Method and apparatus for 3D reconstruction of images
AssigneeGeneral Electric Company
InventorsXiangyang Tang, Jiang Hsieh, Sandeep Dutta, Roy Arnulf Helge Nilsen
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Abstract
A method for producing an image of an object includes scanning an object with an imaging apparatus to collect projection data of the object utilizing cone sampling. The projection data is rebinned in a row-wise, fan-to-parallel fashion to produce rebinned data and the rebinned data is view-weighted to produce view-weighted data. The method further includes filtering the view-weighted data utilizing a row-wise ramp filter to produce filtered data and generating an image of the object utilizing the filtered data and a three-dimensional (3D) backprojection.
Claims45
A method for producing an image of an object, said method comprising:
- scanning the object with an imaging apparatus to collect projection data of the object utilizing cone sampling;
- performing virtual three-dimensional (3D) parallel sampling of the projection data by:
- rebinning the projection data in a row-wise, fan-to-parallel fashion to produce rebinned data;
- generating a virtual detector array based on the rebinned data;
- view-weighting the rebinned data of the virtual detector array to produce 3D view-weighted data;
- and
- filtering the 3D view-weighted data utilizing a tangential row-wise ramp filter to produce filtered data by implementing said filtering along rows of the virtual detector array and along a tangential direction with respect to a trajectory of a radiation source;
- and
- generating an image of the object utilizing the filtered data and a 3D backprojection.
A method for producing an image of an object, said method comprising:
- scanning the object with an imaging apparatus to collect projection data of the object utilizing cone sampling;
- performing virtual three-dimensional (3D) parallel sampling of the projection data by:
- rebinning the projection data in a row-wise, fan-to-parallel fashion to produce rebinned data;
- generating a virtual detector array based on the rebinned data;
- filtering the rebinned data of the virtual detector array utilizing a tangential row-wise ramp filter to produce filtered data by implementing said filtering along rows of the virtual detector array and along a tangential direction with respect to a trajectory of a radiation source;
- and
- view-weighting the filtered data utilizing a 3D weighting function to produce 3D view-weighted data;
- and
- generating an image of the object utilizing the 3D view-weighted data and a 3D backprojection.
An imaging apparatus comprising a radiation source and a multi-row detector array, said radiation source configured to project a radiation beam through an object towards said detector array, said apparatus configured to:
- scan the object to collect projection data of the object utilizing cone sampling;
- perform virtual three-dimensional (3D) parallel sampling of the projection data by:
- rebinning the projection data in a row-wise, fan-to-parallel fashion to produce rebinned data;
- generating a virtual detector array based on the rebinned data;
- view-weighting the rebinned data of the virtual detector array to produce 3D view-weighted data;
- and
- filtering the 3D view-weighted data utilizing a tangential row-wise ramp filter to produce filtered data by implementing filtering along rows of the virtual detector array and along a tangential direction with respect to a trajectory of a radiation source;
- and
- generate an image of the object utilizing the filtered view-weighted data and a 3D backprojection.
An imaging apparatus comprising a radiation source and a multi-row detector array, said radiation source configured to project a radiation beam through an object towards said detector array, said apparatus configured to:
- scan the object to collect projection data of the object utilizing cone sampling;
- perform virtual three-dimensional (3D) parallel sampling of the projection data by:
- rebinning the projection data in a row-wise, fan-to-parallel fashion to produce rebinned data;
- generating a virtual detector array based on the rebinned data;
- filtering the rebinned data of the virtual detector array utilizing a tangential row-wise ramp filter to produce filtered data by implementing filtering along rows of the virtual detector array and along a tangential direction with respect to a trajectory of a radiation source;
- and
- view-weighting the filtered data utilizing a 3D weighting function to produce 3D view-weighted data;
- and
- generate an image of the object utilizing the 3D view-weighted data and a 3D backprojection.
Dependencies are inferred from the claim text.