Gold Anchor is great for proton therapy
- The thinner (0.28 mm diameter) Gold Anchor markers cause very little dose perturbation when they are implemented with a line shape.
- The high density material – gold – provides good visibility with kV imaging.
- The film measurements below show dose perturbation for a Gold Anchor implanted with a line-shape (assumed to form more of a zigzag shape) vs. regular gold markers.
Dose perturbation downstream of the markers with the markers oriented perpendicular to the beam axis near the end of the SOBP (Spread-Out Bragg Peak). The dose is normalized to an unperturbed region.
Source: Extract from “Investigation of dosimetric effects of radiopaque fiducial markers for use in proton beam therapy with film measurements and Monte Carlo simulations”