The present application discloses a CT system and a detection apparatus for the CT system. The detection apparatus includes: a high-energy detector assembly including a plurality of rows of high-energy detectors arranged along a predetermined trajectory; a low-energy detector assembly including a plurality of rows of low-energy detectors arranged at intervals along the predetermined trajectory, the low-energy detector assembly and the high-energy detector assembly being disposed in a stack; a number of rows of the low-energy detectors is smaller than a number or rows of the high-energy detectors; and each row of the low-energy detectors covers a row of high-energy detectors.

A method and corresponding arrangement for reconstructing an image based on spectral image data acquired for at least two different effective energies includes: obtaining a first set of spectral image data related to an object to be imaged and a second set of spectral image data related to a calibration phantom including at least one reference material; performing basis decomposition based on the first set of spectral image data, providing estimated basis images of the object to be imaged with respect to associated basis functions; performing basis decomposition based on the second set of spectral image data, providing calibrated estimates of reference basis coefficients corresponding to the at least one reference material; and determining image values representing the object based on a system model of an imaging system to be emulated, the estimated basis images and their associated basis functions, and the calibrated estimates of reference basis coefficients.

A method and a system for providing calibration for a photon counting detector forward model for material decomposition. The flux independent weighted bin response function is estimated using the expectation maximization method, and then used to estimate the pileup correction terms at each tube voltage setting for each detector pixel.

The present teaching relates to methods, systems, and apparatus for X-ray imaging with a detector capable of resolving photon energy. In one example, an X-ray microscope is disclosed. The X-ray microscope comprises an X-ray source and a detector. The X-ray source is configured for irradiating X-ray to a sample. The detector is configured for: detecting X-ray photons from the irradiated X-ray, determining energy of each of the detected X-ray photons, and generating an image of the sample based on detected X-ray photons that have energies in a predetermined range.

In an X-ray inspection, a detection unit with a detector is provided. The detection unit detects transmitted amounts of the X-rays generated by an X-ray generator and transmitted through the object in each of n-number X-ray energy bins (n is a positive integer of 2 or more) which are set in advance to the X-rays, and outputs detection signals corresponding to the transmitted amounts. An information acquisition unit acquires, based on the detection signal, information showing a thickness t of the object and an average linear attenuation coefficient μ in a transmission direction of fluxes of the X-rays, in each of the energy bins. A pixel data calculation unit calculates, based on the acquired information, pixel data composed of pixel values each obtained by multiplying addition information by the thickness t. Addition information is obtained by mutual addition of the average linear attenuation coefficients μ in the respective energy bins.

A high-pass x-ray filter device is disclosed that includes a substrate defining an elongated opening. A reflecting membrane is positioned across the opening and supported, along all sides, by the substrate. The reflecting membrane is configured to transmit, from an incident x-ray beam, x-ray photons having an energy above about a threshold energy level and reflects, from the incident x-ray beam, x-ray photons having an energy below about the threshold energy level. The elongated opening of the substrate defines an exit path for the transmitted x-ray beam. A high-pass x-ray filter system including the high-pass filter device and a method of fabrication of the high-pass filter device are also disclosed.

An image processing apparatus generates a material characteristic image based on a plurality of radiation images corresponding to a plurality of radiation energies, and estimates at least one of the plurality of radiation energies at a second timing using a plurality of material characteristic images including a material characteristic image generated based on a plurality of radiation images acquired at a first timing and a material characteristic image generated based on a plurality of radiation images acquired at the second timing later than the first timing.

An X-ray CT system includes an X-ray tube, an X-ray detector and processing circuitry. The processing circuitry is configured to cyclically change energy of the X-rays during one rotation of the X-ray tube around a subject. The processing circuitry is configured to perform a process including a correcting process addressing a difference in a transmission amount between X-rays having first energy and X-rays having second energy, on at least one selected from between: a plurality of first projection data sets acquired when the X-rays having the first energy were radiated; and a plurality of second projection data sets acquired when the X-rays having the second energy were radiated. The processing circuitry is configured to reconstruct an image on the basis of a combined data set generated on the basis of a plurality of projection data sets including the projection data sets resulting from the process.

A method and a system for providing calibration for a photon counting detector forward model for material decomposition. The flux independent weighted bin response function is estimated using the expectation maximization method, and then used to estimate the pileup correction terms at each tube voltage setting for each detector pixel.

The present application discloses a CT system and a detection apparatus for the CT system. The detection apparatus includes: a high-energy detector assembly including a plurality of rows of high-energy detectors arranged along a predetermined trajectory; a low-energy detector assembly including a plurality of rows of low-energy detectors arranged at intervals along the predetermined trajectory, the low-energy detector assembly and the high-energy detector assembly being disposed in a stack; a number of rows of the low-energy detectors is smaller than a number or rows of the high-energy detectors; and each row of the low-energy detectors covers a row of high-energy detectors.