14 results about "Filament current" patented technology

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 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.

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.

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.

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.

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 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.

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 at an operational X-ray source voltage during a pulsed X-ray imaging run, wherein each pair of 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 at the operational X-ray source voltage 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 the 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.