CN201006199Y

CN201006199Y - Digital display radiotheraphy apparatus iso-center error detecting instrument

Info

Publication number: CN201006199Y
Application number: CNU2007200192331U
Authority: CN
Inventors: 张锋; 侯勇; 房吉旺; 宋志国; 隋俊峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-09
Filing date: 2007-03-09
Publication date: 2008-01-16
Anticipated expiration: 2017-03-09

Abstract

The utility model discloses a central error detecting instrument of a digital display radio therapy apparatus, a support frame is fixed on the top of the rear end of the base, a steel cover is fixed on the support frame, four sensors that the long axis are in the same vertical surface are fixed in the steel cover in the 0 degree, 90 degrees, 180 degrees and 270 degrees, the sensor head of the offset sensor are turned to the horizontal axis of the steel cover and the distance to the horizontal axis are the same, the top surface of the steel cover is provided with a four-in-one digital display chip, every digital display chip is connected with the respective offset sensor, the lower surface of the adapter board is provided with a support pole perpendicular with the adapter board, the lower end of the support pole is fixed with a corner type cross bar, the front end of the cross bar is in a sharp shape and it is arranged at the rotation central point of the instrument frame. The detecting instrument could display the error of the rotation center of the accelerator instrument frame more accurate and more directly, the utility model has the advantages that use convenience, easy operation, detecting accuracy and direct display.

Description

Errors of centration detectors such as digital display type radiotherapy apparatus

Technical field:

This utility model relates to a kind of device that is used for the error-detecting of radiotherapy apparatus frame central.

Background technology:

Accelerator, cobalt ⁶⁰Therapy apparatuss etc. are a kind of radiotherapy equipments that is used for oncotherapy, its degree of accuracy and performance have directly determined final radiotherapeutic effect, under the situation about particularly update, new technique constantly being used, also more and more higher to the performance and the required precision of radiotherapy apparatus at current radiotherapy technology.Therefore, the mechanical performance and the precision of assurance and raising radiotherapy apparatus are to carry out the basis of radiotherapy, so the correction of frame and collimator is vital.

At present, domestic calibration steps for the radiotherapy apparatus frame is fairly simple.For example, during calibration accelerator frame center of rotation, will speed up the device frame and be adjusted to zero-bit, the major axis parallel pin of a major axis with bed is fixed on the head of a bed, and the move left and right therapeutic bed, the center of collimator " ten " word line projection and needle point are overlapped, the re-adjustment frame is respectively to 90 °, 270 ° positions, the lifting therapeutic bed also makes the center of collimator " ten " word line projection and needle point overlap, and this moment, tip position was exactly the locus of frame center of rotation.If when occurring not overlapping, error has just appearred, this error be by the setting angle of the installation site of collimator " ten " word line position, launched field lamp, illuminator, frame when 90 °, the 270 ° positions, a kind of synthetic error that rotation error caused of the sagging and frame self of collimator.For the affirmation of this error, majority is with the center of perusal collimator " ten " word line projection and the offset distance of needle point, estimates isocentric error size, perhaps measures the size that its offset distance is confirmed its error with ruler.In addition, some other calibration steps and instruments are arranged also, but the method for these verifications and instrument in various degree existence size of display error directly perceived all, and have the shortcoming that increases or dwindle error because of anthropic factor.

Summary of the invention:

This utility model has remedied existing method and instrument, show that for error size directly perceived and verifier estimates factor of judgment and produce the deficiency of error, a kind of new instrument of radiotherapy apparatus verification is provided, this instrument has the function of the various radiotherapy apparatus frame center of rotation errors of checking, and can demonstrate its error size intuitively in the mode that numeral shows.

