B dot Medical to develop ultra-compact proton cancer therapy

B dot Medical initiates development of an ultra-compact proton cancer therapy system to replace x-ray cancer therapy system

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TOKYO—B dot Medical Inc. has announced that the company is initiating the development of an ultra-compact proton cancer therapy system. B dot Medical hopes that the new technology may be able to replace the commonly used x-ray cancer therapy system (LINAC).
Proton cancer therapy is a high-precision radiation therapy. The proton is accelerated to up to 60% of light speed, delivered to the treatment room and used to irradiate affected areas, in order to kill cancer cells. Proton therapy is expected to be highly effective, with the ability to concentrate the beam on the target, limiting the irradiation of surrounding normal tissues.
More than 180,000 patients have been treated in proton therapy over the years. The use of proton cancer therapy became applicable for health insurance in Japan for pediatric cancer in 2016, followed by prostate cancer, head and neck cancer, and bone and soft tissue tumors in 2018. The number of patients that receive proton cancer therapy is expected to continue increasing. However, proton cancer therapy systems are very large; this kind of large-scale project needs a dedicated building for installation, and that makes its implementation very expensive.
Conventionally, a rotating gantry is used in order to irradiate from the desired angle. However, its rotating mechanism is large and complex, contributing to its large size and the need for dedicated buildings. B dot Medical has devised a non-rotating gantry, which can bend the proton beam without requiring a rotating mechanism. This non-rotating gantry — which uses a superconducting magnet as a bending magnet, the form of which was also optimized — allows the system to be significantly downsized.
The new ultra-compact proton cancer therapy system is not only easy to install in hospitals new to proton cancer therapy, but will be installable in the space of the commonly used x-ray cancer therapy system. B dot Medical aims to develop a proton cancer therapy system that is easy to introduce to many hospitals.
The ultra-compact proton cancer therapy system is still under development, and not yet available for sale or distribution in Japan. Planned commercial availability in the U.S. is to follow the Japanese market. B dot Medical says that the company plans to contribute in the fight against cancer through the development of proton cancer therapy and other pioneering cancer therapy systems.

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