Process for converting the beam diameter of radioactive rays and

Details Process for converting the beam diameter of radioactive rays and Process for converting the beam diameter of radioactive rays and

1996-06-07

1998-05-26

Wong, Don

X-ray or gamma ray systems or devices

Beam control

Collimator

378148, 378150, G21K 102

Patent

active

057578869

ABSTRACT:
The present invention discloses a process for converting the beam diameter of radioactive rays and a radiating unit used in a medical stereotactic radiotherapeutic apparatus. Over a collimator base (11) symmetrical about a central axis are distributed a number set of collimators (1) of different aperture diameter. The rule of distribution of each set of collimators is the same as that of the radioactive sources (2) in the source base (4). The collimator base (11) can be rotated according to the requirement of the therapy to make a set of collimators (1) of a certain aperture diameter in alignment with the radioactive sources (2). Thus it is possible to alter the size of the beam diameter of radioactive rays. The advantages of the invention are convenience in operation, enhancement of the accuracy of positioning and the easiness of putting into practice the automatic control by a computer.

REFERENCES:
patent: 5448611 (1995-09-01), Kerjean
patent: 5528653 (1996-06-01), Song et al.

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