Correction of ct images for truncated or incomplete projections
AssigneeWisconsin Alumni Research Foundation
InventorGuang-Hong Chen
Life of this patent
Estimating the term…
Abstract
A data consistency condition is derived for an array of attenuation values acquired with a fan-beam x-ray CT system. Using this data consistency condition, estimates of selected attenuation values can be calculated from the other attenuation values acquired during the scan. Such estimates reduce artifacts caused truncated data and by loss of data due to x-ray absorption.
Claims9
A method for correcting selected attenuation values in an array of attenuation values acquired with a fan-beam x-ray CT system, the steps comprising:
- a) filtering the attenuation values in the array with a first filtering kernel;
- b) rebinning the filtered attenuation values;
- and
- c) calculating estimates of the selected attenuation values by filtering the rebinned attenuation values with a second filtering kernel.
(canceled)
A method for estimating fan-beam projection data acquired from a subject at a selected projection angle, the steps comprising:
- a) acquiring fan-beam projection data from the subject at other projection angles;
- and
- b) estimating the fan-beam projection data from the acquired fan-beam projection data using a fan-beam data consistency condition.
Dependencies are inferred from the claim text.