Automatic exposure and brightness control for fluoroscopic and r

Details Automatic exposure and brightness control for fluoroscopic and r Automatic exposure and brightness control for fluoroscopic and r

1998-03-25

2000-04-04

Bruce, David V.

X-ray or gamma ray systems or devices

Specific application

Absorption

378 988, G01N 2304

Patent

active

060470429

ABSTRACT:
An exposure control system for radiographic, fluoroscopic, or other diagnostic imaging includes an exposure sensor array and a control element. The exposure sensor array has a plurality of sensor elements directed to defined locations uniformly distributed over the imaging field and may make direct or indirect measurements of exposure rate or imaging converter brightness. A structure or region of diagnostic interest to examining personnel is identified, and only sensors which correspond to locations within the area of interest are selected for use in exposure control. Predefined examination parameters suitable for particular anatomical patient regions are stored. Upon request by examining personnel to perform an examination of an anatomical patient region, the parameters are retrieved for use. The parameters include a preselection of sensors typically suitable for examinations of such region. The sensor locations, and their selection status, may be displayed as an overlay on an actual diagnostic image so that examining personnel may determine which sensors correspond to a structure or region of diagnostic interest. Examining personnel may manually select or deselect sensors. During an automatic mode examination, sensor outputs are analyzed and sensors providing apparently spurious outputs are deselected.

REFERENCES:
patent: 4247777 (1981-01-01), Pfeifer et al.
patent: 4454606 (1984-06-01), Relihan
patent: 5333168 (1994-07-01), Fernandes et al.
patent: 5617462 (1997-04-01), Spratt
patent: 5692507 (1997-12-01), Seppi et al.

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