Oncologic Radiology Glossary

MRI technique measuring tissue enhancement kinetics following contrast agent administration.

The characteristic appearance of contrast uptake and distribution within tissues on contrast-enhanced imaging studies.

Describing lesions that demonstrate increased uptake of FDG radiotracer on PET imaging studies.

The border area where adjacent radiation treatment fields meet, requiring careful planning to avoid dose inhomogeneity.

Fluid-attenuated inversion recovery MRI sequence that suppresses cerebrospinal fluid signal.

The visible or palpable tumor mass that can be detected by physical examination or imaging studies.

A hazy lung abnormality on CT imaging that preserves visibility of underlying vessels and bronchi.

Delayed imaging phase showing liver-specific contrast agent uptake by functioning hepatocytes.

Irregular, non-uniform contrast uptake pattern within a lesion, often indicating malignancy or complex pathology.

An area that appears darker than surrounding tissue on CT imaging due to lower X-ray attenuation.

A radiotherapy technique using frequent imaging during treatment to verify patient positioning and target localization f...

Modified response criteria specifically designed to evaluate tumor response to immunotherapy agents.

A radiation therapy technique that modulates beam intensity across the treatment field to conform dose distribution to t...

Advanced radiation delivery technique using varying beam intensities to create conformal dose distributions.

Standardized criteria for evaluating treatment response in brain tumors receiving immunotherapy.

A line connecting points of equal radiation dose on a treatment planning map, similar to elevation contours on a topogra...

Having the same signal intensity as a reference tissue on MRI, typically appearing as similar brightness or darkness.

Kilovoltage peak; the maximum electrical potential applied across an X-ray tube, determining beam penetration and image...

Radiation-induced complications occurring months to years after treatment completion.

Abnormal contrast uptake in the thin membranes covering the brain and spinal cord, often indicating tumor spread.

A standardized reporting system for hepatic observations in patients at risk for hepatocellular carcinoma, providing dia...

Abnormal enlargement of lymph nodes, often evaluated in oncologic imaging for staging and treatment response assessment.

Milliampere-seconds; the product of tube current and exposure time, controlling the quantity of X-ray photons produced.

Quantitative measure of total disease burden based on metabolically active tumor tissue in PET imaging.