Fiducial marker

Pronunciation

Definition 1

A medical device or small object placed in or on the body to mark an area for radiation treatment or surgery. For example, tiny gold seeds may be put into the prostate to mark a tumor before radiation therapy. This allows the doctor to give higher doses of radiation to the tumor with less harm to nearby healthy tissue. (NCI Dictionary)

Definition 2

A medical device placed on or inserted in an anatomic site for accurate visualization of a particular area, prior to radiation treatment or surgery. Examples include markers inserted in the prostate gland for visualization of the site affected by cancer, prior to radiation therapy; markers taped to the scalp prior to imaging in frameless stereotactic brain surgery; and femoral and tibial pins used for spatial orientation in total knee replacement. (NCI Thesaurus)

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