Oncologic Radiology Glossary
100 terms total — 5 showing — Last updated 15 Sep 2026
RTOG criteria RTOG
Radiation Therapy Oncology Group grading system for radiation-induced normal tissue toxicity and late effects.
brachytherapy
Radiation therapy technique involving placement of radioactive sources directly into or adjacent to tumor tissue for loc...
ground-glass opacity
A hazy lung abnormality on CT imaging that preserves visibility of underlying vessels and bronchi.
Minimum Detectable Activity
Lowest activity level that can be reliably detected by a nuclear medicine imaging system.
PACS
Picture Archiving and Communication System; a digital system for storing, retrieving, and distributing medical images ac...
skin spacing
The distance between the patient's skin surface and the radiation beam entry point, affecting dose to superficial tissue...