CN2605027Y - Multi-lobe collimator - Google Patents

Abstract

Multi-leaf collimator comprises: a tungsten slice assembly superimposed by dozens of tungsten slices 2 is separately provided on the both sides of the interior of a collimating device 1, the higher and lower long edge of every piece of the tungsten slice 2 are separately covered in a guide slot 14 in a guide 3, the tungsten slice 2 can slide in the guide slot 14, a intermediate region of 15 is a radiation through region surrounded by the opposite ends of the tungsten slice 2 of the both sides, which is characterized in that the guide 3 is a circular arc guide, the space of the guide slot 14 equals and the sizes, structures and shapes of every tungsten slice are the same; the exterior side of every tungsten slice has a gap 16 of the same position, shape and size, the space of the gap 16 is arranged an electrical machine 11 and the rotatable parts. The rotation of the electrical machine 11 drives an electrical machine axis 13 and a screw mandrel 6 to rotate so that enable the tungsten 2 moves straightly towards the horizontal direction; and is further characterized of simple and compact structure, great shrink of the external dimension, lower craft difficulty and easy to manufacture in batches.

Description

Multi-diaphragm collimator

Technical field:

In radiotherapy system; see Fig. 9; medical electronic linear accelerator is to be the standing wave type linear accelerator of microwave power source with the magnetron; it mainly comprises: accelerating tube, microwave system, manipulator, beam transfer and colimated light system, vacuum system, thermostatted water cooling system and control protection system; this utility model relates to the parts in medical electronic linear accelerator--colimated light system, relates in particular to multi-diaphragm collimator.

Background technology:

In the monofocal multi-diaphragm collimator of prior art, the design of its guide rail, each producer all adopts flat guide 3A distribution form at present, as shown in Figure 1 and Figure 2.In order to realize multi-diaphragm collimator monofocal function, tungsten sheet 2A arranges and makes guide-track groove 3A is the unequal-interval form, each tungsten sheet 2A is for uniform thickness is not wide, each sheet of physical dimension differs, this has just increased tungsten sheet 2A processing technique difficulty greatly, be difficult to carry out mass production processes, cause tungsten sheet 2A machining accuracy to reduce, the radiation leakage amount increases.Tungsten sheet difficulty of processing becomes the principal element of such production development of restriction.

Summary of the invention:

The purpose of this utility model is to provide a kind of multi-diaphragm collimator, multi-diaphragm collimator of the present utility model is opened under the identical situation of wild parameter at monofocal function and physics, the designs simplification compactness, and overall dimensions dwindles greatly, technology difficulty reduces, and is easy to produce in batches make.

Multi-diaphragm collimator comprises: the right and left has one respectively by tens tungsten sheets, 2 eclipsed tungsten sheet assemblys in collimator body 1, the long up and down limit of every tungsten sheet 2 is enclosed within respectively in the guide-track groove 14 on the guide rail 3, upper and lower guide rail 3 positions are relative, the many guide-track grooves 14 that axially parallel is arranged on each guide rail 3, tungsten sheet 2 can slide in guide-track groove 14, the zone line 15 that surrounds by the tungsten sheet 2 relative ends of the right and left for lonizing radiation by the zone;

See Fig. 3,4,5, it is characterized in that: guide rail 3 is arc guide rail, and guide-track groove 14 spacings equate that each tungsten sheet 2 size is identical with planform;

See Fig. 6, have the position opening identical 16 in the outer end of every tungsten sheet 2 with geomery;

See Fig. 7, the space of opening 16 is provided with motor 11 and drive disk assembly.

Multi-diaphragm collimator of the present utility model has adopted three typical structures as follows:

One, is illustrated in figure 3 as the arc guide rail 3 back tungsten sheets 2 arrangement sketch maps that this utility model multi-diaphragm collimator adopts.Wherein radioactive source 18.

Construction features and superiority: the application of this structure equates tungsten sheet guide-track groove 14 spacings, each tungsten sheet 2 size is identical with version, thereby make tens tungsten sheets 2 become the same structure form by single-piece different structure form, tungsten sheet 2 excessively is batch process by single-piece production, the variation of matter has taken place in manufacturing process, realize stable tungsten sheet 2 qualities of production, improved machining accuracy and interchangeability, reduced tungsten sheet 2 manufacturing costs.

Two, tungsten sheet 2 new structures---opening tungsten sheet 2 and general idea

Novel tungsten sheet 2 structures of multi-diaphragm collimator as shown in Figure 5, tungsten sheet opening degree of depth m is: $m=L-(\frac{\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="Y0323344300062.png,Y0323344300081.png"\; state="\{\{state\}\}">W</figure-callout>}}{2}+a)+\mathrm{\&delta;}$ In the formula: L is a tungsten sheet total length

W is the launched field physical length

A crosses middle distance for the tungsten sheet

δ is for reserving the adjusting play

Construction features and superiority:

Use the new structure of tungsten sheet opening, drive disk assemblies such as motor are sunk to its interior location, the staggered design in locus makes the volume of multi-diaphragm collimator that fundamental change take place, and structure is very compact.

(1), the multi-diaphragm collimator length dimension shortens significantly, shorten 100 than product overall length dimension of the same type surplus millimeter, the contour length amount of decrease reaches 16%.

(2), guarantee and improved the optimum length that tungsten sheet guide rail cooperates that make the stable and reliable operation of tungsten sheet, the resistance of motion is effectively controlled.

(3), to greatest extent alleviated tungsten sheet weight, made the multi-diaphragm collimator structure light and handy.

Three, multi-diaphragm collimator tungsten sheet dragging motor 11 mounting structures

Motor 11 and screw mandrel 6 mounting structures are as shown in Figure 7.

