power supply, processing circuitry, and a filament control circuit. The memory stores, for each tube voltage to be applied to the X-ray tube, characteristic data in which a filament current flowing through a filament in the X-ray tube and the tube current are associated with each other. The X-ray tube power supply applies the tube voltage to the X-ray tube by periodically switching the tube voltage between a first value and a second value lower than the first value. The processing circuitry updates the command value of the tube current at a predetermined timing according to switching of the tube voltage. The filament control circuit specifies a filament-current command-value corresponding to the command value of the tube current based on the characteristic data.

The embodiment of the present application provides a kind of X-ray equipment filament current adaptive correction method and device, the method comprises the following steps: determining the target tube current of X-ray equipment, the preset filament current corresponding to target tube current is determined using the parameter comparison table established in advance, wherein the parameter comparison table records the corresponding relationship between tube current and filament current;With the preset filament current determined as the input initial value of closed-loop control, with the detection result of the actual filament current and actual tube current of X-ray equipment as the feedback information of closed-loop control, adjust filament current, so that the tube current of X-ray equipment is stabilized at target tube current, and the actual filament current of each feedback is recorded;The target filament current corresponding to corrected target tube current is calculated using actual filament current;The preset filament current corresponding to target tube current in parameter comparison table is updated using the target filament current calculated, and the adaptive correction of X-ray equipment filament current is realized by the above method.

Systems and methods of adaptively controlling filament current in an x-ray tube of an imaging system include the x-ray tube having a filament being calibrated. Calibration data from the calibration of the x-ray tube is stored at the imaging system, the calibration data including a filament current value that determines a tube current value for a tube voltage value at a plurality of stations. A resistance value of the filament over a period of time is monitored. A change in the resistance value of the filament over the period of time is determined, and the filament current value of at least one of the plurality of stations is adjusted based on the changed resistance value.

To provide a control device, a control method, and a control program capable of efficiently acquiring an initial value of a filament current corresponding to a large number of radiation irradiation conditions.SOLUTION: A control device that controls a filament current flowing through a filament of a radiation source acquires a plurality of sets of tube current values and filament current values corresponding to the tube current values by controlling the filament current such that the tube current values have a plurality of different values in a state in which the emission of radiation is continued and outputs the plurality of sets of tube current values and the filament current values corresponding to the tube current values so as to be associated with each other.SELECTED DRAWING: Figure 6

Controlling a high voltage generator for an X-ray source includes: providing (410) power to the X-ray source to generate a plurality of X-ray pulses during a pulsed X-ray imaging run, wherein subsequent X-ray pulses of the plurality of X-ray pulses are temporally separated by an emission pause comprising a first part and a second part; providing (420) an operational filament current to heat a filament of a cathode of the X-ray source to an operational filament temperature during the plurality of X-ray pulses to generate a desired X-ray imaging emission current during the X-ray pulses; providing (430) a blanking filament current during the first part of the emission pauses, wherein the blanking filament current is lower than the operational filament current, to allow the filament temperature to decrease to an intercooler filament temperature; providing (440) a boosting filament current during the second part of the emission pauses, wherein the boosting filament current is higher than the blanking filament current, to increase the filament temperature from the intercooler filament temperature to the operational filament temperature; receiving (450) a measured emission current, the operational filament current, and an operational source voltage of an X-ray pulse, wherein the measured emission current is measured during the X-ray pulse at the operational filament current and the operational X-ray source voltage; determining (460) an expected emission current of the X-ray pulse, in dependence on the operational filament current and the operational X-ray source voltage; and adapting (470) the duration of providing the blanking current during the first part of a subsequent emission pause, and / or adapting the duration of providing the boosting current during the second part of the subsequent emission pause, to correct the operational filament temperature of a subsequent X-ray pulse for a difference between the measured emission current and the expected emission current.

