Oncologic Radiology Glossary

The three-dimensional volume of metabolically active tumor tissue measured on FDG-PET imaging using standardized thresho...

Lowest activity level that can be reliably detected by a nuclear medicine imaging system.

Multiparametric MRI combining multiple imaging sequences for comprehensive tissue characterization.

Cancer occurring in multiple distinct locations within the same organ or anatomic region.

A round or oval-shaped area of increased contrast uptake, typically indicating focal lesions or abnormal tissue.

A limited number of metastatic lesions that may be amenable to local therapy rather than systemic treatment.

Normal tissue structure requiring dose limitation during radiation therapy planning to prevent complications.

Picture Archiving and Communication System; a digital system for storing, retrieving, and distributing medical images ac...

Standardized criteria for assessing tumor response to therapy using quantitative PET imaging measurements.

An area of decreased or absent blood flow on perfusion imaging, potentially indicating vascular compromise or tissue nec...

Advanced MRI or CT technique that measures blood flow and vascular characteristics within tissues.

MRI technique measuring tissue blood flow and vascular characteristics using contrast bolus tracking.

A region of decreased radiotracer uptake on nuclear medicine scans, appearing as a cold spot relative to surrounding tis...

An area of decreased radiotracer uptake on nuclear medicine imaging, appearing as a 'cold spot' relative to surrounding...

Prostate Imaging Reporting and Data System standardizing prostate MRI interpretation and reporting.

In helical CT, the ratio of table advancement per rotation to the total beam collimation, affecting image quality and ra...

Geometric volume encompassing the clinical target volume plus margins for setup uncertainties and organ motion.

Inflammation of lung tissue, commonly occurring as a side effect of thoracic radiation therapy or certain chemotherapy a...

Morphologic liver changes mimicking cirrhosis caused by chemotherapy or metastatic disease.

Apparent tumor growth on imaging that represents treatment-related changes rather than true disease progression.

Apparent tumor shrinkage on imaging that does not represent true therapeutic response, often caused by anti-angiogenic t...

The additional margin added around the clinical target volume to account for setup uncertainties and organ motion during...

Evidence-based guidelines for radiation dose limits to normal tissues to minimize toxicity.

Quantitative imaging characteristic extracted from medical images using computational analysis methods.