Mitsubishi Denki Kabushiki Kaisha

Masaaki Kurokawa

Masataka Nagao

A system for calculating the dose at a point of concern in a body has a data section for storing data concerning the irradiated radiation and a contribution distribution calculating section for calculating contribution factors. The contributing factors indicate the degree to which the respective neighboring points in the irradiated body contribute to the dose at the point of concern. The system also has a density distribution data section for storing data concerning the electron density at the respective neighboring points in the irradiated body which receives the therapy treatment and a region classification section for classifying the respective neighboring points in the typical models or the irradiated body. A dose calculating section calculates the dose at the point of concern on the basis of the contribution factors, the data in the density distribution data section, and the data in the region classification section.

Radiation therapy treatment planning system

A radiotherapy device includes: a linac 1 for generating an electron beam 9, and a thin guide tube 2 for guiding the electron beam from the linac 1 to the affected part 7 within the body of the patient 6. The orbit of the electron beam 9 is controlled by means of the feedback circuit 8 in response to the output of the deviation detector 6 which detects the leakage of the electron beam outside of the guide tube 2. A high-level dosage can be accomplished without incurring danger of radiation exposure on the operator.

Radiotherapy device

The radiotherapy treatment planning system is for calculating the radiation dose to be absorbed by an object to be irradiated, prior to radiotherapy. The distribution of contribution output unit outputs the distribution of contribution showing the contribution rates of scattered beam or electron beam to an observational point in each point of the object to be irradiated. The arithmetic unit calculates the absorbed dose of the observational point due to the scattered beam or the absorbed dose due to the electron beam, by summing up each contribution rate multiplied with the electron density at the point corresponding thereto.

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Amagasaki, Japan

Masaaki Kurokawa