CN202409871U - Adjusting mechanism for flattening filter of medical linear accelerator - Google Patents

Abstract

The utility model discloses an adjusting mechanism for a flattening filter of a medical linear accelerator, and is characterized in that the adjusting mechanism comprises a primary collimator and a flattening filter, wherein four opposite chutes are arranged in the primary collimator; the flattening filter is tapered and located in a beam outlet hole of the primary collimator; a fixing block used for fixing the flattening filter and the adjusting mechanism is arranged in the primary collimator and connected with the primary collimator through a fixing bolt; four adjusting blocks used for independently adjusting the flattening filter on directions GT and AB are arranged in the primary collimator and connected with the fixing block through adjusting bolts, the adjusting blocks are arranged in the chute, and the contact surface of the adjusting blocks and the flattening filter is a slope. According to the adjusting mechanism for the flattening filter of the medical linear accelerator, an adjusting process is simplified, so that the location is more precise.

Description

Clinac expansion filter governor motion

Technical field

This utility model relates to the accelerator installation technical field, is specifically related to clinac expansion filter governor motion.

Background technology

Clinac is to be used on the biomedicine tumor is carried out radiocurable particle accelerator.Through microwave electron beam is quickened, form high-velocity electrons lines (β ray), produce X ray through high-velocity electron beam bombardment heavy metal target again.In clinical practice, hope that the X ray matter in the radiation field size is even, GB has also been made corresponding requirement to the X ray flatteness, so must use the expansion filter to make the flatteness of ray reach the regulation of GB.In actual application, the expansion filter is an inverted cone, and its tap web should overlap with the central shaft of ray.Because the central shaft position of ray can't confirm in process of production, position that need the expansion filter has certain adjustability, to be applicable to the change in location of clinac ray center axle.Traditional technical scheme is to use the annulus of a band conical surface as governor motion; This annulus also has the fixedly effect of expansion filter concurrently simultaneously; When needs carry out position adjustments, need unclamp the hold-down screw of both direction, again according to the scanning result of detecting instrument trip bolt in sequence.Because locating ring is as a whole, thus when adjusting position, must scanning repeatedly regulate, succinct inadequately.

In order to solve above-mentioned deficiency of the prior art, the utility model provides a kind of new solution.

The utility model content

This utility model technical problem to be solved is: a kind of clinac expansion filter governor motion is provided, and this clinac expansion filter governor motion is simplified adjustment process, makes the location more accurate.

For reaching the foregoing invention purpose, the technical scheme that this utility model adopted is: a kind of clinac expansion filter governor motion is provided, has it is characterized in that: comprised example of primary collimator and expansion filter; Be provided with four relative chutes in the said example of primary collimator; The tapered shape of said expansion filter is positioned at example of primary collimator and goes out beam hole; Be provided with the fixed block that is used for fixing expansion filter and governor motion in the said example of primary collimator and pass through hold-down screw and be connected with example of primary collimator; Be provided with in the said example of primary collimator and be used for four regulating blocks of independent regulation expansion filter in GT and AB direction, and be connected with fixed block through adjustment screw, regulating block is located in the chute, and is the inclined-plane with expansion filter contact surface.

Preferably, said chute matches with regulating block.

Preferably, said expansion filter tapered slope matches with the regulating block inclined-plane.

Preferably, said regulating block and adjustment screw formation two is overlapped independently governor motion.

In sum, a kind of clinac governor motion that this utility model provided is simplified adjustment process, makes the location more accurate.

Description of drawings

Fig. 1 is a clinac expansion filter governor motion master cutaway view;

Fig. 2 is a clinac expansion filter governor motion vertical view;

Fig. 3 removes the vertical view of fixed block for clinac expansion filter governor motion.

Wherein, 1, example of primary collimator; 2, fixed block; 3 hold-down screws; 4, regulating block; 5 adjustment screw; 6, expansion filter; 7, chute.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of this utility model is done detailed explanation.

-as shown in the figure, this clinac expansion filter governor motion comprises example ofprimary collimator 1 andexpansion filter 6; Be provided with fourrelative chutes 7 in the said example ofprimary collimator 1; Saidexpansion filter 6 tapered shapes are positioned at example ofprimary collimator 1 and go out beam hole; Be provided with thefixed block 2 that is used forfixing expansion filter 6 and governor motion in the said example ofprimary collimator 1 and pass through hold-down screw 3 and be connected with example ofprimary collimator 1; Be provided with in the said example ofprimary collimator 1 and be used for fourregulating blocks 4 of independentregulation expansion filter 6 in GT and AB direction, and be connected withfixed block 2 throughadjustment screw 5, regulatingblock 4 is located in thechute 7, and is the inclined-plane withexpansion filter 6 contact surfaces.

In this utility model example ofprimary collimator 1 is changed, it act as and blocks unnecessary ray.Used two groups four independently regulatingblocks 4, and used the inclined-plane formula to regulate,fixed block 2 was opened with regulating block in 4 minutes, can independently carry out the position adjustments of both direction; Formula mechanism in inclined-plane has self-locking performance in addition, the non-displacement after can guaranteeing to regulate; Also can directly calculate the regulated quantity ofadjustment screw 5 according to scan-data.

During adjusting, be installed on the regulatingblock 4 in the example ofprimary collimator 1,expansion filter 6 changed in the position that goes out in the beam hole of example ofprimary collimator 1, thereby reach the purpose that coincides with the ray center axle throughadjustment screw 5 adjustings.The regulated quantity ofadjustment screw 5 is then calculated through specific formula by the scanning result of ray detection instrument (like 3 d water tank) again.

In sum, a kind of clinac governor motion that this utility model provided is simplified adjustment process, makes the location more accurate.

Though describe in detail in conjunction with the specific embodiment of accompanying drawing, should not be construed as qualification to the protection domain of this patent to this utility model.In the described scope of claims, various modifications that those skilled in the art can make without creative work and distortion still belong to the protection domain of this patent.

Claims (4)

1. clinac expansion filter governor motion is characterized in that: comprise example of primary collimator (1) and expansion filter (6);

Be provided with four relative chutes (7) in the said example of primary collimator (1); The tapered shape of said expansion filter (6) is positioned at example of primary collimator (1) and goes out beam hole; Be provided with the fixed block (2) that is used for fixing expansion filter (6) and governor motion in the said example of primary collimator (1) and pass through hold-down screw (3) and be connected with example of primary collimator (1);

Be provided with in the said example of primary collimator (1) and be used for four regulating blocks (4) of independent regulation expansion filter (6) in GT and AB direction; And be connected with fixed block (2) through adjustment screw (5); Regulating block (4) is located in the chute (7), and is the inclined-plane with expansion filter (6) contact surface.

2. clinac expansion filter governor motion according to claim 1 is characterized in that: said chute (7) matches with regulating block (4).

3. clinac expansion filter governor motion according to claim 1 is characterized in that: said expansion filter (6) tapered slope matches with regulating block (4) inclined-plane.

4. clinac expansion filter governor motion according to claim 1 is characterized in that: said regulating block (4) constitutes two with adjustment screw (5) and overlaps independently governor motion.

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