China will independently develop a superconducting cyclotron for the first time. The China Institute of Atomic Energy will launch a prototype of a 230 MeV medical proton cyclotron this year. It is planned to be installed around 2018 and will be “landed†as a demonstration device, and then gradually enter the clinical testing program.
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Superconducting accelerator
Medical proton cyclotrons may be unfamiliar to ordinary people. "Proton knife" is a more vivid name, it is the gospel of many cancer patients.
According to Hong Zhihong, deputy director of Chang Gung Memorial Hospital in Linkou, Taiwan, traditional radiotherapy (photon radiotherapy) uses high-energy X-rays (photon rays) produced by linear accelerators to treat cancer. Although it has certain effects, it is a kind of "killing one." The setting of thousand and self-damage is 100. When the normal cells are injured to a certain amount, the tissue function is impaired, and it is easy to accidentally injure the normal tissue near the tumor. It is easy to produce secondary tumors or other lesions after a long period of time.
Compared with photon radiation therapy, proton therapy breaks through the traditional radiation therapy X-ray "sandshot", which is a means of treating tumors with protons or heavy ion rays. It is the most internationally recognized and current. Radiation therapy technology.
When the proton is accelerated to about 70% of the speed of light by the synchrotron, the ion beam is directed into the human body. Before the radiation reaches the tumor lesion, the energy is released little, and when the lesion reaches the moment, a large amount of energy is released. This energy release, known as the "Prague Peak," achieves "stereotactic blasting" of the tumor.
Proton therapy provides new treatment options for cancer patients who cannot undergo surgery. Due to the high efficacy of proton radiotherapy and low side effects, it can avoid the injury of healthy cells during treatment. It is especially suitable for children with cancer, lung cancer, liver cancer and prostate. Cancer, pancreatic cancer, and nasopharyngeal cancer are particularly therapeutic in children's cancer, which can greatly reduce the impact on height, vision, and reproductive system during child growth. Of course, it is not omnipotent: diffuse tumors, or tumors close to the gastrointestinal tract are not suitable for proton therapy.
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The picture shows proton therapy
Human adenovirus has 51 serotypes, 6 subgroups A-F, and the genome is a linear double-stranded DNA molecule. Groups B, C, and E are associated with respiratory infections; groups A and F are associated with gastrointestinal infections, groups D and E are associated with eye infection; and groups D and E are associated with kidney and urinary tract infections. Adenovirus is acid-resistant, so it can continue to remain active through the gastrointestinal tract.
PCR- fluorescence probe method
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