Construction features and superiority:

(1), screw mandrel 6 adopts the direct-connected mode of openings with motor shaft 13, shortens the driving member axial dimension to greatest extent.

(2), screw mandrel 6 and motor 11 drive disk assemblies can whole independent dismountings, installation and maintenance are very convenient.

(3), containment type motor mount 4 has stronger radiating effect, solved the heat dissipation problem that adds up to 20～30 motors well, makes its working stability.

Description of drawings:

Fig. 1: the collimator of prior art adopts its tungsten sheet of flat guide to arrange sketch map.

Fig. 2: the collimator of prior art adopts the flat guide sketch map.

Fig. 3: the arc guide rail tungsten sheet that this utility model multi-diaphragm collimator adopts is arranged sketch map.

Fig. 4: the arc guide rail sketch map that this utility model multi-diaphragm collimator adopts.

Fig. 5: the tungsten sheet guide rail structure figure that this utility model multi-diaphragm collimator adopts.

Fig. 6: the opening tungsten sheet sketch map that this utility model multi-diaphragm collimator adopts.

Fig. 7: the tungsten sheet electric motor mounting structure sketch map that this utility model multi-diaphragm collimator adopts.

Fig. 8: this utility model multi-diaphragm collimator structure vertical view.

Fig. 9: the medical electronic linear accelerator sketch map of prior art has colimated light system 1A on it.

Each label is as follows among the figure: collimator body 1, tungsten sheet 2, guide rail 3, motor mount 4, circuit control panel 5, screw mandrel 6, nut 7, bearing 8, shaft bearing plate 9, axle sleeve 10, motor 11, press strip 12, motor shaft 13, guide-track groove 14, zone line 15, breach 16, screw mandrel groove 17, radioactive source 18

The specific embodiment:

See Fig. 8, this utility model multi-diaphragm collimator structure vertical view.Multi-diaphragm collimator comprises: the right and left has one respectively by tens tungsten sheets, 2 eclipsed tungsten sheet assemblys in collimator body 1, the long up and down limit of every tungsten sheet 2 is enclosed within respectively in the guide-track groove 14 on the guide rail 3, upper and lower guide rail 3 positions are relative, the many guide-track grooves 14 that axially parallel is arranged on each guide rail 3, tungsten sheet 2 can slide in guide-track groove 14, the zone line 15 that surrounds by the tungsten sheet 2 relative ends of the right and left for lonizing radiation by the zone;

See Fig. 3,4,5, it is characterized in that: guide rail 3 is arc guide rail, and guide-track groove 14 spacings equate that each tungsten sheet 2 size is identical with planform;

See Fig. 6, have the position opening identical 16 in the outer end of every tungsten sheet 2 with geomery;

See Fig. 7, the space of opening 16 is provided with motor 11 and drive disk assembly; Drive disk assembly comprises: a rhizoid bar groove 17 is arranged in the outer end of every tungsten sheet 2, be with a rhizoid bar 6 in the screw mandrel groove 17, screw mandrel 6 outer ends are enclosed within the nut 7, nut 7 outer ends are fixedly connected on motor shaft 13 ends, rotating band galvanic electricity arbor 13 and screw mandrel 6 by motor 11 rotate, and make tungsten sheet 2 make the horizontal direction straight line and move; Motor 11 is fixed in the motor mount 4, and the bearing 8 of motor is fixed in the shaft bearing plate 9, and axle sleeve 10 is fixed in the motor mount 4, and press strip 12 is pressed in the outer end of motor 11.

Operation principle: see Fig. 7, the outer end of every tungsten sheet 2 connects a motor 11, and motor 11 is fixed in the motor mount 4.The circuit board of controlling when computer 5 sends instruction, start motor 11, motor 11 rotates, motor shaft 13 rotates, driving screw mandrel 6 rotates, the tungsten sheet 2 of screw mandrel groove 17 is moved in the horizontal direction, surrounded zone line 15 by every tungsten sheet near the end at middle part, this zone 15 is consistent with the focus shape that the needs that computer memory is store carry out radiation cure.

Claims (2)

1, multi-diaphragm collimator comprises: the right and left has one respectively by the eclipsed tungsten sheet of tens tungsten sheets (2) assembly in collimator body (1), the long up and down limit of every tungsten sheet (2) is enclosed within respectively in the guide-track groove (14) on the guide rail (3), upper and lower guide rail (3) position is relative, the many guide-track grooves (14) that axially parallel is arranged on each guide rail (3), tungsten sheet (2) can slide in guide-track groove (14), the zone line (15) that surrounds by the relative end of tungsten sheet (2) of the right and left for lonizing radiation by the zone; It is characterized in that:

Guide rail (3) is an arc guide rail, and guide-track groove (14) spacing equates that each tungsten sheet (2) size is identical with planform;

Have the position opening identical (16) in the outer end of every tungsten sheet (2) with geomery;

The space of opening (16) is provided with motor (11) and drive disk assembly.

2, multi-diaphragm collimator according to claim 2, it is characterized in that: drive disk assembly comprises: a rhizoid bar groove (17) is arranged in the outer end of every tungsten sheet (2), be with a rhizoid bar (6) in the screw mandrel groove (17), screw mandrel (6) outer end is enclosed within the nut (7), nut (7) outer end is fixedly connected on motor shaft (13) end, rotating band galvanic electricity arbor (13) and screw mandrel (6) by motor (11) rotate, and make tungsten sheet (2) make the horizontal direction straight line and move; Motor (11) is fixed in the motor mount (4), and the bearing of motor (8) is fixed in the shaft bearing plate (9), and axle sleeve (10) is fixed in the motor mount (4), and press strip (12) is pressed in the outer end of motor (11).

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