photon counting detector

Abstract

A detector array includes at least one direct conversion detector pixel (114-114M) configured to detect photons of polychromatic ionizing radiation. The pixel includes a cathode layer (116), an anode layer (118), a direct conversion material (120), and a gate electrode, the anode layer including an anode electrode (118- 118M), the direct conversion material is placed between the cathode layer and the anode layer, and the gate electrode is placed in the direct conversion material parallel to and between the cathode layer and the anode layer.

Description

Technical field [0001] The following generally relates to a direct conversion photon counting detector, and is described through the specific application of computer tomography (CT); however, the following is also applicable to other imaging modalities. Background technique [0002] A computer tomography (CT) scanner includes a rotating gantry that is rotatably mounted to a fixed gantry. The rotating frame supports the X-ray tube. The detector array is located opposite the X-ray tube passing through the inspection area. The rotating gantry and the X-ray tube rotate about the longitudinal axis or z-axis around the inspection area. The X-ray tube is configured to emit multi-energy ionizing radiation that penetrates the inspection area and irradiates the detector array. The detector array includes a one-dimensional or two-dimensional array of detector pixels that detect radiation and generate signals indicative of the radiation. Each pixel is associated with a readout channel, w...

AI Technical Summary

Problems solved by technology

Also, photons scattered in a non-sensitive detector volume close to the sensitive detector volume can enter the sensitive detector volume, distorting the measured signal

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