A kind of automatic exposure control method and device and automatic exposure system

Abstract

The embodiment of the invention discloses an automatic exposure control method, applied to an X-ray machine. The method comprises the following steps: sending initial tube voltage and initial tube current to a high voltage generator, so that the high voltage generator emits X rays according to the initial tube voltage and the initial tube current, and exposure begins; detecting feedback voltage generated by an ionization chamber, thus obtaining first comparison voltage; acquiring reference voltage when the first comparison voltage is greater than or equal to sampling voltage; further detectingfeedback voltage generated by the ionization chamber, thus obtaining second comparison voltage; when the second comparison voltage is greater than or equal to the reference voltage, switching off thehigh voltage generator, and thus exposure stops. Thus, the reference voltage is set according to the practical exposure process, so that the setting of the reference voltage is more reasonable, the accuracy in controlling automatic exposure is guaranteed, an exposure image with ideal gray scale is obtained, the stable and reliable quality of the exposure image is guaranteed, and therefore, the situation that the exposure is insufficient or excessive existing due to setting of the reference voltage by virtue of experience in the prior art is avoided.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to an automatic exposure control method and device and an automatic exposure system. Background technique [0002] In X-ray machines, the purpose of using automatic exposure control (AEC) technology is to obtain images with stable and reliable quality. For the direct digital X-ray photography system (DR system), under the condition of certain X-ray quality, the imaging gray scale of the flat panel detector is proportional to the X-ray input dose of the detector. In addition, the imaging grayscale of the flat panel detector is also related to the size of the tube voltage and the attenuation of the attenuation object. In the case of the same thickness of the attenuator, the imaging grayscale of the flat panel detector gradually increases with the increase of the tube voltage. In the case of the same tube voltage, the thicker the attenuation object, the greater the attenuat...

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Problems solved by technology

[0004] In view of this, the present invention provides an automatic exposure control method and device and an automatic exposure system, which can solve the problem in the prior art that the image quality cannot be guaranteed to be stable and reliable due to the inability to accurately set the X-ray dose reaching the detector. question

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