X-ray or gamma ray systems or devices – Specific application – Mammography
Patent
1978-11-24
1983-05-03
Smith, Alfred E.
X-ray or gamma ray systems or devices
Specific application
Mammography
128653, 2505051, 378 62, 378 96, 378 99, 378165, 378155, G03B 4116, H05G 130, G01T 100
Patent
active
043821847
ABSTRACT:
X-ray apparatus and method for producing discrete images of a human organ in fluctuating motion, e.g., the heart and related vessels. Each image is derived at a selected time related to the cardiac cycle. The images are independently presented on respective discrete areas within a common image plane. A source of X-rays irradiates the organ. A physiological synchronizer produces timing signals within the cardiac cycle for controlling the periods of transmission of the X-ray beam through the organ during, for example, end diastole and end systole. An antiscattering, masking frame has alternate parallel slits and bars at equal intervals exposing substantially half the area of presentation of an X-ray sensitive film in alternate, equally spaced area strips during, e.g., diastole. The frame is repositioned in response to a signal from the synchronizer for actuating it relative to the film such that the bars then cover the sensitized areas of the film and expose substantially the remaining half of the film during systole. The image elements are interdigitally juxtaposed to present the diastolic and systolic images in an interlaced pattern. Relative displacements of the organ during a cardiac cycle may be determined from the juxtaposed image elements.
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Cardiac Imaging Limited Partnership
Fields Carolyn E.
Smith Alfred E.
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