The present invention relates to operating a filament of an X-ray tube. In order to provide X-ray tubes with improved wear out, a control device (10) for pulsed operation of a generator for an X-ray tube is provided. The X-ray tube may be controlled to provide a plurality of X-ray pulses, wherein two subsequent pulses are temporally separated by an emission pause. The emission pause comprises at least a first part and a second part. A filament current is provided to a cathode filament of the X-ray tube such that, in the emission pause between two subsequent pulses, during a first part of the pause a first filament current is provided and during a second part of the pause a second filament current is provided, the first filament current being lower than the second filament current. By operating the filament in this way, the filament temperature can be reduced, resulting in significantly less wear and longer lifetime of the X-ray tube.

The present invention provides a control method and device for exposure cut-off of a high-voltage generator. The method at least includes the following steps: obtaining exposure correction coefficients of different working conditions of the high-voltage generator in different exposure environments, and constructing a database according to each exposure correction coefficient; the working conditions include acceleration voltage and filament current; performing a correction process before exposure control according to the database and the exposure working conditions of the high-voltage generator; controlling the high-voltage generator to perform exposure under the exposure working conditions based on the correction result, and controlling the high-voltage generator to perform exposure cut-off. Performing correction before exposure control can effectively avoid the influence of errors, thereby accurately controlling exposure cut-off, and further making the result of image acquisition more accurate.

This application applies to the medical field, providing a method, apparatus, electronic device, and product for calibrating filament current. The method includes: determining a first filament current corresponding to a first tube current from a filament current lookup table; the filament current lookup table describes the correspondence between filament currents and tube currents; obtaining a second tube current generated by the X-ray tube under the first filament current and with the tube voltage applied to a preset tube voltage; determining the error between the second filament current corresponding to the second tube current in the filament current lookup table and the first filament current; and correcting the first filament current based on the error. Using this method, the calibration accuracy can be guaranteed while also improving the calibration efficiency of the first filament current.

The invention relates to the technical field of filament closed loop control devices, and particularly discloses a filament closed loop control device and a filament closed loop control method, the filament closed loop control device comprises an operation panel and a machine body rear shell connected with the rear side of the operation panel, the left side of the machine body rear shell is provided with a power interface, and the right side of the machine body rear shell is provided with a wiring port. According to the control device and the control method of the filament closed loop, through a dynamic maximum value taking strategy, a system automatically and preferentially adopts a filament current inner ring with faster response during starting or large-range adjustment, and automatically switches to a beam current outer ring with higher precision when a target value is approached, so that the unification of rapidness and stability is realized; and meanwhile, a set of fixed PID parameters can adapt to the ray tube and wide-range tube voltage change of the filament closed loop control device and control method with different characteristics, so that the equipment debugging process is remarkably simplified, the equipment universality is improved, and a better use effect is achieved.

A high voltage generator for an X-ray source is controlled to provide: power to the X-ray source to generate a plurality of X-ray pulses during a pulsed X-ray imaging run, wherein subsequent X-ray pulses of the plurality of X-ray pulses are temporally separated by a respective emission pause comprising a first part and a second part; an operational filament current to heat a filament of a cathode of the X-ray source to an operational filament temperature during the plurality of X-ray pulses to generate a desired X-ray imaging emission current during the X-ray pulses; a blanking filament current that is lower than the operational filament current to allow the filament temperature to decrease during the first part of the emission pauses, such that the filament temperature reaches an intercooler filament temperature, wherein the intercooler temperature is (i) lower than the operational filament temperature and (ii) at a level resulting in a non-zero emission current at an operational X-ray source voltage when the filament is at the intercooler filament temperature; and a boosting filament current that is higher than the blanking filament current to increase the filament temperature from the intercooler filament temperature to the operational filament temperature during the second part of the emission pauses.

Systems and methods of adaptively controlling filament current in an x-ray tube of an imaging system include the x-ray tube having a filament being calibrated. Calibration data from the calibration of the x-ray tube is stored at the imaging system, the calibration data including a filament current value that determines a tube current value for a tube voltage value at a plurality of stations. A resistance value of the filament over a period of time is monitored. A change in the resistance value of the filament over the period of time is determined, and the filament current value of at least one of the plurality of stations is adjusted based on the changed resistance value.

