Method and apparatus for adaptive scatter correction

摘要

A CT system includes a rotatable gantry having an opening to receive an object to be scanned, an x-ray source configured to project an x-ray beam toward the object having a primary intensity, a detector configured to detect high frequency electromagnetic energy passing through the object and output imaging data, and a data acquisition system (DAS) connected to the detector and configured to receive the imaging data. The system also includes a computer programmed to obtain image projection data of the object from the DAS, correct the projection data using a scatter function that is based at least on a known characteristic of the x-ray beam, and generate images using the corrected projection data.

主权项

1. A Computed Tomography (CT) system comprising:
a rotatable gantry having an opening to receive an object to be scanned; an x-ray source configured to project an x-ray beam toward the object, the x-ray beam having a primary intensity; a detector configured to detect energy from the x-ray beam passing through the object and output imaging data; a data acquisition system (DAS) connected to the detector and configured to receive the imaging data; and a computer programmed to:
obtain image projection data of the object from the DAS;correct the image projection data using a scatter function that is based at least on a known characteristic of the x-ray beam and a characteristic of the object; andgenerate images using the corrected projection data; and wherein the scatter function comprises a function of the formI⁡(β)f⁡(I⁡(β))·(-ln⁢I⁡(β)Io)  that represents a level of scatter of the x-ray beam as a function of transmission intensity, where I(β) is the x-ray beam transmission intensity along the x-ray transmission direction indicated by the angle β, ƒ(I(β)) is an adaptive function, and Io is the primary intensity incident upon the object along a given direction.