X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1986-09-23
1988-08-09
Howell, Janice A.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378112, 378113, 378 95, H05G 134
Patent
active
047633433
ABSTRACT:
A structure and method for providing optimum recording of X-ray images without need for experimenting to learn optimum X-ray tube voltage, current, anode focal spot size and exposure time. The method and structure of this invention sample the radiation passed through an object to be radiographed during a short portion of the total exposure time and adjust voltage, current and focal spot size so that the radiation delivered by the X-ray tube during the remainder of the exposure time will produce optimum contrast between structures within the object being radiographed, also optimum sharpness of the image and optimum darkening of a film, xerographic picture, fluoroscopic image, or other recording medium. The method and structure of this invention account for variations in absorption coefficient between one object to be radiographed and the next. This invention is particularly useful for medical applications, and in the medical field, particularly important in mammography.
REFERENCES:
patent: 3894235 (1975-07-01), Franke
patent: 4075484 (1978-02-01), Meyer-Ebrecht et al.
patent: 4090084 (1978-05-01), Epstein et al.
patent: 4160906 (1979-07-01), Daniels et al.
patent: 4400823 (1983-08-01), Haendle
patent: 4638500 (1987-01-01), Smits et al.
Howell Janice A.
MacDonald Thomas S.
MacPherson Alan H.
Porta David P.
Young Edel M.
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