The present invention provides a filament current control method and system for a CT device. The filament current control method includes the following steps: The host computer sends exposure parameters to the high-voltage control system; The high-voltage control system sends the exposure parameters to the high-voltage generator; An FPGA chip in the high-voltage control system is preset with a filament current threshold value, and the real-time filament current and real-time tube current are read in real time; When the FPGA chip detects that the real-time filament current reaches the filament current threshold value, the PWM control strategy is started, and a filament current control value is output to the high-voltage controller, so that the real-time filament current and real-time tube current decrease and then rise within the control period; The above steps are repeatedly executed until the real-time tube current stabilizes at the desired tube current, and the value of the decreased real-time filament current controlled by the PWM control strategy at this time is recorded as the stable filament current; Exit the PWM control strategy. After adopting the above technical solution, exposure can still be completed even under the condition of filament current error reporting.

Embodiments disclosed in the present specification and drawings relate to an X-ray CT apparatus, a control apparatus, and a control method. The present invention addresses the problem of stabilizing the tube current of an X-ray tube in a tube current modulation scan of an X-ray CT device. An X-ray CT apparatus according to an embodiment includes an X-ray tube, a storage unit, a tube voltage power supply unit, an update unit, and a determination unit. The storage unit stores, for each tube voltage, characteristic data in which a filament current and a tube current are associated. The tube voltage power supply unit switches a tube voltage between a first tube voltage value and a second tube voltage value and applies the tube voltage to the X-ray tube. The update unit updates an instruction value of the tube current at a predetermined timing. The determination unit determines an indication value of the filament current on the basis of the characteristic data.

The embodiment of the invention discloses a filament emission characteristic correction method, device and system of an X-ray imaging system and a storage medium. The method comprises the steps that actual filament current and expected filament current for each exposure are obtained, and the expected filament current for any exposure is obtained according to expected tube voltage and expected tube current of the exposure and an original filament emission characteristic curve of an X-ray tube; and according to the obtained actual filament current and expected filament current for each exposure, calculating: correcting the expected filament current for each exposure into a correction parameter of the actual filament current for the corresponding exposure. According to the embodiment of the invention, the filament emission characteristic correction efficiency of the X-ray imaging system is improved.

The invention discloses an X-ray bulb tube filament control method suitable for dual-energy exposure, and the method comprises the following steps: carrying out the first exposure, and enabling the filament current of an X-ray bulb tube to be FL1 during the first exposure; closing the high-voltage output after the first exposure is finished, and determining and setting the lifting current FL0 of the X-ray bulb tube filament, the output time t of the FL0 and the filament current FL2 of the second exposure; after the X-ray bulb tube filament is loaded with FL2 and lasts for t, and after the X-ray bulb tube filament is loaded with FL2 and lasts for a period of time, second exposure is carried out; when the FL2 is greater than the FL1, the FL0 is greater than the FL1 and the FL2; when FL2 < FL1, FL0 < FL1 and FL2. According to the control method disclosed by the invention, the interval time of dual-energy exposure can be reduced so as to reduce motion artifacts, and meanwhile, the X-ray bulb tube current overshoot or insufficiency during the second exposure can be effectively inhibited, so that the X-ray dosage is more accurate.

The present invention provides a filament current calibration method and system for a CT device. The filament current calibration method includes the following steps: exposing at a first sampling point with a default filament current and a preset MA value to obtain a first target MA value; determining a default filament current and an ideal MA value based on a comparison result between the first target MA value and the preset MA value; fitting a nonlinear curve based on the default filament current and the ideal MA value; selecting a test MA value and a test filament current on the nonlinear curve, exposing to obtain an actual MA value, and replacing the test MA value; repeatedly performing the above operations until multiple sets of test filament currents and actual MA values ​​are obtained; correcting the nonlinear curve based on the test filament current and the actual MA value, and interpolating to obtain a corresponding relationship between the filament current and the MA value; and storing the above data in a filament current database. The above technical solution can reduce the number of word exposures during filament current calibration and improve the calibration quality of the filament current.