Photon-counting x-ray detectors for CT

A Radon-based criterion for the energy resolution of photon counting x-ray detectors

Thanks to recent developments in photon counting detectors, X-Ray spectral imaging has received increasing attention. This technique permits the quanti cation of the chemical components in an object. The energy selectivity of the detector is known to have a strong impact in the material decomposition capabilities of an imaging device. Although spectral imaging devices are widely used in conjunc...

A unified statistical framework for material decomposition using multienergy photon counting x-ray detectors.

PURPOSE Material decomposition using multienergy photon counting x-ray detectors (PCXD) has been an active research area over the past few years. Even with some success, the problem of optimal energy selection and three material decomposition including malignant tissue is still on going research topic, and more systematic studies are required. This paper aims to address this in a unified statis...

Modeling the frequency-dependent detective quantum efficiency of photon-counting x-ray detectors.

PURPOSE To find a simple model for the frequency-dependent detective quantum efficiency (DQE) of photon-counting detectors in the low flux limit. METHODS Formula for the spatial cross-talk, the noise power spectrum and the DQE of a photon-counting detector working at a given threshold are derived. Parameters are probabilities for types of events like single counts in the central pixel, double...

Energy calibration of energy-resolved photon-counting pixel detectors using laboratory polychromatic x-ray beams

Recently, photon-counting detectors capable of resolving incident x-ray photon energies have been considered for use in spectral x-ray imaging applications. For reliable use of energy-resolved photon-counting detectors (ERPCDs), energy calibration is an essential procedure prior to their use because variations in responses from each pixel of the ERPCD for incident photons, even at the same ener...

Extension of cascaded systems analysis to single-photon-counting x-ray detectors