This utility model is achieved through the following technical solutions:

This detector comprises " ∏ " type base 1 that is fixed on the therapeutic bed, upper surface is the carriage 5 of lower semi-circular, cylindrical steel sleeve 8 and be fixed on adaptation board 13 on the accelerator collimator, be respectively equipped with orthogonal two horizon rules 2 of major axis on the base 1 and be three horizontal adjustment screws 3 that triangle is placed, carriage 5 be fixed on base 1 rear end above, steel bushing 8 the latter halfs be fixed on the carriage 5 lower semi-circular faces and faying face corresponding, the major axis of steel bushing 8 is parallel with the major axis of base 1, major axis all four displacement transducers 7 on same vertical is pressed 0 ° respectively, 90 °, 180 °, 270 ° fixed-site is in steel bushing 8, the sensing head of displacement transducer 7 all equates towards the horizontal middle spindle of steel bushing 8 and to the distance of horizontal middle spindle, the end face horizontal positioned of steel bushing 8 has four to be the digital display chip 9 of one, each digital display chip 9 is connected with separately displacement transducer 7, the center of adaptation board 13 has square breach 14, be fixed with support bar 12 in the lower surface off-centre of adaptation board 13 perpendicular to adaptation board 13, be fixed with turning formula cross bar 10 in the lower end of support bar 12, cross bar 10 is provided with scale 11, the front end of cross bar 10 is pointed, it is arranged on the rotary middle point of frame, by mobile therapeutic bed, cross bar 10 is inserted in the steel bushing 8, and make the major axis of cross bar 10 consistent with the central shaft of steel bushing.

Every limit is provided with two fixed screws 4 on the downward flanging of the both side edges of base 1, and fixed screw 4 is used for base 1 is fixed on therapeutic bed.

When external force makes that the sensing head of displacement transducer 7 produces displacement, corresponding digital display chip 9 can show the shift length of each displacement transducer 7, the error of center of rotation of frame that can will speed up device is more accurate, show intuitively, therefore this detector has easy to use, simple to operate, verification is accurate, the characteristics of intuitive display.

Description of drawings:

Fig. 1 is the front view of this utility model base assembly;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the left view of Fig. 1;

Fig. 4 is the front view of this utility model support bar;

Fig. 5 is the right view of Fig. 4;

Fig. 6 is the upward view of Fig. 4.

The specific embodiment:

Below in conjunction with accompanying drawing this utility model is further described:

As Fig. 1-shown in Figure 6, base 1 is " ∏ " type, and every limit is provided with two fixed screws 4 on the downward flanging of the both side edges of base 1, also is provided with two horizon rules 2 on the base 1, and the major axis of two horizon rules is placed and is orthogonal state, to regulate base in X and the planar level of Y-axis; Also be provided with three in addition and be the horizontal adjustment screw 3 that triangle is placed on base 1, fixed placement has carriage 5 on the rear end of base 1 (being the back near stander end), and the upper surface of carriage 5 is a lower semi-circular; The major axis of the major axis of steel bushing 8 and base 1 is parallel shape, and steel bushing 8 the latter halfs and carriage 5 lower semi-circular faces are fixed as one; On the long axis direction of base 1, be decorated with centrage 6; And it is consistent with the major axis of steel bushing 8.With the bottom of four displacement transducers respectively by 0 °, 90 °, 180 °, 270 ° fixed-site in steel bushing 8, all the sensing head of four displacement transducers 7 on same vertical is all towards the horizontal middle spindle of steel bushing 8 for major axis, and the sensing head of each pick off will equate to the distance of steel bushing central shaft; End face on pick off steel bushing 8 has four for digital display chip 9 one, horizontal positioned, and each digital display chip all has signal transmssion line to be connected with separately sensor signal outfan.

Base 1 is put in the rear end of therapeutic bed, the move left and right therapeutic bed, the mid point of collimator " ten " word line projection and the centrage 6 on the base 1 are coincided, move forward and backward therapeutic bed then, the mid point of " ten " word line projection is overlapped all the time with centrage 6 on the base 1, can not horizontally rotate therapeutic bed it is overlapped if do not overlap, so just guarantee that the major axis of this tester is consistent with the major axis of accelerator.Regulate horizontal adjustment screw 3 and eye-level chi 2,, with fixed screw 4 base 1 and therapeutic bed are fixed together at last up to making base 1 on X and the Y-axis plane all till the level.There is a square breach 14 that hollows out at the center of adaptation board 13, and off-centre is fixed with support bar 12 below adaptation board 13, be provided with turning formula cross bar 10 again in the lower end of support bar 12, the front end of cross bar 10 is pointed, and on cross bar 10, be provided with scale, during the frame rotation, the most advanced and sophisticated locus of cross bar 10 is the rotary middle point of frame.

