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Isah: A versatile treatment positioner for external radiation therapy
Author(s) -
Lyman John T.,
Chong Claude Y.
Publication year - 1974
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/1097-0142(197407)34:1<12::aid-cncr2820340104>3.0.co;2-u
Subject(s) - cyclotron , irradiation , perpendicular , radiation therapy , radiation , medical physics , nuclear medicine , beam (structure) , biomedical engineering , medicine , ion , optics , physics , surgery , nuclear physics , mathematics , geometry , quantum mechanics
Mechanical features, control philosophy, and operational characteristics are described for the computer‐controlled patient positioner, „ISAH'' (Irradiation Stereotaxic Apparatus for Humans). The positioner is currently being used with the 910‐MeV helium‐ion beam from the 184” Cyclotron at the Lawrence Berkeley Laboratory. It is capable of positioning a patient to 0.1‐mm accuracy in three dimensions. It can simultaneously or selectively translate the patient in three orthogonal axes and rotate him about two perpendicular axes. ISAH is used to deliver a therapeutic dose of radiation to an arbitrarily determined volume within the patient's body during irradiation, so as to minimize exposure to surrounding tissues. The motions are under online control by a PDP‐8/1 computer which directs the necessary motions and verifies the positioning. The computer also controls the intensity and the depth of penetration of the heavy‐ion beam.