An apparatus comprises a first anatomic positioner for migrating a first anatomic part of a patient on a patient platform. The first anatomic positioner comprises an arch structure being configured to be operable for engaging the patient's shoulder area. A strap structure is joined to the arch structure to extend caudally along the patient's side. A locking system is configured to be operable for longitudinal movement along a side of the patient platform and for being locked at a position along the movement. The locking system is further configured for engaging the strap structure for pulling the arch structure to caudally migrate the first anatomic part. Another apparatus further comprises a second anatomic positioner for migrating a second anatomic part of a patient on a patient platform, the second anatomic positioner comprising a mirror image of the first anatomic positioner.
