Method and device for controlling filament current in CT bulb tube

Abstract

The embodiment of the invention discloses a method for controlling filament current in a CT bulb tube. The method comprises the steps of detecting current tube current of the CT bulb tube and using the tube current as an mA feedback value; calculating the difference of an mA set value and the mA feedback value and using the difference as an error value; setting current filament current as a target current upper limit value if the error value is greater than a first error threshold value; setting the current filament current as a target current lower limit value if the error value is smaller than a second error threshold value, wherein the target current upper limit value is greater than the target current lower limit value, the first error threshold value is greater than 0, and the second error threshold value is smaller than 0. By means of the technical scheme, the change speed of actual tube current can rapidly follow the change of the mA set value, and accordingly quick adjustment of radiation dosage is achieved. In addition, the embodiment of the invention further provides a device for controlling the filament current in the CT bulb tube.

Description

technical field [0001] The invention relates to the control field of CT equipment, in particular to a control method and equipment for filament current in a CT bulb. Background technique [0002] X-ray tomography (Computed Tomography, CT for short) equipment is a commonly used medical diagnostic equipment. By irradiating X-rays to the subject's body and receiving the X-rays that penetrate the subject's body, CT equipment can form photographic pictures that can present the shape of organs and tissues in the subject's body. In CT equipment, X-rays are generated and emitted by CT bulbs (also known as X-ray tubes). [0003] A CT bulb is actually a large high vacuum cathode ray diode with a cathode and an anode on which a filament is placed. During the working process of the CT bulb, by adding current to the cathode filament, the filament is heated and free electrons gather, and then high voltage is applied to the cathode and anode. Due to the sharp increase in the potential di...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method and device for controlling the filament current in a CT tube to solve the actual tube current caused by calculating the error value of the tube current using a PID controller in the prior art. It is difficult for the current to quickly follow the change of the mA set value and to realize the technical problem of rapid adjustment of the radiation dose

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