Abstract: Disclosed is an X-ray sensor having an active detector region including detector diodes on its surface. The X-ray sensor further includes a junction termination surrounding the surface region including the detector diodes. The junction termination includes a guard arranged closest to the end of the surface region, a field stop outside the guard and at least two field limiting rings, FLRs arranged between the guard and the field stop. A first FLR is arranged at a distance ?1 from the guard selected from the interval [4 ?m; 12 ?m], a second FLR is arranged at a distance ?2 from the first FLR selected from the interval [6.5 ?m; 14 ?m], and wherein the distance ?2 is larger than the distance ?1. The proposed technology also provides a method for constructing such an X-ray sensor and an X-ray imaging system including an X-ray detector system that includes such X-ray sensor.

Abstract: A thermal management system and method for cooling a CT detector assembly of a CT imaging system. The thermal management system uses a combination of air cooling for the readout electronics of the CT detector assembly and liquid cooling for the X-ray sensors of the CT detector assembly. The hybrid air and liquid cooling systems and methods may be coupled together in the thermal management system and method to create a cooler temperature in the CT detector assembly. The CT detector assembly components may include CT detector modules, which may include X-ray sensors, readout electronics and other components.

Abstract: There is provided a circuit (502; 503; 504) configured for operation with a multi-bin photon-counting x-ray detector (20) having multiple energy thresholds, wherein said circuit (502; 503; 504) is configured to obtain or generate several Total Time-Over-Threshold (TTOT) signals corresponding to several different energy thresholds, and provide energy integrating information based on said several TTOT signals.

Abstract: A method for reconstructing image data from x-ray data measured with an imaging system having at least one photon-counting detector includes obtaining a representation of data measured by the photon-counting detector. The method also includes generating first image data based on a projection based first functional using a first algorithm, the projection based first functional being dependent on the representation of data. The method also includes updating, based on a second functional that includes a model of at least one physical effect not included in the projection based first functional, the first image data to obtain second image data. The invention also provides an image processing device configured to reconstruct image data from x-ray data measured with an imaging system including at least one photon-counting detector as well as a corresponding computer program product.

Abstract: There is provided a method of image reconstruction based on energy-resolved image data from a photon-counting multi-bin detector or an intermediate storage. The method comprises processing (S1) the energy-resolved image data by performing at least two separate basis decompositions using different number of basis functions for modeling linear attenuation, wherein a first basis decomposition is performed using a first smaller set of basis functions to obtain at least one first basis image representation, and wherein a second basis decomposition is performed using a second larger set of basis functions to obtain at least one second basis image representation. The method also comprises reconstructing a first image based on said at least one first basis image representation obtained from the first basis decomposition, and combining the first image with information representative of said at least one second basis image representation.

Abstract: There is provided a method of image reconstruction based on energy-resolved image data from a photon-counting multi-bin detector or an intermediate storage. The method comprises processing (S1) the energy-resolved image data by performing at least two separate basis decompositions using different number of basis functions for modeling linear attenuation, wherein a first basis decomposition is performed using a first smaller set of basis functions to obtain at least one first basis image representation, and wherein a second basis decomposition is performed using a second larger set of basis functions to obtain at least one second basis image representation. The method also comprises reconstructing a first image based on said at least one first basis image representation obtained from the first basis decomposition, and combining the first image with information representative of said at least one second basis image representation.

Abstract: There is provided a method for at least partly determining the orientation of an edge-on x-ray detector with respect to the direction of x-rays from an x-ray source. The method includes obtaining (S1) information from measurements, performed by the x-ray detector, representing the intensity of the x-rays at a minimum of two different relative positions of a phantom in relation to the x-ray detector and the x-ray source, the phantom being situated between the x-ray source and the x-ray detector and designed to embed directional information in the x-ray field when exposed to x-rays. The method also includes determining (S2) at least one parameter associated with the orientation of the x-ray detector with respect to the direction of x-rays based on the obtained information from measurements and a geometrical model of the spatial configuration of the x-ray detector, x-ray source and phantom.

Abstract: The current invention applies to photon counting silicon x-ray detectors with energy discriminating capabilities and applications in x-ray imaging systems. The overall image quality produced by such a system is improved by the presented novel methods for optimally using the energy information in Compton events and making selective use of counts induced from charges collected in neighboring pixels. The pile-up problem during high-flux imaging regimes is reduced by a novel method for signal reset, which improves the count efficiency by reducing the risk of losing event due to signal pile-up in the read out electronics chain.