A control method and device for filament current in a CT tube
A filament current and tube technology, applied in X-ray equipment, electrical components, echo tomography, etc., can solve the problems of difficulty in actual tube current and rapid adjustment of radiation dose, and achieve the effect of rapid adjustment
Active Publication Date: 2017-06-16
NEUSOFT MEDICAL SYST CO LTD
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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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[0062] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of the embodiments of this application, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0063] The inventors of the present invention have found through research that in the prior art, the radiation dose adjustment of CT equipment is limited, and it is difficult to realize the rapid adjustment of the radiation dose. The reason is that for the CT tube that emits X-rays, The error between the actual tube current and the mA set value is elimi...
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The embodiment of the invention discloses a method for controlling the filament current in a CT bulb. The method includes: detecting the current tube current of the CT tube as the mA feedback value; calculating the difference between the mA set value and the mA feedback value as the error value; in response to the error value being greater than the first error threshold, the current filament The current is set to a target current upper limit; in response to the error value being less than a second error threshold, the current filament current is set to a target current lower limit; wherein the target current upper limit is greater than the target current lower limit value, the first error threshold is greater than 0, and the second error threshold is less than 0. Through the technical solution provided by the invention, the change speed of the actual tube current can quickly follow the change of the mA set value, thereby realizing the rapid adjustment of the radiation dose. In addition, the embodiment of the present invention also provides a device for controlling the filament current in the CT 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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IPC IPC(8): H05G1/34
CPCH05G1/32A61B6/032H05G1/26H05G1/34H05G1/08H05G1/085H05G1/265H05G1/30
Inventor 蒋哲文
Owner NEUSOFT MEDICAL SYST CO LTD