Production of three-dimensional physical compensator using section cutting method to realize physical compensation radiotherapy

Abstract

The invention relates to a process for making three-dimensional physical compensation apparatus belonging to the field of radiation therapy, and suitable for the intensity modulation technique of X-ray (linear accelerator), gamma-ray and electronic rays. By applying a cross sectioning technique, the invention realizes the transformation from complex three-dimensional dosage model into a plurality of 2-D plane models that can be made, then the multiple two-dimensional models are superposed. The system can be applied to various linear accelerators with easiness in operation.

Description

technical field [0001] The invention relates to a manufacturing method of a three-dimensional intensity modulator (also known as a three-dimensional lead melting block, a three-dimensional physical compensator), which is suitable for intensity-modulated radiation of X-rays (linear accelerators), gamma rays and electron rays in the field of radiotherapy Intensity modulation techniques of radiation in therapy. Background technique [0002] IMRT-Intensity Modulation Radiotherapy (IMRT-Intensity Modulation Radiotherapy) is an advanced external three-dimensional radiation technology newly developed on the basis of conformal radiation therapy (3D CRT-three Dimension Conformal Radiotherapy). The shape is consistent with the shape of the tumor in the three-dimensional direction, and the output dose rate of each point within the irradiation field can be adjusted according to the requirements, and the weight of each beam in the irradiation field can be optimized, so that the tumor dos...

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Problems solved by technology

The disadvantage is that the treatment time is long, and the negative influence of organ movement must be overcome; at the same time, due to the error of the stepping movement of the bed, the adjacent areas of the thin layer may be over- or under-dose irradiated

Moreover, the collimator has high processing precision and is expensive (about 300,000 US dollars), and the leakage between the blades cannot be ignored, and the radiation field radius of the blades is large

The latter adopts narrow-beam scanning (Scanning Beam) technology, uses computer to control the size of electromagnetic scanning current, generates electrons or X-rays with different directions and sizes, and forms the required dose intensity distribution. It has high radiation utilization rate and short treatment time. advantages, but it is expensive (about 8 million US dollars), so far only about ten radiotherapy centers in the world have used it

[0004] For the application of Scanditronix MM50 cyclotron to realize IMRT, it is obviously not in line with the economic strength of hospitals at all levels in my country. However, the application of Peacock system of NOMOS Company, its automatic control of linear accelerator and high precision requirements of treatment bed make the existing domestic Both linear accelerators and old-type imported accelerators cannot be achieved, and their prices are also difficult for small and medium-sized hospitals to accept

On the one hand, there is an urgent need and an inevitable trend in clinical practice; on the other hand, due to the price that is difficult to change and the bottleneck limitation of hardware conditions, it is still difficult for IMRT technology to widely enter clinical radiation therapy in my country, and tens of thousands of tumor patients cannot receive the best treatment. good treatment

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