Image detection device having correction circuit for removing artifacts due to delayed charge transfer
First Claim
1. An image detection device comprising an image detection array which incorporates radiation sensitive elements to convert incident radiation into charges, and read out lines to transfer said charges to a read out circuit which is arranged to convert transferred charges into a primary electronic image signal, wherein the image detection device comprises a correction circuit to form an image correction signal for converting said primary electronic image signal into a corrected image signal by removing artifacts due to delayed charge transfer from the primary electronic image signal.
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Accused Products
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.
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Citations
5 Claims
- 1. An image detection device comprising an image detection array which incorporates radiation sensitive elements to convert incident radiation into charges, and read out lines to transfer said charges to a read out circuit which is arranged to convert transferred charges into a primary electronic image signal, wherein the image detection device comprises a correction circuit to form an image correction signal for converting said primary electronic image signal into a corrected image signal by removing artifacts due to delayed charge transfer from the primary electronic image signal.
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5. An x-ray examination apparatus comprising an image detection device responsive to x-ray radiation, said detection device comprising an image detection array which incorporates radiation sensitive elements to convert incident radiation into charges, and read out lines to transfer said charges to a read out circuit which is arranged to convert transferred charges into a primary electronic image signal, characterised in that the image detection device comprises a correction circuit to form an image correction signal for converting said primary electronic image signal into a corrected image signal by removing artifacts due to delayed charge transfer from the primary electronic image signal.
Specification