CN1785456A - Method of reducing cobalt-bo machine geometric half image - Google Patents
Method of reducing cobalt-bo machine geometric half image Download PDFInfo
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- CN1785456A CN1785456A CN 200410077208 CN200410077208A CN1785456A CN 1785456 A CN1785456 A CN 1785456A CN 200410077208 CN200410077208 CN 200410077208 CN 200410077208 A CN200410077208 A CN 200410077208A CN 1785456 A CN1785456 A CN 1785456A
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Abstract
A method for decreasing the geometric half image of C0-60 radiotherapeutic machine features that the lift-type automatic multilobe raster is used to replace the original collimator and the height of the equi-central point of said automatic multilobe raster is regulated to decrease the geometric half image. Its steps includes lifting up the height of automatic multilobe raster to normal working position for the radiotherapy to the body of patient, lowering said height to make the distance between raster bottom and head surface minimal for the radiotherapy to the head of patient, and a head fixing plate is installed to the end of therapeutic bed.
Description
Technical field
The present invention relates to field of radiation therapy, be specifically related to the radiotherapy of cobalt-60 machine.
Prior art
At present remote radiotherapy mainly contains cobalt-60 machine, and gamma knife and linear accelerator, cobalt-60 machine popularize at first in China, but because of its energy is lower, penumbra are bigger with its cheapest characteristics, and the less shortcoming in treatment space progressively is accelerated device and replaces.At present disposed the hospital of cobalt-60 machine mainly with its means as conventional radiotheraphy.
The penumbra that cobalt-60 machine and linear accelerator produce is made of three kinds of penumbras: geometric penumbra, penetrate penumbra and scattering penumbra, two kinds of equipment has general character aspect penumbra and the scattering penumbra penetrating, and penetrates penumbra and reduces or eliminates with the collimator of particular design, the scattering penumbra penumbra is less, how ignores.Aspect geometric penumbra, two kinds of equipment difference are bigger, and the light source of linear accelerator is approximately point source, geometric penumbra is very little, and the radiation source of cobalt-60 machine has certain physical dimension, and the geometric penumbra of generation is very big, is to cause the bigger main cause of cobalt-60 machine penumbra.The formula of the geometric penumbra of cobalt-60 machine is P=S* (SAD-SDD)/SDD, as Fig. 1, wherein S represents the diameter of cobalt source cylinder, and SAD is the distance that central plane is extremely waited in the cobalt source, and SDD is the distance of cobalt source to terminal collimator bottom surface, under the certain situation of S, the approach that reduces penumbra has two, and the one, increase SAD, but square relation that is inversely proportional to of the decay of cobalt source energy and distance, increase the activity that SAD will increase considerably the cobalt source, cost need increase substantially; The 2nd, increase SDD, the effect of increase SDD is apparent in view, and (molecule reduces, denominator strengthens), but certain limit is arranged, because guarantee enough treatment spaces, cobalt-60 machine is generally done terminal collimator (or claiming compound collimator) very big, and the SAD of cobalt-60 machine that generally uses at present is 800mm, and SDD is 500mm.Suppose that S is 20mm, then geometric penumbra position 12mm.The head tumor treatment is not needed too big treatment space, and SDD can increase to 600mm, and at this moment geometric penumbra is 6.6mm, and the geometric penumbra when being 500mm with SDD is compared, reduced Cobalt-60 machine that just selling in the market and that just using in hospital, the height of its collimator is changeless, can't adjust according to the practical situation in when treatment, geometric penumbra is bigger all the time, is difficult to realize accurate treatment.
Summary of the invention
The present invention will solve is existing cobalt-60 machine, and the height of its collimator is changeless, and the practical situation in the time of can't be according to treatment is adjusted, and geometric penumbra is bigger all the time, is difficult to realize the problem of accurate treatment.
In order to solve above technical problem, the technical scheme that the present invention takes is:
A kind of method that reduces cobalt-60 machine geometric penumbra, it is characterized in that, (as Fig. 3, Fig. 4), the method for the height by regulating the relative isocenter point of automatic multi-leaf optical grating reduces the geometric penumbra of cobalt-60 machine to replace the compound collimator of cobalt-60 machine with liftable automatic multi-leaf optical grating.
Specifically may further comprise the steps:
When (one) doing the body radiotherapy,,, rise to normal operating conditions, the patient is carried out irradiation treatment by normal mode by motor-driven or manual mode by automatic multi-leaf optical grating height and position mapping device;
When (two) doing the head radiotherapy, by automatic multi-leaf optical grating height and position mapping device, by motor-driven or manual mode, the grating bottom surface drops to apart from the nearest place of patient's head body surface;
(3) head fixing head of termination in face of the therapeutic bed;
Described automatic multi-leaf optical grating is the automatic multi-leaf optical grating of double focusing type fly.
