washout kinetics
The pattern and rate at which contrast material clears from tissues over time on dynamic imaging studies.
Full Definition
Washout kinetics describe the temporal changes in contrast enhancement within tissues during dynamic CT or MRI examinations. In oncologic radiology, these patterns help differentiate benign from malignant lesions and characterize tumor vascularity. Rapid washout typically suggests malignancy, while slow or persistent enhancement may indicate benign processes. The analysis involves measuring enhancement values at multiple time points after contrast administration, creating time-enhancement curves that reveal tissue perfusion characteristics. Understanding washout patterns is crucial for accurate diagnosis of liver lesions, adrenal masses, and other tumors where enhancement characteristics guide management decisions.
Usage
Usage note: Use 'washout' as a single compound word; describe specific timing phases for clarity.
In Context
- "The hepatic lesion demonstrated rapid arterial enhancement with washout kinetics typical of hepatocellular carcinoma." — Liver MRI report
- "Washout kinetics on the delayed phase helped differentiate the adrenal adenoma from metastasis." — Adrenal CT interpretation