Detached collimator apparatus for radiation therapy

Patent · Tue Nov 14 04:00:00 EST 1989

OSTI ID:6908239

Jones, D

This patent describes a separated collimator and alignment apparatus for use with linear electron accelerators having a beam output structure supported by a gantry and an associated patient couch movable in three-dimensional space relative to the gantry. It comprises: an aperture structure defining an orifice for passage of an electron beam therethrough. The aperture structure being releasably carried by an accelerator collimator tube and the orifice being similarly configured to and not larger than an aperture defined in a patient collimator tube; the patient collimator tube defining a first medial channel for passage of a coherent electron beam and defining a planar input end facing the aperture structure and an exit end distal therefrom; an annular positioning ring defining a second medial channel to fit about the periphery of the patient collimator tube. The positioning ring defining first means for attachment to a positioning jig mechanism and second means for releasable and adjustable positional maintenance upon the patient collimator tube. The positioning jig mechanism having at least two rigid rods joined for articulating motion with the first means at a first end to fastenably interconnect with the positioning ring and the second means at a second end for support on a structure external of an electron accelerator to be serviced; and an elongate alignment rod carried by a base support disk releasably positionable in a first inner accelerator facing end of the patient collimator tube to aid axial alignment of the alignment rod with the patient collimator tube.

• Assignee: NOV; NOV-90-008290; EDB-90-080221
• Patent Number(s): US 4880985; A
• Application Number: PPN: US 7-253597A
• OSTI ID: 6908239
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
550603 -- Medicine-- External Radiation in Therapy-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
ACCELERATORS
ALIGNMENT
COLLIMATORS
DESIGN
LINEAR ACCELERATORS
MEDICINE
NUCLEAR MEDICINE
RADIOLOGY
RADIOTHERAPY
THERAPY