Abstract
Several reviews on specific topics related to positron emission tomography (PET) ranging in complexity from introductory to highly technical have already been published. This introduction to the analysis of PET data was written as a simple guide of the different phases of analysis of a given PET dataset, from acquisition to preprocessing, to the final data analysis. Although sometimes issues specific to PET in neuroimaging will be mentioned for comparison, most of the examples and applications provided will refer to oncology. Due to the limitations of space we couldn’t address each issue comprehensively but, rather, we provided a general overview of each topic together with the references that the interested reader should consult. We will assume a familiarity with the basic principles of PET imaging.
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Glossary
- Annihilation event:
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As the radioisotope undergoes decay by positron emission, the emitted positron travels in tissue for a short distance (typically less than 1 mm), until it decelerates to a point where it can interact with an electron of the surrounding tissue. The encounter annihilates both electron and positron (annihilation event), producing a pair of annihilation photons (gamma rays), moving in approximately opposite directions, which are detected by the PET scanner.
- Coincidence event:
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The raw data collected by a PET scanner are a list of “coincidence events” representing near-simultaneous detection (typically, within a window of 6–12 ns of each other) of annihilation photons by a pair of detectors. The line in space connecting the two detectors along which the positron emission occurred is called line of response (LOR).
- Dead time:
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Time after each event during which the detector of the scanner is not able to record another event.
- Attenuation correction:
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Only a fraction of the emitted photons are able to reach the PET scanner; a significant fraction, highly dependent on the organ being imaged, is absorbed by the surrounding tissue. This phenomenon (attenuation) must be corrected for, or the resulting images will be biased with a higher activity at the edge of the imaged object (i.e. in a brain scan, not correcting for attenuation will give rise to images where the activity of the skull is erroneously overestimated).
- Scattered coincidence:
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A scattered coincidence is one in which at least one of the detected photons has undergone at least one (or more) Compton scattering prior to detection. Since the direction of the photon is changed during the Compton scattering process, the resulting coincidence event will be assigned to the wrong LOR. Scattered coincidences add a background to the true coincidence distribution which changes slowly with position and add statistical noise to the signal. The number of scattered events detected depends on the volume and attenuation characteristics of the object being imaged, and on the geometry of the camera.
- Random coincidences:
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Random coincidences occur when two photons arising from different annihilation events are detected within the coincidence time window of the system and therefore attributed to the same annihilation event. As with scattered events, the number of random coincidences detected depends on the volume and attenuation characteristics of the object being imaged, and on the geometry of the camera. The distribution of random coincidences is fairly uniform across the FOV, and will cause isotope concentrations to be overestimated if not corrected for.
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Tomasi, G., Aboagye, E.O. Introduction to the analysis of PET data in oncology. J Pharmacokinet Pharmacodyn 40, 419–436 (2013). https://doi.org/10.1007/s10928-013-9307-3
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DOI: https://doi.org/10.1007/s10928-013-9307-3