Image detection device having correction circuit for removing ar

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit

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348250, 378 988, H04N 314, H04N 532

Patent

active

055302386

ABSTRACT:
An image detection device, notably a semiconductor image detection array for detecting x-ray images, is provided wherein perturbations due to phantom-images are substantially mitigated. In such an image detection array incident image carrying radiation is converted into charges. Delayed charge transfer due to trapping of charges in the semiconductor material of radiation sensor elements causes such perturbations. In an image detection device according to the invention a correction circuit is provided which is arranged to form an image correction signal being representative of delayed transferred charges. In a particular embodiment of an image detection device according to the invention the image correction signal is formed as a superposition of exponentially decaying signals of images which were detected before the detection of a currently detected image. An image signal containing artifacts due to delayed charge transfer is formed by a read-out circuit whereto charges formed by the radiation sensor elements are transferred. A corrected image signal is subsequently formed from the image correction signal and the signal formed by the multiplex circuit.

REFERENCES:
patent: 4742396 (1988-05-01), Bell
patent: 5018179 (1991-05-01), Kaneko
patent: 5083024 (1992-01-01), Takeda et al.
patent: 5184018 (1993-02-01), Conrads et al.
patent: 5331682 (1994-07-01), Hsieh

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