X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1982-07-23
1984-09-18
Smith, Alfred E.
X-ray or gamma ray systems or devices
Beam control
Collimator
378152, G21F 504
Patent
active
044728280
ABSTRACT:
Filter for use in medical x-ray apparatus to permit higher intensity x-ray exposure in the heart and mediastinum area while maintaining a normal level of x-ray exposure in other areas of the body, particularly in the lung area. The filter comprises a sheet of radiation absorbing material having an opening therein, said opening corresponding to the spine and central portion of the heart. Accordingly, the upper portion of the filter exhibits a relatively narrow opening which becomes gradually wider toward the lower portion of the filter.
REFERENCES:
patent: 1709626 (1929-04-01), McGunnigle
patent: 3631249 (1971-12-01), Friede et al.
patent: 3717768 (1973-02-01), Edholm et al.
patent: 3950651 (1976-04-01), Flocee
Stanton, Basic Medical Radiation Physics, Meredith Corporation (New York: 1969) pp. 143-146.
Brochure published by Sheldon Enterprises, Inc., P.O. Box 996, Clearwater, Florida 33517.
Grigsby T. N.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Smith Alfred E.
Smith James A.
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