Series lens image system of electric-controlled fixing diaphragm for X-ray machine

Abstract

Structure of the system comprises correction lens, plane mirror with high reflectance, CCD camera, lens of camera, diaphragm, stepper motor and relevant control software. The arrangement is as follows. Image enhancer is aimed at the correction lens directly. Output image of correction lens is sent to plane mirror with high reflectance. Image reflected by the plane mirror is passed through diaphragm, which is connected to the stepper motor directly. Output of the diaphragm is toward lens of camera. The camera is behind the lens, and video signal output is connected. Operation of the stepper motor is controlled by computer software. The advantages of the invention are: simple structure, low cost, good stability of system, obtained image with high S / N ratio and high resolution.

Description

technical field [0001] The invention belongs to the technical field of medical equipment and relates to an image pickup part of an RF X-ray machine. Background technique [0002] The optical imaging system is the image preprocessing and image acquisition unit of the RF X-ray machine using the image intensifier. There are two types of image acquisition: 1. Acquisition of low-dose fluoroscopic images. The fluorescence output by the image intensifier is collected by the camera lens to the CCD chip of the camera; 2. Collect high-dose exposure images. The dose is very high during exposure. The light intensity output by the image intensifier output screen is dozens of times that of perspective. In order to prevent the output saturation of the CCD chip, the camera lens must Add light attenuation equipment before. [0003] At present, there are four modes of image acquisition adopted by the optical imaging system of international mainstream models: 1. Only use the electric aperture...

AI Technical Summary

Problems solved by technology

The disadvantage of using a combination of optical filters and apertures is that the control structure is complex and the cost is high; only using electric apertures has the following problems: 1. In a non-tandem lens system, the controlled aperture is the aperture of the camera lens, but in fact, the camera The best optical point of the lens has a definite position, that is, after adjusting the aperture and focal length, then use the external motor to control and adjust the aperture. Larger changes, affecting image quality

2. In the tandem lens system, the electric aperture is in the parallel light path between the two lenses, and its adjustment will not reduce the optical performance of the camera lens. However, the electrical control and mechanical structure of the electric aperture are complicated, which is harmful to the equipment. The manufacturing process requirements are very high, and the relative cost is high

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