A multi-modality imaging system (100) includes a gantry (101), including at least first and second imaging modalities (102, 104) respectively having first and second bores (113, 112) arranged with respect to each other along a z-axis, and a subject support (108) that supports a subject for scanning. The gantry is configured to alternately move to a first position at which the subject support extends into the first bore of first imaging modality for scanning an extremity of the subject and to a second position at which the subject support extends into the second bore of second imaging modality for scanning the extremity of the subject.
