Positron Emission Tomography in the Evaluation of Brain Tumors
Positron emission tomography (PET) has become a very valuable modality to evaluate different aspects of brain tumors. A good summary is given by two recent reviews [1,2]. Simply stated, PET allows the quantitative measurement of radioactivity in a target volume based on the annihilation of positrons. The spatial resolution of state-of-the-art commercial PET scanners is in the order of 4–5 mm. Just as important for tumor evaluation is the tracer used, because it is the nature of the tracer which determines the biological properties of the healthy or diseased tissues that are measured. The useful clinical applications of PET in the evaluation of brain tumors are summarized in Table 1.
KeywordsPositron Emission Tomography Brain Tumor Primary Central Nervous System Lymphoma Pilocytic Astrocytoma Radiation Injury