PET-CT
Also written as: PET-CT — Positron Emission Tomography-Computed Tomography
Hybrid imaging combining positron emission tomography with computed tomography for cancer staging and surveillance.
Full Definition
Positron Emission Tomography-Computed Tomography (PET-CT) is a hybrid imaging modality that combines functional metabolic imaging with anatomical detail for comprehensive cancer evaluation. In head and neck oncology, PET-CT using fluorodeoxyglucose (FDG) is valuable for initial staging, detection of unknown primary tumors, assessment of treatment response, and surveillance for recurrence. The metabolic activity shown by PET helps distinguish viable tumor from post-treatment changes, while CT provides precise anatomical localization. PET-CT has become standard of care for many head and neck cancer protocols, though interpretation requires understanding of post-treatment inflammatory changes.
Usage
Usage note: Specify FDG tracer when relevant; timing post-treatment affects interpretation.
In Context
- "Staging PET-CT revealed hypermetabolic bilateral cervical lymphadenopathy suspicious for metastatic disease." — Imaging report
- "Post-treatment PET-CT at 12 weeks showed complete metabolic response with no residual FDG uptake." — Follow-up assessment