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Published on: February 1, 2016
Quantitative PET with positron emitters that emit prompt gamma rays.
C C Martin1, B T Christian, M R Satter
1Health Sci. Center, Texas Univ., San Antonio, TX.
IEEE Transactions on Medical Imaging
|January 1, 1995
Summary
Quantitative positron emission tomography (PET) data is feasible using isotopes emitting prompt gammas. Standard PET instrumentation can acquire accurate data, though 3-D PET may face contamination challenges.
Area of Science:
- Nuclear Medicine
- Medical Imaging
- Physics
Background:
- Positron emission tomography (PET) relies on detecting pairs of annihilation photons.
- Prompt gammas emitted by some isotopes can interfere with PET data acquisition.
- This interference can lead to artifacts like increased dead time and invalid coincidences.
Purpose of the Study:
- To assess the feasibility of quantitative PET imaging using isotopes that emit prompt gammas.
- To evaluate the impact of prompt gammas on standard PET instrumentation.
- To determine the conditions under which quantitative PET data can be reliably obtained.
Main Methods:
- Scanning point sources of F-18, Na-22, and Co-60.
- Measuring prompt gamma and annihilation photon coincidence rates.
- Analyzing the effects of prompt gammas on dead time and coincidence validity.
Main Results:
- For Na-22, annihilation photon coincidences significantly outnumbered prompt gamma coincidences.
- Prompt gamma-annihilation photon coincidences were higher with scatter for Na-22 compared to F-18.
- Prompt gammas markedly increased dead time, with Co-60 showing a higher correction factor than N-13.
Conclusions:
- Quantitative PET data is achievable with prompt gamma-emitting isotopes using standard 2-D PET systems.
- Careful consideration is needed for 3-D PET acquisitions, where prompt gammas pose a greater contamination risk.
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