Methods and systems for forming images with radiation

Abstract

Disclosed herein is a method comprising: obtaining a signal at a pixel in an array of pixels of a radiation detector, wherein the signal is generated from radiation incident on the radiation detector; obtaining a corrected signal by correcting the signal with a combination of a set of reference signals generated from the radiation at a set of reference pixels in the array, wherein a set of weights are respectively applied to the set of reference signals in the combination; and forming an image based on the corrected signal; wherein the set of weights is a function of a location of the pixel with respect to the array.

What is claimed is: 
     
         1 . A method comprising:
 obtaining a signal at a pixel in an array of pixels of a radiation detector, wherein the signal is generated from radiation incident on the radiation detector;   obtaining a corrected signal by correcting the signal with a combination of a set of reference signals generated from the radiation at a set of reference pixels in the array, wherein a set of weights are respectively applied to the set of reference signals in the combination; and   forming an image based on the corrected signal;   wherein the set of weights is a function of a location of the pixel with respect to the array.   
     
     
         2 . The method of  claim 1 , wherein each pixel in the array of pixels encompasses a portion of a radiation absorption layer of the radiation detector. 
     
     
         3 . The method of  claim 2 , wherein the signal is generated from charge carriers produced in the radiation absorption layer by the radiation. 
     
     
         4 . The method of  claim 1 , wherein the set of weights is a function of relative positions of the set of reference pixels with respect to the pixel. 
     
     
         5 . The method of  claim 1 , wherein the pixel is a member of the set of reference pixels. 
     
     
         6 . The method of  claim 1 , wherein the radiation is X-ray or gamma ray. 
     
     
         7 . The method of  claim 1 , wherein the signal and the set of reference signals are generated during the same time period. 
     
     
         8 . The method of  claim 1 , wherein the combination is a sum of the set of reference signals with the set of weights applied thereto. 
     
     
         9 . The method of  claim 1 , wherein the signal represents an intensity of the radiation at the pixel. 
     
     
         10 . A computer program product comprising a non-transitory computer readable medium having instructions recorded thereon, the instructions when executed by a computer implementing a method of  claim 1 . 
     
     
         11 . A system comprising:
 a radiation detector configured to generate a signal at a pixel in an array of pixels of the radiation detector from radiation incident on the radiation detector;   a processor configured to obtain a corrected signal by correcting the signal with a combination of a set of reference signals generated from the radiation at a set of reference pixels in the array, wherein a set of weights are respectively applied to the set of reference signals in the combination;   wherein the processor is configured to form an image based on the corrected signal;   wherein the set of weights is a function of a location of the pixel with respect to the array.   
     
     
         12 . The system of  claim 11 , wherein each pixel in the array of pixels encompasses a portion of a radiation absorption layer of the radiation detector. 
     
     
         13 . The system of  claim 12 , wherein the signal is generated from charge carriers produced in the radiation absorption layer by the radiation. 
     
     
         14 . The system of  claim 11 , wherein the set of weights is a function of relative positions of the set of reference pixels with respect to the pixel. 
     
     
         15 . The system of  claim 11 , wherein the pixel is a member of the set of reference pixels. 
     
     
         16 . The system of  claim 11 , wherein the radiation is X-ray or gamma ray. 
     
     
         17 . The system of  claim 11 , wherein the signal and the set of reference signals are generated during the same time period. 
     
     
         18 . The system of  claim 11 , wherein the combination is a sum of the set of reference signals with the set of weights applied thereto. 
     
     
         19 . The system of  claim 11 , wherein the signal represents an intensity of the radiation at the pixel.