Radiation Oncology Glossary
100 terms total — 4 showing — Last updated 26 Oct 2026
gross tumor volume
Visible and palpable tumor that can be detected by clinical examination and imaging.
acute toxicity
Side effects from radiation therapy that occur during or shortly after treatment completion.
fiducial marker
Radiopaque objects implanted near tumors to enable precise target localization and motion tracking during radiation ther...
MLC leaf sequencing
Process of converting fluence maps into deliverable multileaf collimator positions for IMRT treatment.
patient-specific QA
Quality assurance measurements performed to verify the accuracy of individual patient treatment plans before delivery.