The length and width design of described head fixing head does not contact in the time of should guaranteeing the head rotation.
Cobalt after the improvement-60 machine can carry out accurate treatment.
After having adopted technique scheme, because the geometric penumbra of cobalt-60 machine reduces, cause the comprehensive penumbra of cobalt-60 machine to reduce, can carry out accurate treatment by the speed and the position of control multi-leaf optical grating blade.
Description of drawings
Figure one is the head section structural representation of existing cobalt-60 machine.
Figure two is calculating sketch maps of cobalt-60 machine geometric penumbra.
Figure three is the structural representations when utilizing the present invention to carry out the body treatment.
Figure four is the structural representations when utilizing the present invention to carry out head treatment.
Figure five is perspective view of the present invention.
Figure six is stereochemical structure exploded perspective views of the present invention.
The specific embodiment
As Fig. 3, Fig. 4, Fig. 5, shown in Figure 6, a kind of method that reduces cobalt-60 machine geometric penumbra may further comprise the steps:
(1) as shown in Figure 3, during the body radiotherapy,,, rise to normal operating conditions, the patient is carried out irradiation treatment by normal mode by motor-driven or manual mode by automatic multi-leaf optical grating height and position mapping device;
(2) as shown in Figure 4, during the head radiotherapy, by automatic multi-leaf optical grating height and position mapping device, by motor-driven or manual mode, the grating bottom surface drops to apart from the nearest place of patient's head body surface;
(3) as shown in Figure 6, head fixing head of termination in face of the therapeutic bed;
As shown in Figure 6, multi-leaf optical grating is the automatic multi-leaf optical grating of double focusing type fly automatically.
Accurate treatment is carried out in speed and position by control multi-leaf optical grating blade.
The implication that respectively identifies among the figure is: 1 is that cobalt source, 2 is that compound collimater, 3 is that body surface, 4 is that double focusing is many Leaf grating, 5 is that head fixed head, 6 is that therapeutic bed, 7 is cobalt-60 machine.
Claims (5)
1, a kind of method that reduces cobalt-60 machine geometric penumbra is characterized in that, replaces the compound collimator of cobalt-60 machine with liftable automatic multi-leaf optical grating, and the method for the height by regulating the relative isocenter point of automatic multi-leaf optical grating reduces the geometric penumbra of cobalt-60 machine.
2, as the method for claim 1 described minimizing cobalt-60 machine geometric penumbra, it is characterized in that, may further comprise the steps:
When (one) doing the body radiotherapy,,, rise to normal operating conditions, the patient is carried out irradiation treatment by normal mode by motor-driven or manual mode by automatic multi-leaf optical grating height and position mapping device;
When (two) doing the head radiotherapy, by automatic multi-leaf optical grating height and position mapping device, by motor-driven or manual mode, the grating bottom surface drops to apart from the suitable place of patient's head body surface close together;
(3) head fixing head of termination in face of the therapeutic bed.
As the method for claim 1 described minimizing cobalt-60 machine geometric penumbra, it is characterized in that 3, described automatic multi-leaf optical grating is the automatic multi-leaf optical grating of double focusing type fly.
4, as the method for claim 2 described minimizing cobalt-60 machine geometric penumbras, it is characterized in that, do not interfere mutually when the length and width design of described head fixing head should guarantee the head rotation.
As the method for claim 1,2,3,4 described minimizing cobalt-60 machine geometric penumbras, it is characterized in that 5, the cobalt after the improvement-60 machine can carry out accurate treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410077208 CN1785456A (en) | 2004-12-09 | 2004-12-09 | Method of reducing cobalt-bo machine geometric half image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410077208 CN1785456A (en) | 2004-12-09 | 2004-12-09 | Method of reducing cobalt-bo machine geometric half image |
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| CN1785456A true CN1785456A (en) | 2006-06-14 |
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| CN 200410077208 Pending CN1785456A (en) | 2004-12-09 | 2004-12-09 | Method of reducing cobalt-bo machine geometric half image |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105031832A (en) * | 2015-08-27 | 2015-11-11 | 西安大医数码技术有限公司 | Intensity modulated radiation therapy apparatus |
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2004
- 2004-12-09 CN CN 200410077208 patent/CN1785456A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105031832A (en) * | 2015-08-27 | 2015-11-11 | 西安大医数码技术有限公司 | Intensity modulated radiation therapy apparatus |
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