X-ray radiation field indicating method, beam limiting device and medical X-ray photographic equipment

Abstract

The invention discloses an X-ray radiation field indicating method, a beam limiting device and medical X-ray photographic equipment. The beam limiting device comprises at least one beam limiting body and a plurality of lasers, wherein the beam limiting body is used for determining a radiation field of an X-ray on a preset projection plane; an indicating area is surrounded by projection (on the preset projection plane) of projecting lines of the plurality of lasers; and the indicating area is overlapped with the radiation field. As the laser has little heat radiation, the temperature inside the beam limiting device is prevented from being excessively risen, thereby being beneficial for ensuring that the internal temperature is kept in a safe range, and the system stability is improved; and meanwhile a completely sealed shell can be conveniently adopted to prevent radiation leakage better.

Description

technical field [0001] The invention relates to the field of medical X-ray photography systems, in particular to an X-ray beam limiter. Background technique [0002] Existing medical X-ray photography systems generally use thermally luminescent halogen lamps as light sources, and generate light fields simulating X-ray irradiation fields through the halogen lamps. The luminous efficiency of the halogen lamp is 17-33lm / W. To generate the illuminance required to simulate the light field of the X-ray irradiation field, at least a 100W halogen lamp is required, which leads to the following problems: [0003] a) Most of the electrical energy of the halogen lamp is converted into heat energy, and generally only less than 2% of the halogen lamp flux can be used. The heat and unused light will increase the internal temperature of the device simulating the X-ray irradiation field, affecting the stability of the entire system and causing serious damage. As a result, it is difficult to...

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Problems solved by technology

[0003] a) Most of the electrical energy of the halogen lamp is converted into heat energy, and generally only less than 2% of the halogen lamp flux can be used. The heat and unused light will increase the internal temperature of the device simulating the X-ray irradiation field, affecting the stability of the entire system and causing serious damage. As a result, it is difficult to lower the temperature of the housing below the safety standard, or the halogen lamp has to be placed outside the device that is relatively independent of the X-ray irradiation field, but this leads to a gap in the lead plate layer that prevents radiation leakage;

[0004] b) Relatively low luminous efficiency and luminous flux utilization rate lead to waste of energy;

[0005] c) The high current caused by high power also leads to an increase in the cost of safety protection;

[0006] d) Since the halogen lamp cannot be directly located at the X-ray focus, reflectors are often required to realize this process, resulting in a complicated device

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