1. A method for detecting anatomic landmarks and segmenting organs in a full or partial body computed tomography (CT) volume, comprising: detecting one or more predetermined slices of the CT volume; detecting a plurality of anatomic landmarks and organ centers in the CT volume, wherein each of the plurality of anatomic landmarks and organ centers is detected in a portion of the CT volume constrained based on one of the detected one or more predetermined slices; and segmenting a plurality of organs in the CT volume based on the detected organ centers and the detected anatomic landmarks.