Patent ID: 9111381
Filing Date: 2015-08-18
Classification: G06T

Abstract:
1. A method for tomographic reconstruction, the method comprising: obtaining measurement data from a tomographic imaging system along a set of line segments passing through an object; defining common X, Y, and Z axes for the set of line segments and for an image volume containing said line segments of the object; partitioning the set of line segments into an X-subset, a Y-subset and a Z-subset, wherein line segments in the X-subset are substantially not orthogonal to the X axis and are in a direction substantially more parallel to the X axis than the Y or Z axis, wherein line segments in the Y-subset are substantially not orthogonal to the Y axis and are in a direction substantially more parallel to the Y axis than the X or Z axis, and wherein line segments in the Z-subset are substantially not orthogonal to the Z axis and are in a direction substantially more parallel to the Z axis than the X or Y axis; forming slices perpendicular to the X axis by slicing the image volume in a dimension of the X, Y, and Z axes most orthogonal to the direction substantially more parallel to the X axis than the Y or Z axis; forming slices perpendicular to the Y axis by slicing the image volume in a dimension of the X, Y, and Z axes most orthogonal to the direction substantially more parallel to the Y axis than the X or Z axis; forming slices perpendicular to the Z axis by slicing the image volume in a dimension of the X, Y, and Z axes most orthogonal to the direction substantially more parallel to the Z axis than the X or Y axis; calculating backprojections of the X-subset, the Y-subset and the Z-subset to image data and forward projections of the image data to the X-subset, the Y-subset and the Z-subset on each slice, wherein slices perpendicular to the X axis are used for the X-subset, wherein slices perpendicular to the Y axis are used for the Y-subset, and wherein slices perpendicular to the Z axis are used for the Z-subset; and providing the backprojected and forward projected image data as an output.