Medical proton heavy ion accelerator

Abstract

A medical proton heavy ion accelerator comprises ion sources, a low energy injector, a cyclotron and a traveling wave linear accelerator connected in sequence; the ion sources comprise a hydrogen ionsource and a carbon ion source, and can provide hydrogen ions and carbon ions, thus enabling the medical proton heavy ion accelerator to has two radiotherapy modes that include a proton ray mode and aheavy ion ray mode; said two radiotherapy modes are mutually implemented, and can be selected according to real treatment demands; the cyclotron can directly accelerate a hydrogen ion beam or a carbon ion beam from a low energy level to a high energy level, thus providing higher acceleration efficiency and effect; the energy of the proton beam or carbon ion beam emitted by the traveling wave linear accelerator can be adjusted, thus obtaining the proton beam or carbon ion beam of different energy values, satisfying different dosage demands for curing cancers, providing a strong adaptability, and improving the cancer treatment effect.

Description

technical field [0001] The present application relates to the field of cancer treatment instruments, in particular to a medical proton heavy ion accelerator. Background technique [0002] At present, cancer has become the number one killer affecting human life and health. In recent years, food safety, water and soil pollution, living habits, work pressure and other factors have gradually increased the proportion of people suffering from cancer, seriously affecting the health of the people. At present, there are three conventional treatment methods: surgery, radiotherapy and chemotherapy, and the three methods are complementary and compatible with each other. According to statistics, 70% of tumor patients need radiotherapy regardless of operation or not. Radiotherapy has become one of the effective means of treating cancer. The types of particles currently used in radiotherapy include electrons, protons, heavy ions, X-rays or γ-rays. The energy attenuation characteristics o...

AI Technical Summary

Problems solved by technology

Cyclotrons can provide stable and continuous proton beams, and the beam cut-off and opening speeds are very fast, and are usually used to accelerate particles from low-energy energy levels to medium-energy energy levels, such as the patent with the publication number CN200580049174; the cyclotron designed by IBA company The accelerator uses a superconducting cyclotron to directly accelerate particles from a low-energy energy level to a high-energy energy level (carbon ions are accelerated to 400MeV / u, and protons are accelerated to 265MeV / u), but the disadvantage of this cyclotron is that the emitted particle beam energy is fixed. The energy of the beam cannot be adjusted. In order to realize the continuous adjustment of the energy of the particle beam, it is necessary to use an energy reducer to reduce the energy of the outgoing particle beam. This interception method of particle beam energy adjustment will generate a large amount of radiation, which will easily cause the activation of the device. Increase the radiation shielding cost of the hospital, and the beam energy utilization rate caused by scattering is low, and the beam quality after scattering is poor

Synchrotrons can provide particle beams with continuously adjustable energy, but synchrotrons are composed of injectors and ring accelerators, occupy a large area, and the entire system architecture is complex, and the cycle of injection, energy up and standardization of synchrotrons takes a long time , the effective time corresponding to the extraction platform is very short, and the energy conversion time is slow, resulting in a long time for ineffective treatment. Only pulsed particle beams can be provided, and the average dose rate is low, which cannot meet the needs of rapid and continuous treatment.

The linear accelerator is easy to extract and inject particles, and can provide a stable and continuous proton beam. The proton beam has almost no loss during acceleration and transmission. It has the advantages of long-term stable operation of the ion source and high dose rate. However, due to the existing linear accelerator A coupled cavity linear accelerator (CCL) is used, which is a standing wave accelerator, and the energy of the emitted proton beam is a fixed value, which cannot realize continuous adjustment of the emitted particle energy

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