System and method for couch sag compensation

A method implemented on a computing device having at least one processor and at least one computer-readable storage medium, the method comprising:

• obtaining a first image slice affording a sagittal view relating to a region of interest (ROI) of a subject and a first couch supporting the subject, the first couch having a plurality of first positions reflected in the first image slice as a first conformation, the first image slice corresponding to a stack of third image slices affording axial views;
• obtaining a second image slice affording a sagittal view relating to the ROI of the subject and a second couch supporting the subject, the second couch having a plurality of second positions reflected in the second image slice as a second conformation;
• determining, based on the first conformation and the second conformation, a displacement field associated with the first image slice with respect to the second image slice, the displacement field including a plurality of displacement components, each third image slice of the stack corresponding to one displacement component of the plurality of displacement components;
• and
• adjusting, based on the displacement field, at least one third image slice.

A method implemented on a computing device having at least one processor and at least one computer-readable storage medium, the method comprising:

• obtaining a first image slice in a first view relating to a subject or a region of interest (ROI) of the subject and a first conformation, the first image slice corresponding to a stack of second image slices in a second view;
• and
• determining, based on the first conformation and a reference conformation, a displacement field associated with the first image slice with respect to the reference conformation, the displacement field including a plurality of displacement components, each second image slice of the stack corresponding to one displacement component of the plurality of displacement components;
• and
• adjusting, based on the displacement field, at least one of the stack of second image slices or spatial basis function representations corresponding to imaging data associated with the stack of second image slices.