CN2319918Y - Cathode shifting X-ray tube - Google Patents

Abstract

The utility model discloses an X-ray tube, composed of an anode which is sealed in a vacuum glass casing, an electron bunch screen, a cathode shift disk, etc. A cathode which is fixed on the cathode shift disk and is opposite to an anode target surface can rotate together with the cathode shift disk. A motor stator is arranged outside the vacuum glass casing. The cathode shifting disk is a rotor. The shape of the anode target surface is different according to the different requirements of the radiation direction of an X-ray. When the X-ray is required to radiate towards the center, the anode target surface presents an arc shape or a full circumferential ring shape; when the X-ray is required to radiate towards the periphery, the anode target surface presents a cone shape. The utility model can cause a light source to move, provide wide sections with X-ray light sources, and obtain inward or outward X-ray beam with different ranges and various classes of radial planes according to the shift section of the cathode. The utility model is used for enhancing scanning speed in a CT machine.

Description

X-ray tube with shift cathode

The utility model belongs to a kind of X-ray pipe.

No matter existing X-ray pipe is applied on the Medical Devices or is applied on the industrial detecting devices, its structure all is relative with the negative electrode that filament is housed by plate target, be encapsulated within the glass bulb of a vacuum, send electron beam after giving the cathode filament making alive, bombardment is on the anode target surface, form X ray, penetrate from anode sides, be radiated on tested human body or the object, its negative electrode of X-ray pipe of this kind structure all is fixed, therefore the face of its irradiation is limited, and light source can only be single-point stationary radiation source.Because the X-ray light source point is fixing, makes the application of X-ray be subjected to serious limitation.In the more application of medical domain except that roentgenotherapia and general perspective is to comprise the shooting of the human body of CT scan device (CT machine).In common X-ray tomography shooting,, adopt X-ray light source and photographic plat or detector to do reverse sync displacement or rotation synchronously in the same way in order to get rid of the fixing overlapping of unnecessary position.Such operation requires the X-ray pipe that the arcuate movement of certain angle will be arranged, and incident is filament supply line and several ten thousand high-voltage power-lines to the hundreds of thousands volt that require to supply with also having of X-ray light source turn simultaneously the negative electrode heating.The problem of bringing is, the shooting cycle of causing because of it is dumb is long, the complete machine heaviness, and volume is big, cost height, big energy-consuming; And the X ray accumulative total exposure that irradiated patient is accepted is big.In the shooting of CT machine, remove the precision height, outside swing angle was big, identical because of operating, the problem of existence also was same; And also having distinct issues is that multilayer just obtains macroscopical impression because CT often makes a video recording, so irradiation time is long, need to realize with the shortening cycle for this reason, therefore but its sweep speed does not increase always, makes development preceding four generation CT machines so far not diagnose the disease of the cardiovascular system that should make a video recording in the time at millisecond always.Application at industrial X-ray is also limited to because of this structure of X-ray pipe.

The purpose of this utility model is to provide a kind of X-ray that can be beneficial to use, and makes the X-ray pipe of the shift cathode formula that the X-ray light source can move.

X-ray pipe of the present utility model, its structure are that anode combination and cathode combination two large divisions are arranged in the glass shell of vacuum.The anode combination has: target surface, target body, target chamber, target stake and cooling water inlet/outlet pipe; Cathode combination has: shift cathode dish, negative electrode, electron bunch screen, spring brush sheet, power slip rings, shift cathode dish axostylus axostyle, cathode power, power supply lead wire and the outer motor stator of glass shell, shift cathode dish can turns and be can be used as the rotor of any type of common motor.Negative electrode (filament) be contained on the shift cathode dish with the anode target surface relative to and move with the shift cathode dish.Anode target surface shape is different and different with the radiation direction that requires X-ray, when requiring X-ray to intracardiac radiation; Curved or full week of anode target body is annular, and target surface is the interior synform conical surface, and when requiring X-ray to the periphery radiation, the anode target surface is the outer synform conical surface.

Be described in detail content of the present utility model below in conjunction with accompanying drawing.

Fig. 1 is the X-ray tube with shift cathode structural representation of the utility model to periphery radiation X-ray;

Fig. 2 is negative electrode of the present utility model and boundling screen partial structurtes schematic diagram;

Fig. 3 is the principle schematic of the utility model to the complete all X-rays of periphery radiation;

Fig. 4 is the structural representation of the utility model to the X-ray tube with shift cathode of intracardiac radiation X-ray;

Fig. 5 is the principle schematic of the utility model to intracardiac radiation X-ray;

Among the figure: [1] target surface, [2] target body, [3] target chamber, [4] target stake, [5] cooling water pipe, [6] negative electrode (filament), [7] electron bunch screen, [8] spring brush sheet, [9] shift cathode dish, [10] copper slip ring, stake at the bottom of [11] axostylus axostyle, [12] heater lead, [13] motor stator, [14] glass shell, [15] cooling water gateway, [16] anode base plate, [17] support wheel bearing, [18] drive sheave, [19] motor rotor, [20] rotor bearing, [21] rotor shaft, [22] rotor cloche, [23] support wheel, [24] support wheel axostylus axostyle.

Further narrate content of the present utility model with embodiment below.

Embodiment 1, to the X-ray tube with shift cathode of periphery radiation X-ray.

