A support apparatus configured to support a patient's anatomy, the support apparatus comprising: at least one support configured to support a patient's anatomy, the at least one support comprising: at least one top portion ; and at least one base portion ; at least one locator configured to removably locate the support apparatus to a patient table of a target modality; at least one directional guide having a set distance of travel; at least one shuttle coupled to the at least one support , the shuttle being configured to slidably adjust the support along the at least one directional guide ; at least one releasable lock configured to restrict movement of the at least one shuttle along the at least one directional guide in a first engaged configuration, and enable movement of the at least one shuttle along the at least one directional guide in a second disengaged configuration; wherein a gross position of the support apparatus is selected by locating the at least one locator to a corresponding structure on the patient table of the target modality and wherein a position of the support apparatus may be finely adjusted in discrete increments along the set distance of travel of the at least one directional guide ; and wherein the base portion is removably attached to the at least one top portion , and is additionally coupled to the at least one directional guide , the at least one locator , the at least one shuttle , and the at least one releasable lock , wherein the at least one base portion is configured to be oriented in at least a first orientation and a second orientation, and wherein the at least one base portion is configured such that it will be at a first height in the first orientation and at a second height in the second orientation. at least one top portion ; and at least one base portion ; at least one locator configured to removably locate the support apparatus to a patient table of a target modality; at least one directional guide having a set distance of travel; at least one shuttle coupled to the at least one support , the shuttle being configured to slidably adjust the support along the at least one directional guide ; at least one releasable lock configured to restrict movement of the at least one shuttle along the at least one directional guide in a first engaged configuration, and enable movement of the at least one shuttle along the at least one directional guide in a second disengaged configuration; wherein a gross position of the support apparatus is selected by locating the at least one locator to a corresponding structure on the patient table of the target modality and wherein a position of the support apparatus may be finely adjusted in discrete increments along the set distance of travel of the at least one directional guide ; and wherein the base portion is removably attached to the at least one top portion , and is additionally coupled to the at least one directional guide , the at least one locator , the at least one shuttle , and the at least one releasable lock , wherein the at least one base portion is configured to be oriented in at least a first orientation and a second orientation, and wherein the at least one base portion is configured such that it will be at a first height in the first orientation and at a second height in the second orientation. <EOS>