Computed tomography with resolution recovery
A system and method for recovering resolution in an x-ray computed tomography system. The system includes an x-ray source, a two-dimensional sensing array, and a controller. The x-ray source projects an x-ray beam towards subject. The x-ray source includes an anode and a cathode, where the anode has a target for directing the x-ray beam. A two-dimensional sensing array receives an x-ray beam through the subject to generate an image. The target of the anode causes a shift variant blur of the x-ray beam received by the sensing array due to the angle between the target and the sensing array. The controller is in communication with the sensing array to control acquisition and processing of the image. The controller is configured to adjust for the shift variant blur of the x-ray beam.
1. A system for performing computed tomography, the system comprising:
an x-ray source configured to project an x-ray beam toward a subject, wherein the x-ray source includes an anode having a target;
a sensing array configured to receive the x-ray beam through the subject, to generate an image of the target area of the anode causing a shift variant blur of the x-ray beam received by the sensing array, the sensing array having a plurality of pixels; and
a controller in communication with the sensing array to control and process acquisition by the sensing array, the controller being configured to adjust for the shift variant blur of the x-ray beam, wherein the controller generates a model of the shift variant blur corresponding to a pattern of contribution of each voxel based on an angle between the target and each pixel of the sensing array.
2. The system of claim 1 , wherein the controller is configured to generate a matrix corresponding to the model.
3. The system of claim 2 , wherein the controller is configured to process the image based on the matrix to adjust for the shift variant blur.
4. The system of claim 1 , wherein the shift variant blur is modeled by the controller based on a location and orientation of the anode with respect to each pixel on the sensing array.
5. The system of claim 4 , wherein the shift variant blur is modeled by the controller based on dimensions of the target.
6. A method for performing computed tomography, the method comprising the steps of:
projecting an x-ray beam toward a subject using an anode having a target;
receiving the x-ray beam through the subject to a sensing array to generate an image, wherein the target causes a shift variant blur of the x-ray beam received by the sensing array, the sensing array having a plurality of pixels;
generating a model of the shift variant blur with a controller, said model corresponding to pattern of contribution of each voxel based on an angle between the target and each pixel of the sensing array; and
adjusting for the shift variant blur of the x-ray beam, using the controller.
7. The method of claim 6 , further comprising generating a matrix corresponding to the model.
8. The method of claim 7 , further comprising processing the image based on the matrix to adjust for the shift variant blur.
9. The method of claim 6 , further comprising modeling the shift variant blur based on a location and orientation of the target with respect to each pixel on the sensing array.
10. The method of claim 9 , wherein the shift variant blur is modeled based on dimensions of the target.
11. The system of claim 1 , wherein the model is generated based on the shift variant blur due to an apparent size of the target relative to a location and orientation of each pixel of the plurality of pixels.
12. The method of claim 6 , wherein the model is generated based on the shift variant blur due to an apparent size of the target relative to a location and orientation of each pixel of the plurality of pixels.
13. A system for performing computed tomography, the system comprising:
an x-ray source configured to project an x-ray beam toward a subject, wherein the x-ray source includes an anode having a target;
a sensing array configured to receive the x-ray beam through the subject, to generate an image of the target of the anode causing a shift variant blur of the x-ray beam received by the sensing array, the sensing array having a plurality of pixels;
a controller in communication with the sensing array to control and process acquisition by the sensing array, the controller being configured to adjust for the shift variant blur of the x-ray beam, wherein the controller generates a model of the shift variant blur due to the apparent size of the target based on the location and orientation of each pixel of the plurality of pixels.