Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-12-13
1992-09-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
35821315, H01J 4014
Patent
active
051515881
ABSTRACT:
A radiation imaging apparatus provided with a detector array comprising a plurality of detector units, each of which, in turn, comprises a plurality of X-ray detecting elements each having a photosensitive surface of a different area from those of the other elements and corresponds to one picture element or pixel of a display, the output signal from one or more of the X-ray detecting elements of each of the detector units being used as image information for a corresponding one of the pixels of the display. While the X-ray dose remains at a low level, the detection output from the detecting element having a large photosensitive surface or the sum of the output from that element and the outputs from the other elements having smaller photosensitive surfaces is used as pixel information to form an image of the object being examined. When the radiation dose increases to a predetermined high level, the result of detection by only the element having a small photosensitive surface is used as pixel information.
REFERENCES:
patent: 4383327 (1983-05-01), Kruger
patent: 4641359 (1987-02-01), Okibayashi et al.
patent: 4889984 (1989-12-01), Sedgbeer
Adachi Susumu
Kiri Motosada
Nelms David C.
Shami K.
Shimadzu Corporation
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