Analysis of lead oxide (PbO) layers for direct conversion X-ray detection

Abstract

Lead oxide (PbO) is a candidate direct conversion material for medical X-ray applications. We produced various samples and detectors with thick PbO layers. X-ray performance data such as dark current, charge yield and temporal behaviour were evaluated on small functional samples. The influence of the metal contacts was studied in detail. We also covered large a-Si TFT-plates with PbO. Imaging results from a large detector with an active area of 18times20 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> are presented The detector has 960times1080 pixels with a pixel pitch of 184 mum. The MTF at the Nyquist frequency of 2.72 lp/mm is 50 %. Finally, a full size X-ray image is presented