Radiation Oncology Glossary

Electronic Portal Imaging Device - digital detector system for treatment verification and patient positioning.

Radiobiological concept representing the uniform dose that would produce the same biological effect as a non-uniform dos...

Radiopaque objects implanted near tumors to enable precise target localization and motion tracking during radiation ther...

The boundary region where two or more radiation fields meet in a treatment plan, requiring careful management to avoid d...

The technique of aligning adjacent radiation fields to ensure uniform dose distribution at field junctions.

A technique using subfields within the primary treatment field to improve dose homogeneity.

A radiation therapy delivery method that uses multiple open fields with different jaw positions to create a more uniform...

Linear accelerator beam delivery mode without flattening filters, producing higher dose rates with beam profile variatio...

Division of total radiation dose into multiple smaller treatments delivered over time.

Specialized stereotactic radiosurgery device using multiple cobalt-60 sources to deliver highly focused radiation to int...

The rotating structure of a linear accelerator that houses the treatment head and allows beam delivery from multiple ang...

Visible and palpable tumor that can be detected by clinical examination and imaging.

High dose rate brachytherapy delivering radiation at rates greater than 12 Gy per hour using a single high-activity radi...

Mathematical adjustments in dose calculations to account for varying tissue densities within the radiation beam path.

A quantitative measure of dose uniformity within the target volume, calculated as the ratio of maximum to minimum dose.

A standardized scale of X-ray attenuation coefficients used in CT imaging to differentiate tissue densities for radiatio...

A radiation therapy regimen using larger doses per fraction delivered over fewer treatment sessions than conventional fr...

International Commission on Radiation Units and Measurements, the organization that establishes standards for radiation...

Treatment approach using imaging during radiation delivery to improve targeting accuracy and account for anatomical chan...

Custom-fitted equipment used to maintain precise patient positioning and minimize movement during radiation treatments.

Advanced radiation delivery technique that modulates beam intensity to conform dose distribution to tumor shape.

Multileaf collimator leaf positioning technique where opposing leaves overlap to create complex field shapes and improve...

Relating to variations or changes that occur between individual radiation treatment fractions.

Motion or changes that occur within a single treatment fraction, typically referring to patient movement during radiatio...