System and method of optimizing a representation of dual energy spectral CT images

摘要

An imaging system includes an x-ray source, a detector, a data acquisition system (DAS) operably connected to the detector, and a computer operably connected to the DAS. The computer is programmed to obtain CT scan data with two or more incident energy spectra, decompose the obtained CT scan data into projection CT data of a first basis material and a second basis material, generate a first basis material image and a second basis material image using the decomposed projection CT data, generate a first monochromatic image from the first basis material image and the second basis material image at a first energy that is selected based on an amount of correlated noise at the first energy, noise-reduce the first monochromatic image to generate a noise-reduced first monochromatic image, and generate a final monochromatic image based at least on the noise-reduced first monochromatic image.

主权项

1. An imaging system comprising:
an x-ray source that emits a beam of x-rays toward an object to be imaged; a detector that receives the x-rays attenuated by the object; a data acquisition system (DAS) operably connected to the detector; and a computer operably connected to the DAS and programmed to:
obtain CT scan data with two or more incident energy spectra;decompose the obtained CT scan data into projection CT data of a first basis material and a second basis material;generate a first basis material image and a second basis material image using the decomposed projection CT data;generate a first monochromatic image from the first basis material image and the second basis material image at a first energy that is selected based on an amount of correlated noise at the first energy;noise-reduce the first monochromatic image to generate a noise-reduced first monochromatic image; andgenerate a final monochromatic image based at least on the noise-reduced first monochromatic image; and wherein the computer is further programmed to:
noise-reduce the first basis material image to generate a noise-reduced first basis material image;generate a noise-reduced second basis material image using the noise-reduced first monochromatic image and the noise-reduced first basis material image; andgenerate the final monochromatic image using the noise-reduced second basis material image.