The base 1 that will have a pick off 7, and is aligned and horizontal adjustment by being put on the therapeutic bed according to preceding method, at last itself and bed is fixed.The adaptation board 13 that will have support bar 12 in addition inserts in the slot below the accelerator collimators and is fixed.Frame is placed 0, and this moment, the front tip of cross bar 10 was exactly the rotary middle point of frame.Then lifting and (or) the move left and right therapeutic bed, make the approximate centre bits that are in the steel bushing 8 that has pick off 7 of cross bar 10, again with the bed reach, cross bar 10 is inserted in the steel bushings 8, and makes the major axis of cross bar 10 consistent as far as possible with the central shaft of steel bushing; Cross bar 10 inserts the degree of depth of steel bushings 8, with corresponding the getting final product of scale of defined on the trailing edge of steel bushing 8 and the cross bar 10.

At this moment, when connecting pick off and digital display power supply, on digital display chip 9, will demonstrate four groups of numerals, at this moment can again therapeutic bed be finely tuned, the display digit of corresponding separately two pick offs is equated, rotary frame to 90 °, 270 ° then, observe digital displaying value, if each show value occurs when unequal to corresponding pick off, its difference is exactly the error of frame center of rotation on this direction.At this moment can again bed be finely tuned, the digital display value of each self-corresponding two pick off is equated, rotary frame to 0 ° and 180 ° again, the inconsistent phenomenon of two corresponding digital displays may appear again, can finely tune therapeutic bed again this moment, and two corresponding digital display values are equated, pass through the adjustment of repeated multiple times like this after, if always have certain difference on certain corresponding direction, this value is exactly the error amount on this direction.

This device can wait the measurement of errors of centration, and the concrete numerical value of energy display error, and very big impetus has been played in this statement and affirmation for errors of centrations such as raisings.

Claims

1. errors of centration detectors such as digital display type radiotherapy apparatus, comprise " ∏ " type base (1) that is fixed on the therapeutic bed, upper surface is the carriage (5) of lower semi-circular, cylindrical steel sleeve (8) and be fixed on adaptation board (13) on the accelerator collimator, it is characterized in that, be respectively equipped with orthogonal two horizon rules of major axis (2) on the base (1) and be three horizontal adjustment screws (3) that triangle is placed, carriage (5) be fixed on base (1) rear end above, steel bushing (8) the latter half be fixed on carriage (5) the lower semi-circular face and faying face corresponding, the major axis of steel bushing (8) is parallel with the major axis of base (1), major axis all four displacement transducers (7) on same vertical is pressed 0 ° respectively, 90 °, 180 °, 270 ° fixed-site is in steel bushing (8), the sensing head of displacement transducer (7) all equates towards the horizontal middle spindle of steel bushing (8) and to the distance of horizontal middle spindle, the end face horizontal positioned of steel bushing (8) has four to be the digital display chip (9) of one, each digital display chip (9) is connected with separately displacement transducer (7), the center of adaptation board (13) has square breach (14), be fixed with support bar (12) in the lower surface off-centre of adaptation board (13) perpendicular to adaptation board (13), be fixed with turning formula cross bar (10) in the lower end of support bar (12), cross bar (10) is provided with scale (11), the front end of cross bar (10) is pointed, it is arranged on the rotary middle point of frame, by mobile therapeutic bed, cross bar 10 is inserted in the steel bushing 8, and make the major axis of cross bar 10 consistent with the central shaft of steel bushing.

2. errors of centration detectors such as a kind of digital display type radiotherapy apparatus according to claim 1 is characterized in that, every limit is provided with two fixed screws (4) that are used for fixing therapeutic bed on the downward flanging of the both side edges of base (1).