Method and system for noise reduction in low dose computed tomography

摘要

A method includes de-noising projection data from a lower dose scan in the projection domain, reconstructing the de-noised projection data to generate volumetric image data, and de-noising the volumetric image data in the image domain. A system includes a projection domain processor (116) that de-noises projection data from a lower dose scan, a reconstructor (118) that reconstructs the de-noised projection data and generates image data, and an image domain processor (120) that de-noises the image data such that a noise level of the de-noise image data is substantially the same as an estimated image data noise level of image data for a higher dose scan.

主权项

1. A method, comprising:
de-noising projection data from a lower dose scan in the projection domain, wherein the lower dose scan corresponds to a scan which produces image data with a noise level that is higher than a predetermined target image data noise level; reconstructing the de-noised projection data to generate volumetric image data; determining a noise level of the image data; estimating a noise level for the image data of the higher dose scan; determining a ratio of the noise level of the higher dose scan to the noise level of the image of the lower dose scan; and de-noising the volumetric image data in the image domain based on the ratio.