Canon Medical Systems Corporation

Kabushiki Kaisha Toshiba

Toshiba Medical Systems Corporation

Ilmar Hein

Yu Zou

Xiaohui Zhan

Xiaofeng Niu

Ruoqiao Zhang

An X-ray scanner system is provided. The system includes a photon-counting detector, a memory, and processing circuitry. The detector has a plurality of detector pixels in a channel direction. The memory stores a detector response forward model of the photon-counting detector. The detector response forward model is to be used during image reconstruction of an imaging object. The processing circuitry estimates an attenuation profile of the imaging object, determine, with respect to each of the plurality of detector pixels, a set of spatial weights, based on the estimated attenuation profile, and update, based on the determined set of spatial weights, the detector response forward model stored in the memory.

Detector response calibaration data weight optimization method for a photon counting x-ray imaging system

A method and a system for providing calibration for a polychromatic photon counting detector forward counting model. Measurements with multiple materials and known path lengths are used to calibrate the photon counting detector counting response of the forward model. The flux independent weighted bin response function is estimated using the expectation maximization method, and then used to estimate the pileup correction terms at plural tube voltage settings for each detector pixel. The beam hardening corrections are then applied to the measured projection data sinogram, and the corrected sinogram is reconstructed to the counting image at the selected single energy.

Counting response and beam hardening calibration method for a full size photon-counting CT system

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Vernon Hills, IL, United States of America

Ilmar Hein