A guide for the radiation oncologist evaluating fiducial markers in IGRT and SBRT. Each topic below opens a focused post on one clinical scenario, with the published evidence cited on the page.
The migration data, the platform compatibility notes and the full peer-reviewed paper list follow the topic index.
Gold Anchor™
Each card opens a focused post on Gold Anchor's role in that scenario, with the published evidence cited inline.
Conventional coil and cylindrical fiducials migrate up to 19–47 %. Can a 0.32 % migration rate change how prostate SBRT is planned?
Read this LiverWhen the target moves with every breath, what does it take to get from 5.3 mm soft-tissue alignment error down to 1.5 mm?
Read this LungRoughly one in five standard coil markers migrate in lung parenchyma. What changes with a fold-anchor design and a thinner needle?
Read this Particle therapyWhat is the proton-fluence perturbation at clinical energies — and how do Gold Anchor fiducials compare to gold cylinders and titanium markers?
Read thisThe Hidden Risk
Published prospective series consistently document significant marker migration rates — particularly in sites with respiratory motion. When a marker migrates, the entire planning registration built around it is invalidated.
The dosimetric consequence is silent: the delivery system executes the plan with sub-millimetre precision — to the wrong location.
The Gold Anchor is a folding gold-iron wire with multiple cut-outs machined along its body. When the marker exits the needle tip, the cut-outs allow it to fold and mechanically interlock with surrounding tissue — independent of friction. It cannot drift back toward the needle path.
Developed at
Karolinska University Hospital, Stockholm
Invented by Dr. Ingemar Manufacturer — co-inventor of SBRT (1991) together with physicist Prof. Ingmar Lax and Dr. Henric Blomgren. The clinical evidence base is built into the product's origin.
Selected Publications
Cost-Effectiveness of Gold Anchor Markers in Prostate Cancer IGRT
Dominant strategy — lower cost AND higher QALYs
Five-Year Institutional Experience: Intra-prostatic Gold Anchor Insertion
795 patients · Zero migration during radiotherapy
Fiducial Markers Allow Accurate and Reproducible Delivery of Liver SBRT
Positioning error 1.5 mm (with fiducials) vs 5.3 mm (without)
MRI Visibility of Gold Fiducial Markers for Image-Guided Radiotherapy of Rectal Cancer
MRI-visible gold markers validated for rectal cancer IGRT
Real-time Gated Proton Therapy: Commissioning and QA
Proton therapy IGRT with Gold Anchor fiducials validated
Endoscopic Gold Fiducial Marker Placement for Muscle-Invasive Bladder Cancer
Endoscopic bladder-wall placement feasibility confirmed
Watch First
Gold Anchor: Fiducial Markers in Precision Radiotherapy
Educational overview · 7 minutes · Manufacturer · 2025
Saxsons Group is the exclusive distributor of Gold Anchor fiducial markers in India. We provide import documentation, in-service clinical training and application support.