Method and apparatus for reconstructing image acquisitions for extended fields-of-view

An imaging system comprising:

• a gantry comprising an aperture having an imaging volume in which a subject is disposed, the gantry comprising an X-ray source and a detector array arranged to rotate about an isocenter of the gantry;
• and
• at least one processor configured to:
• spin the gantry a first time to capture via the detector array a first set of images of a central region of the imaging volume;
• spin the gantry a second time to capture via the detector array a second set of images of an annulus region of the imaging volume surrounding the central region;
• generate first projected and interpolated padding data for a first image of the central region by projecting and interpolating image data on a second detector plane associated with the detector array being in a second orientation and second position for capturing the second set of images to an extended portion of a first detector plane associated with the detector array being in a first orientation and first position for capturing the first set of images, the first set of images comprising the first image of the central region, and the second set of images comprising the first image of the annulus region;
• generate a first extended image of the central region based on the first projected and interpolated padding data;
• generate second projected and interpolated padding data for the first image of the annulus region by projecting and interpolating image data on the first detector plane to an extended portion of the second detector plane;
• generate a first extended image of the annulus region based on the second projected and interpolated padding data;
• and
• perform back projection to reconstruct an extended field-of-view image of the imaging volume based on the first extended image of the central region and the first extended image of the annulus region.