Abstract
Positron emission tomography or PET is now considered one of the most important clinical imaging modalities, particularly in the fields of oncology, neurology and cardiology. In the past 5 years, hybrid scanners that combine the technologies of PET and computed tomography (CT) have become the instrument of choice for most imaging clinics. This presentation will discuss the instrumentation, data acquisition and image reconstruction associated with state-of-the-art PET and PET-CT systems. This talk will review the basics of positron emission, annihilation coincidence detection and instrumentation design. It will review detector designs in state-of-the-art PET systems including the choice of detector materials. We will also describe both 2D and 3D PET data acquisition modes and the merits of each. We will discuss random coincidences, scatter and attenuation correction and current approaches being used to correct for these. We will also review the methods currently sued to reconstruct these data. At the end of this presentation, the participants will be able to 1. list 3 detector materials routinely used in PET and at least one advantage or disadvantage of each, 2. describe the difference between 2D and 3D PET data acquisition, 3. discuss 2 advantages and 2 disadvantages of CT-based attenuation correction and list 3 approaches to reconstruction and 2 advantages of each.
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