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This paper presents a direct photon-counting X-ray image detector with a photoconductor for high-quality medical imaging applications. The proposed sampling-based charge preamplifier with asynchronous self-reset enables a pixel to detect single X-ray photon energy with higher sensitivity and faster processing rate. The use of the correlated double sampling enabled by the sampling-based...
The photon-counting method is one of several useful image-detection methods for digital X-ray imaging. The direct-type photon-counting method [1–3] has higher X-ray-to-charge conversion efficiency and position resolution compared with the indirect-type detection method [4]. Therefore, direct-type detection is more suitable for medical imaging applications for which the dose efficiency and the image...
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