Common-mask guided image reconstruction for enhanced four-dimensional cone-beam computed tomography

A method for constructing a plurality of images representing a four-dimensional computed tomography sequence of an object from a plurality of projections, the projections being taken from a plurality of angles with respect to the object and at a plurality of times, first portions of the object being less static than second portions of the object, the method comprising:

• using at least one processor:
• iteratively processing projections of the plurality of projections for a plurality of groups, each group of the plurality of groups comprising projections collected while the first portions of the object are in corresponding locations, with each iteration comprising:
• reconstructing first image portions representing the first portions of the object, the reconstructing of each first image portion of the first image portions being based on projections in a respective group of the plurality of groups;
• and
• reconstructing a second image portion, the second image portion representing the second portions of the object, based on projections in multiple groups of the plurality of groups and on the reconstructed first image portions.

A computer-readable storage medium encoded with executable instructions that, when executed by at least one processor, cause the at least one processor to perform a method for constructing a plurality of images representing a four-dimensional computed tomography sequence of an object from a plurality of projections, the projections being taken from a plurality of angles with respect to the object and at a plurality of times, first portions of the object being less static than second portions of the object, the method comprising:

• using at least one processor:
• iteratively processing projections of the plurality of projections for a plurality of groups, each group of the plurality of groups comprising projections collected while the first portions of the object are in corresponding locations, with each iteration comprising:
• reconstructing first image portions representing the first portions of the object, the reconstructing of each first image portion of the first image portions being based on projections in a respective group of the plurality of groups;
• and
• reconstructing a second image portion, the second image portion representing the second portions of the object, based on projections in multiple groups of the plurality of groups and on the reconstructed first image portions.