As shown in Figure 1, anode combination and cathode combination two parts are housed in vacuum glass shell [14].Anode combination has: target surface [1] is the outer synform conical surface, target body [2], target chamber [3], target stake [4], and be contained in cooling water pipe [5] in the target stake [4]; Cathode combination has: rotary shift cathode dish [9], be contained in the cathode filament [6] on the shift cathode dish [9], electron bunch screen [7] places the both sides of cathode filament [6], shift cathode dish [9] is installed at the bottom of the axostylus axostyle in the stake [11] by inside and outside slip ring [10], the supply lines of cathode filament [6] joins by slip ring [10] and through lead-in wire [12] and power supply, stator [13] is housed outside vacuum glass shell [14], and the shift cathode dish is originally as rotor, and the position of stator [13] is relative with shift cathode dish [9].When shift cathode dish [9] rotated, dress cathode filament [6] thereon was with its rotation, because anode target surface [1] is the outer synform conical surface, so the X-ray that electron bombard takes place all is to extraradial.

Embodiment 2, to the X-ray tube with shift cathode of intracardiac radiation X-ray.

As shown in Figure 4, it in the glass shell [14] vacuum chamber, the metallic anode plate [16] of its inherent arc or complete all annulars goes up with an anode target body [2] of being made by high temperature metallic material (as tungsten), and a special angle is arranged with base plate, (as 12 °-40 °), relative with target surface [1] have a shift cathode dish [9], one or more negative electrodes (filament) [6] are housed on the shift cathode dish [9], shift cathode dish [9] is the common motor of forming by the motor rotor [19] of cloche [22] inboard and outside motor stator [1 3], via rotor shaft [21] with drive sheave [18] and drive and rotate, so negative electrode [6] changes the position with the turn of shift cathode dish, always and remain on the position of the circle relative with annulus anode target surface.Electron bunch screen [7] places negative electrode [6] both sides, in order to about beam electrons, improves ray efficient.Electron radiation after cathode filament energising heating if be added with corresponding high voltage simultaneously between plate target [2] and negative electrode [6], produces electric current, then produces X-ray on the relative anode target surface of the slit mouth of electron bunch screen [7].Because of its target surface is the interior synform conical surface, so the X-ray that produces is inside radiation.When changing the position, then will make the displacement of X-ray point,, then on target surface, produce the X-ray light beam of any angle when the turn continuously of the moving negative electrode (filament) of shift cathode dribbling when [9] turn of shift cathode dish.Shift cathode dish [9] relies on the support of support wheel [23], support wheel axostylus axostyle [24] and support wheel bearing [17].The support of target displacement dish can have various ways, can be mechanical type, also can be magnetic-type (as electromagnetic levitation type etc.).Generation makes the shift cathode moving power that spirals also various ways can be arranged, and all in vacuum chamber, or shift cathode dish itself grades with the rotor portions of motor as motor.The negative high voltage power source of the heating power supply of cathode filament and X-ray tube cathode is by being contained in the slip ring [10] on the shift cathode dish [9], is fixed on the elasticity brush sheet [8] of glass shell, and filament supply lead-in wire [12] is supplied with by external power.

X-ray tube with shift cathode of the present utility model can make light source move, and wide district X ray light source is provided, Can be with requiring or purposes difference and camber or annular, thus can obtain difference with the displacement interval of negative electrode All kinds of sagittal planes of scope are main to intracardiac or centripetal extraradial X-ray bundle. This kind X-ray tube is used In the CT machine, can greatly improve sweep speed, make CT can be used for the imaging of angiocardiopathy, and because The turn of the utility model shift cathode dish can be regulated and control by external circuit, so speed is controlled, getting the location, angle can Control, very convenient. Simultaneously, the utility model also have energy-efficient, reduce the complete machine cost, improving can Good by property and cooling condition, long service life, measured body is subjected to the exposure of x-ray little etc. multiple Advantage.

Claims (6)

1, a kind of glass bulb, anode combination and cathode combination of including is at interior X-ray tube with shift cathode, it is characterized in that also containing in the cathode combination of this X-ray tube with shift cathode can turn the shift cathode dish, negative electrode is contained on the shift cathode dish, relative with the anode target surface, motor stator is equipped with in the glass bulb outside, and anode target surface shape is different and different with the radiation direction that requires X-ray, when requiring X-ray to intracardiac radiation, curved or full week of anode target body is annular, and target surface is the interior synform conical surface; When requiring X-ray to the periphery radiation, the anode target surface is the outer synform conical surface.

2, X-ray tube with shift cathode as claimed in claim 1 is characterized in that said negative electrode is contained in to be meant on the shift cathode dish one or more negative electrodes are housed on the shift cathode dish.

3, X-ray tube with shift cathode as claimed in claim 1 or 2 is characterized in that the turn of said shift cathode dish has two kinds of situations:

A. this stator as rotor and glass bulb outside of shift cathode dish is formed common motor;

B. the shift cathode dish rotates via the driving of rotor shaft and driving sheave by the motor rotor of glass bulb inboard and the common motor of the composition of the stator outside the glass bulb.

4, X-ray tube with shift cathode as claimed in claim 1 is characterized in that the supporting way of said shift cathode dish can have various ways: a. mechanical type: rely on support wheel, support wheel axostylus axostyle and support wheel bearings; B. magnetic-type: magnetic suspension is supported.

5, X-ray tube with shift cathode as claimed in claim 3, it is characterized in that said generation makes the power of shift cathode dish displacement that multiple mode can be arranged: a. motor all is located in the vacuum chamber; B. shift cathode dish itself is with motor rotor, and the vacuum glass shell is equipped with motor stator outward.

6, X-ray tube with shift cathode as claimed in claim 2 is characterized in that the heating power supply of said negative electrode and the negative high voltage power source of X-ray tube with shift cathode negative electrode are to be supplied with by external power by being contained in the slip ring on the shift cathode dish, the brush sheet that is fixed on glass shell and filament supply lead-in wire.

Images