Gain correction for a CT system
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsJongduk Baek, Norbert J. Pelc
Life of this patent
Estimating the term…
Abstract
A method for imaging unknown objects in a computed tomography (CT) system, comprising determining ray gain for a known object is provided. A CT reconstruction is performed with the known object to obtain reconstructed values. Ideal values are obtained for pixels of the known object. An error related to a difference between the reconstructed values and the ideal values is generated. A ray gain is estimated that reduces the error.
Claims20
A method for imaging unknown objects in a computed tomography (CT) system comprising at least one detector, at least one x-ray source, and a controller, wherein the controller executes the method comprising determining ray gain for a known object, comprising:
- a) performing CT reconstruction with the known object to obtain reconstructed values;
- b) obtaining ideal values for pixels of the known object;
- c) generating an error related to a difference between the reconstructed values and the ideal values;
- and
- d) estimating a ray gain that reduces the error.
A computed tomography (CT) system, comprising:
- a detector array;
- an x-ray source array;
- a display;
- a controller which receives data from the detector array and controls the display, comprising:
- at least one processor;
- and
- computer readable media, comprising:
- computer readable code for performing CT reconstruction with a known object to obtain reconstructed values;
- computer readable code for obtaining ideal values for pixels of the known object;
- computer readable code for generating an error related to a difference between the reconstructed values and the ideal values;
- computer readable code for estimating a ray gain that reduces the error;
- computer readable code for acquiring CT data for the unknown object;
- computer readable code for reconstructing a CT image of the unknown object by using the estimated ray gain;
- and
- computer readable code for displaying the CT image on the display.
Dependencies are inferred from the claim text.