Patent ID: 8588368

Claim:
A machine for intraoperative radiation therapy or IORT (Intra Operative Radio Therapy), the machine comprising: a body, a radiating head connected to the body and configured to emit an electron beam, and a shield for X rays, wherein said shield includes a mobile stand supporting an absorbing mass coupled, through a connecting device, to a detecting device configured to detect the position of the absorbing mass, and to give to a processor at least a signal indicating the position of the absorbing mass with respect to the body of the machine, said processor determining, on the basis of at least one of the position and the orientation of the radiating head, the position of the absorbing mass with respect to the electron beam axis, the machine further comprising a system for measuring the total dose of the electron beam emitted during an IORT treatment for a period of duration R, and an amperometric transformer configured to measure an instantaneous current I beam of the emitted electron beam, an instantaneous dose D being calculated as a function of said instantaneous current I beam , the total dose being calculated through a time integration of the instantaneous dose for the treatment period, wherein said instantaneous dose D is calculated on the basis of a linear dependency from said instantaneous current I beam , D=D 0 +A*ΔI beam wherein ΔI beam =I beam −I beam — Ref , I beam — Ref is a reference value of the instantaneous current of the emitted electron beam, and D 0 and A are coefficients experimentally determined in a phase of clinical dosimetry of the machine.