X-ray tube, medical imaging apparatus, and X-ray tube manufacturing method

Abstract

The invention provides an X-ray tube, at least one side surface, opposite to an electron emitter, of a cathode head is coated with a metal coating, and the vacuum work function of the metal coating material is greater than the vacuum work function of the cathode head material; and / or the melting point of the metal coating material is higher than 2600 DEG C, and the yield strength of the metal coating material is higher than 550 MPa. According to the X-ray tube provided by the invention, continuous high-voltage sparking of the cathode head of the X-ray tube can be inhibited; the melting point of the metal coating material is higher than 2600 DEG C, the yield strength of the metal coating material is higher than 550 MPa, the metal coating can protect the surface of the cathode head from being damaged when high-voltage sparking occurs to the cathode head, continuous sparking caused by the fact that the surface roughness of the cathode head is increased due to high-voltage sparking is avoided, and normal use of the X-ray tube is facilitated. The invention further provides equipment medical imaging apparatus which comprises the X-ray tube, so that the repair rate of the medical imagingequipment is reduced. The invention further discloses a manufacturing method of the X-ray tube. According to the manufacturing method of the X-ray tube provided by the invention, the high-voltage ignition rate of the X-ray tube can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of medical equipment, and in particular relates to an X-ray tube, medical imaging equipment and a manufacturing method of the X-ray tube. Background technique [0002] X-ray tube is a high-vacuum device that can be used in medical equipment. Its basic principle is to use the thermal emission of the cathode to fly to the anode target surface at high speed under the action of a high-voltage electric field. The target surface is bombarded by electrons to generate X-rays. . In the medical field, X-rays can detect human tissue and help doctors judge the patient's condition. [0003] Existing X-ray tubes are usually under high-voltage working conditions, and the microscopic surface of the cathode head of the X-ray tube is uneven, which makes the surface of the cathode head very prone to field emission, that is, the X-ray tube is very prone to high-voltage sparking, high-voltage sparking It will destroy the surfa...

AI Technical Summary

Problems solved by technology

[0003] Existing X-ray tubes are usually under high-voltage working conditions, and the microscopic surface of the cathode head of the X-ray tube is uneven, which makes the surface of the cathode head very prone to field emission, that is, the X-ray tube is very prone to high-voltage sparking, high-voltage sparking It will destroy the surface of the cathode head, which will increase the roughness of the surface of the cathode head, and then lead to a vicious cycle of continuous high-voltage ignition, which is not conducive to the use of X-ray tubes

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