Medical Imaging Techniques and Applications

Positron Emission Tomography (PET), often combined with CT in a single scanner, detects the faint gamma rays emitted by radioactive tracers introduced into the body, revealing where metabolic activity is concentrated — a property tumors exploit as they consume glucose at unusually high rates. Reconstructing accurate, quantitative images from these signals requires correcting for tissue attenuation, scanner geometry, and noise, which together determine whether a lesion's tracer uptake can be measured precisely enough to track a tumor's response to therapy rather than merely its presence. Active directions include improving attenuation correction when MRI replaces CT, developing new molecular tracers that target specific cancer biology beyond glucose metabolism, and translating reconstruction methods validated in small-animal PET systems to clinical oncology workflows. The central open question is how to make quantitative PET measurements reliable enough across different scanners and institutions to serve as a true biomarker for treatment decisions.

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Keywords

PET/CTimagingcancertumorreconstructionmolecular