X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1994-11-25
1998-02-03
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 37, 250368, 25037011, G01T 120
Patent
active
057152926
ABSTRACT:
A CCD-scintillator x-ray image sensor (18) has a high sensitivity at room temperature and a low profile, enabling the use of the x-ray image sensor in most modern mammography x-ray machines. A cassette 10 that encloses the CCD-based x-ray image sensor has the approximate dimensions of 10.5.times.7.7.times.0.6 inches, and is thus form and fit compatible with conventional film-based cassettes. An electronic interface to the cassette requires but a single cable (24) and a standard connector (22) for connection to a CCD sensor electronics unit. The CCD sensor electronics unit interfaces to a computer, such as a conventional personal computer or workstation, having a relatively high resolution display and a provision for digitally recording high-resolution electronic images. The high sensitivity at ambient (room) temperature results from an x-ray scintillator screen (18c) that is coupled to the CCD image sensor (18a) via a bias cut fiber optic faceplate (18b). The CCD image sensor has very low dark current density, high responsivity to the green fluorescence of the screen, and multiple output ports for minimizing the time required for readout and for minimizing the noise bandwidth at the output.
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Karellas Andrew
Sayag Michel
Loral Fairchild Corporation
Porta David P.
University of Massachusetts Medical Center
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