Radiation Oncology Glossary

The point in space where radiation beams from different gantry angles converge, typically placed within or near the targ...

Lines or surfaces connecting points of equal radiation dose in treatment planning displays.

Radiation-induced complications that develop months to years after completion of treatment.

Medical device that generates and delivers high-energy X-rays or electron beams for cancer treatment.

High-energy radiation beams with energies greater than 1 million electron volts, typically used for deep tumor treatment...

Imaging technique using treatment beam energies to acquire CT images for patient setup verification and adaptive plannin...

Process of converting fluence maps into deliverable multileaf collimator positions for IMRT treatment.

The process of determining the number of monitor units required to deliver the prescribed dose for each treatment field.

Advanced dose calculation method using statistical sampling to model radiation transport through patient anatomy.

Monitor Unit, the basic unit of measurement for radiation dose delivery calibrated to the output of a linear accelerator...

Device with multiple moveable tungsten leaves that shapes radiation beams to conform to target volumes.

Normal Tissue Complication Probability - model predicting likelihood of radiation-induced toxicity.

Critical normal structures that must be protected from excessive radiation exposure during treatment planning.

Normal tissues whose sensitivity to radiation may significantly influence treatment planning and dose limits.

Quality assurance measurements performed to verify the accuracy of individual patient treatment plans before delivery.

The region of gradually decreasing dose at the edge of a radiation beam, representing the transition zone between full d...

Quality assurance measurement using tissue-equivalent materials to verify dose calculation accuracy and treatment delive...

High-energy electromagnetic radiation used in external beam radiation therapy, typically from linear accelerators.

The clinical target volume plus margins to account for patient setup uncertainties and organ motion.

A verification radiograph taken through the treatment beam to confirm field placement and patient positioning.

The isodose curve that represents the prescribed radiation dose level, typically encompassing the target volume.

The specific anatomical location or reference point where the prescribed radiation dose is calculated and specified for...

Advanced radiation therapy technique using proton beams that deposit energy primarily at the tumor site with minimal exi...

Quantitative Analyses of Normal Tissue Effects in the Clinic - evidence-based dose-volume guidelines for organs at risk.