Shape-adaptive X-ray strengthening method and collimator
A conformal intensity modulation and collimation technology, which is applied in the direction of X-ray/γ-ray/particle irradiation therapy, etc., can solve the problems that the multi-leaf aperture cannot piece together the graphics, the dose of the field surface is uneven, and the implementation is troublesome.
Inactive Publication Date: 2007-05-16
王增开
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[0002] At present, radiotherapy is one of the main means of tumor treatment, and has a wide range of applications. Conformal intensity-modulated radiotherapy is the most scientific and practical method in radiotherapy today. The best method for conformal intensity-modulated radiotherapy is electronic scanning. However, the most mature electromagnetic deflection scanning technology is difficult to apply here. First, although high-energy electron beams have a certain penetrating power to human tissues, the effect of directly penetrating into deep tissues of the human body is not good. Secondly, electron beams propagate through a certain distance. Afterwards, the pencil-shaped beam projected on the field surface will be a Gaussian-curve-distributed spot with low marginal dose and high intermediate dose, which leads to uneven dose and unclear boundary of the field surface, so it is not suitable for conformal radiotherapy. It is best to use X-rays for radiotherapy, but since X-rays are composed of uncharged particles, it is difficult to control their deflection by electromagnetic deflection. Currently, multi-leaf diaphragms are generally used to achieve conformal radiotherapy to X-rays, but There are still many problems in the multi-leaf light barrier method: first, the push and pull of dozens of pairs of lead strips are controlled by motors, so the speed of changing from one shape to another will not be very fast; secondly, the multi-leaf light barrier column can not piece together all the graphics, such as a five-pointed star, unless it is completed in two or more times; third, it can be used for intensity modulation therapy, but it is more troublesome to implement; fourth, because the multi-leaf collimator is composed of Thinner tungsten strips (5 mm or thinner) are likely to cause sticking during movement; fifth, the edge of the field of view given by this dora sheet collimator is stepped, which is different from the actual tumor. The shape is only an approximate fit; in addition, it has a larger penumbra
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[0014] In this embodiment, the main collimator 1 is made of a square lead plate with a thickness of 12 cm and a side length of 45 cm. On the lead plate, there are 400 square main collimating through holes 3 with a cross-section of 10 mm×10 mm evenly distributed in a matrix. , the center distance between the holes is 20mm, and a small tungsten target element 5 is fixed at its entrance, with the same area as the entrance. It is made of lead plate, and there are 400 square sub-collimation through-holes 4 with a cross-section of 5mm×5mm distributed in a matrix. When the electron beam emitted from the linear accelerator scans the small tungsten target element 5 on the main collimator 1, X-rays will be generated on the small tungsten target element 5 and penetrate from the bottom of the main collimator through hole 3 and the square hole area The same small square field of X-rays (ie 10mm×10mm), these small square fields of X-rays reach the secondary collimator 2 and are further coll...
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The shape-adaptive X-ray strength regulator for medical radiotherapy includes electron beam emitter, X-ray generating tungsten target and collimation mechanism, and features that the tungsten target consists of tungsten target elements arranged in certain rule and the X-ray strength is shape-adaptive regulated by means of the control of the electron beam strength and the scanning trace and the collimation with the collimation mechanism. The present invention also discloses one kind of the collimation mechanism as the implementation.
Description
technical field [0001] The invention relates to a method for realizing X-ray conformal intensity modulation and a collimation device thereof, in particular to a method for X-ray conformal intensity modulation for medical radiotherapy, and also relates to a collimation mechanism for realizing the method. Background technique [0002] At present, radiotherapy is one of the main means of tumor treatment, and has a wide range of applications. Conformal intensity-modulated radiotherapy is the most scientific and practical method in radiotherapy today. The best method for conformal intensity-modulated radiotherapy is electronic scanning. However, the most mature electromagnetic deflection scanning technology is difficult to apply here. First, although high-energy electron beams have a certain penetrating power to human tissues, the effect of directly penetrating into deep tissues of the human body is not good. Secondly, electron beams propagate through a certain distance. Afterwar...
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Inventor 王增开
Owner 王增开