Radiant energy – Radiation controlling means
Patent
1978-06-15
1979-10-30
Dixon, Harold A.
Radiant energy
Radiation controlling means
250512, G02B 500
Patent
active
041729790
ABSTRACT:
A device implemented method for conformation radiotherapy of tumors or the like involves sequentially interposing a plurality of separate, individual radiation beam shaping shields between a tumor and a source of radiation as the latter is rotated about the tumor in order to deliver a plurality of separate doses of radiation to various profiles of the tumor which provides uniform, homogenious radiation dosage to the tumor. The method permits use of full thickness, central radiation absorbers for completely protecting healthy organs or living tissue lying in the path of the radiation beam. A treatment reel releasably carrying a plurality of the radiation shields each having a central absorber integral therewith, in aligned relationship on the circumference thereof is removably mounted for rotation on a treatment head carrying the radiation source which is revolvable in a course around the patient. Mechanism is provided for producing incremental rotation of the reel on the head as the latter shifts between treatment locations in its revolving course, whereby the radiation shields are sequentially moved into a shielding position when the head is disposed at respectively corresponding treatment locations.
REFERENCES:
"An Examination of Synchronous Shielding in Co-60 Rotational Therapy" by Rawlinson et al., Radiology, vol. 102, pp. 667-671, Mar. 1972.
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