摘要 |
An x-ray imaging technology, performing an x-ray dark-field CT imaging of an examined object using an imaging system, which comprises an x-ray source, two absorbing gratings G1 and G2, an x-ray detector, a controller and a data processing unit, comprising the steps of: emitting x-rays to the examined object; enabling one of the two absorbing gratings G1 and G2 to perform phase stepping motion within at least one period range thereof; where in each phase stepping step, the detector receives the x-ray and converts it into an electric signal; wherein through the phase stepping of at least one period, the x-ray intensity at each pixel point on the detector is represented as an intensity curve; calculating a second moment of scattering angle distribution for each pixel, based on a contrast of the intensity curve at each pixel point on the detector and an intensity curve without presence of the examined object; taking images of the object at various angles, then obtaining an image with scattering information of the object in accordance with a CT reconstruction algorithm. |
申请人 |
TSINGHUA UNIVERSITY;NUCTECH COMPANY LIMITED |
发明人 |
HUANG, ZHIFENG;CHEN, ZHIQIANG;ZHANG, LI;WANG, ZHENTIAN;XING, YUXIANG;ZHAO, ZIRAN;XIAO, YONGSHUN |