Pencil Beam Scanning

**Semantic type:** Therapeutic or Preventive Procedure

**Definition:** A precise form of proton therapy that uses an electronically guided scanning system and magnets to deliver a proton beam that is millimeters wide. With this system, beam position and depth can be controlled, allowing for highly precise deposition of radiation to be delivered in all three dimensions of the tumor.

**Synonyms:** - PBS - Pencil Beam Proton Scanning