METHODS AND APPARATUS FOR WEIGHTING OF COMPUTED TOMOGRAPHY DATA
First Claim
1. A method for reconstructing an image of an object utilizing a computed tomographic (CT) imaging system having a radiation source and a multislice detector array on a rotating gantry, the radiation source configured to project a beam of radiation through an object and towards the multislice detector array, the multislice detector array configured to sense attenuation of the radiation passing through the object;
- said method comprising;
helically scanning an object with a computed tomographic imaging system to acquire a plurality of views of projection data at a plurality of gantry angles and a plurality of cone angles;
generating a plurality of cone angle dependent weights that are inversely correlated to an absolute value of a cone angle; and
weighting the projection data using the cone angle dependent weights.
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Abstract
A method for reconstructing an image of an object utilizing a computed tomographic (CT) imaging system is provided. The CT system includes a radiation source and a multislice detector array on a rotating gantry, with the radiation source configured to project a beam of radiation through an object and towards the multislice detector array. The multislice detector array is configured to sense attenuation of the radiation passing through the object. The method for reconstructing an image includes helically scanning an object with a computed tomographic imaging system to acquire a plurality of views of projection data at a plurality of gantry angles and a plurality of cone angles, generating a plurality of cone angle dependent weights that are inversely correlated to an absolute value of a cone angle, and weighting the projection data using the cone angle dependent weights.
16 Citations
16 Claims
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1. A method for reconstructing an image of an object utilizing a computed tomographic (CT) imaging system having a radiation source and a multislice detector array on a rotating gantry, the radiation source configured to project a beam of radiation through an object and towards the multislice detector array, the multislice detector array configured to sense attenuation of the radiation passing through the object;
- said method comprising;
helically scanning an object with a computed tomographic imaging system to acquire a plurality of views of projection data at a plurality of gantry angles and a plurality of cone angles;
generating a plurality of cone angle dependent weights that are inversely correlated to an absolute value of a cone angle; and
weighting the projection data using the cone angle dependent weights. - View Dependent Claims (2, 3, 4, 5)
- said method comprising;
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6. A computed tomographic (CT) imaging system for reconstructing an image of an object, said computed tomographic (CT) imaging system comprises a radiation source and a multislice detector array on a rotating gantry, said radiation source configured to project a beam of radiation through an object and towards said multislice detector array, said multislice detector array configured to sense attenuation of said radiation passing through the object;
said imaging system configured to;
helically scan an object with a computed tomographic imaging system to acquire a plurality of views of projection data at a plurality of gantry angles and a plurality of cone angles;
generate a plurality of cone angle dependent weights that are inversely correlated to an absolute value of a cone angle; and
weight the projection data using the cone angle dependent weights. - View Dependent Claims (7, 8, 9, 10)
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11. A computer for collecting computed tomography (CT) scan data, said computer programmed to:
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helically scan an object with a computed tomographic imaging system to acquire a plurality of views of projection data at a plurality of gantry angles and a plurality of cone angles;
generate a plurality of cone angle dependent weights that are inversely correlated to an absolute value of a cone angle; and
weight the projection data using the cone angle dependent weights. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification