Systems and methods for treating a lung of a patient using guided radiation therapy or surgery

A marker for implantation into a patient, comprising:

• a capsule;
• a transponder in the capsule, the transponder including a circuit and an imaging element, the circuit configured to be energized by a wirelessly transmitted excitation energy and to wirelessly transmit a magnetic location signal in response to the excitation energy, the imaging element configured to make the capsule discernable in radiographic images;
• and
• an anchor attached to the capsule, the anchor comprising an expandable cylindrical section that has open ends, the expandable cylindrical section configured to move between a stored position having a first size and a deployed position having a second size greater than the first size, wherein, when in the deployed position, the open ends of the expandable cylindrical section allowing fluid flow therethrough in both directions,
• wherein the imaging element comprises a first contrast element and a second contrast element, the first contrast element and the second contrast element positioned at opposing ends of the transponder such that the marker has a radiographic centroid substantially coincident with a magnetic centroid of the transponder.