X-ray or gamma ray systems or devices – Specific application – Mammography
Patent
1986-10-07
1988-07-19
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Mammography
378162, 378207, A61B 604
Patent
active
047590459
ABSTRACT:
A method and apparatus for simply, rapidly and reliably determining the diagnostically relevant quality and the general reliability of X-ray mammograms. A mammogram quality reference test standard is provided in which particulate matter of selectable form, composition and size is temporarily affixed on the breast itself for exposure to radiation during production of a diagnostic mammographic radiograph. In a preferred embodiment of the invention, the test standard utilizes particulate matter which includes smaller particles useful in evaluating resolution in the film as well as contrast, and larger particles useful primarily in evaluating contrast in the film. The test zone itself is clearly delineated by suitable, easily visible markers so as clearly to be identifiable, and the area occupied by the test standard is preferably kept small so as to ensure a minimum of interference with a viewing of the image of the tissues of the breast.
REFERENCES:
patent: 2439374 (1948-04-01), Leader et al.
patent: 3578971 (1971-05-01), Lasky
patent: 4506676 (1985-03-01), Duska
"Roentgenography of the Breast" by Kremins American Jour. of Roentgenology & Nuclear Medicine, vol. 80, #6, Dec. 1958.
Berkman Michael G.
Church Craig E.
Freeman John C.
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