B dot Medical: successful proof of concept for an ultra-compact proton therapy system


TOKYO–(BUSINESS WIRE)–B dot Medical Inc. and Osaka University Nuclear Physics Research Center (RCNP) have completed a proof-of-concept (POC) of the ultra-compact proton therapy system under development and confirmed that the proton beam generated by an accelerator was bent inside the system’s superconducting bending magnet and irradiated to the isocenter (*1). This proves the feasibility of the development concept of reducing the size of the device and is a major step forward in improving access to cancer treatment with fewer side effects.

This POC was conducted under the International Joint Usage/Research Center program promoted by the Research Center for Nuclear Physics (RCNP) of Osaka University and is also the first experimental research using the improved AVF cyclotron beam at the ‘RCNP Accelerator Facility. In the POC, the proton beam generated by the accelerator was passed through an in-house developed superconducting bending magnet (*2), and it was confirmed that the proton beam was irradiated at the isocenter by being bent at an arbitrary angle in the magnet curvature.


The isocenter is the intersection of each axis of mechanical rotation.

In radiotherapy, it refers to the area where the radiation is most concentrated.

(by “Physical and Technological Quality Assurance Guidelines for Particle Beam Therapy”)


Press release, June 25, 2021

“B dot Medical Successfully Develops Compact Proton Beam Bending Magnet Using Superconducting Technology »


About Bdot Medical

B dot Medical Inc. is a start-up company spun off from the National Institute of Radiological Sciences (NIRS) and is developing an ultra-compact proton therapy system using advanced technology and experience cultivated at NIRS. We challenge the world with the power of Japanese technological innovation.

By using a technology that bends the proton beam at an arbitrary angle, which is completely different from the structure of the conventional system, the system can be made as compact and affordable as radiation therapy systems. Our goal is to improve access to proton therapy by making it possible to install proton therapy in hospitals where it has been difficult due to space and cost constraints.

About RCNP

The Center is a Joint International Utilization/Research Center with accelerator facilities consisting of an AVF cyclotron and a ring cyclotron. It is the largest accelerator facility in Japan among university-affiliated accelerator facilities, and it promotes cutting-edge research in nuclear physics and its applications while taking advantage of its unique characteristics. In addition to providing a unique location for research and teaching within Osaka University, the center promotes experimental and theoretical research in fundamental physics through collaboration with researchers not only in Japan but also in worldwide as an international utilization/research center for subatomic science.

Company information


Bdot Medical Inc.


5-10-10 Harue-cho, Edogawa-ku, Tokyo 134-0003 JAPAN


Takuji Furukawa, President and CEO


March 1, 2017

Commercial activities:

1) Counseling support for particulate therapy

2) Develop proton therapy systems




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