FLAT PANEL DETECTOR FOR RADIATION IMAGING AND PIXEL FOR USE THEREIN

摘要

A flat panel detector (20) for radiation imaging includes an array of pixels (22) arranged in rows and columns. Gate lines (24) interconnect the pixels of each row while source lines (26) interconnect the pixels of each column. A radiation transducer (CSE) is disposed over the array. Each pixel includes a TFT switch (38) having its gate electrode connected to a gate line (24) and its source electrode (42) connected to another gate line. The drain electrode (40) of TFT switch (38) constitutes the pixel electrode of pixel (22). The drain electrode and a bottom electrode (52) connected to source line (26) constitute a storage capacitor (CST). When TFT switch is biased and the drain electrode is charged, the drain electrode discharges through TFT switch on to the source terminal and to the gate line. This results in a release of the charge held by the bottom electrode which is sensed by a charge amplifier connected to the source line.