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US 3,947,689 AGranted
Automatic system for precise collimation of radiation
AssigneeThe Machlett Laboratories, Inc.
InventorHoward G. Wagner
Life of this patent
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Abstract
A radiographic system comprising a radiation source disposed to direct a beam of radiation through an adjustable aperture in an aligned beam-limiting device and onto an image receptor located at a selected distance from the source, and automatic means for making a unidirectional final adjustment of the aperture to provide the beam with a cross-sectional area which conforms to the size of the image receptor at the selected distance from the source.
Claims17
A radiographic system comprising:
- means for directing an X-ray beam from a source through an adjustable shutter aperture and onto an image receptor located at a predetermined distance from the source;
- and
- automatic means for adjusting the shutter aperture to provide the X-ray beam with a cross-sectional size conforming to the image receptor at the predetermined distance from the source, the automatic means including source-to-image distance sensing means for producing an output electrical signal corresponding to the source-to-image receptor distance, and shutter aperture size sensing means connected to the outpput of the source-to-image distance sensing means for modifying said signal in accordance with a defining dimension of the actual shutter aperture size and producing an associated field size electrical signal corresponding to the actual radiation field size at the plane of the image receptor.
A radiographic system comprising:
- means for directing an x-ray beam from a source through an adjustable shutter aperture means and onto an image receptor located at a selected distance from the source;
- and
- automatic means for adjusting the size of the aperture in accordance with the size of the receptor and the source-to-image receptor distance,
- said automatic means including source-to-image distance sensing means for producing an output electrical signal corresponding to the source-to-image receptor distance;
- shutter aperture size sensing means connected to the output of the source-to-image distance sensing means for modifying said signal in accordance with a defining dimension of the actual shutter aperture size and producing an associated field size electrical signal corresponding to the actual radiation field size at the plane of the receptor;
- and receptor size sensing means for producing an electrical reference signal corresponding to an equivalent defining dimension of the image receptor size.
3 more elements
Dependencies are inferred from the claim text.