Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Eur J Nucl Med Mol Imaging. 2011 May;38 Suppl 1:S10-8. doi: 10.1007/s00259-011-1768-2. Epub 2011 Apr 12.

Quantitative imaging of 124I and 86Y with PET.

Author information

  • 1Department of Medical Physics and PET Centre, Uppsala University Hospital, Uppsala, Sweden. mark.lubberink@akademiska.se

Abstract

The quantitative accuracy and image quality of positron emission tomography (PET) measurements with (124)I and (86)Y is affected by the prompt emission of gamma radiation and positrons in their decays, as well as the higher energy of the emitted positrons compared to those emitted by (18)F. PET scanners cannot distinguish between true coincidences, involving two 511-keV annihilation photons, and coincidences involving one annihilation photon and a prompt gamma, if the energy of this prompt gamma is within the energy window of the scanner. The current review deals with a number of aspects of the challenge this poses for quantitative PET imaging. First, the effect of prompt gamma coincidences on quantitative accuracy of PET images is discussed and a number of suggested corrections are described. Then, the effect of prompt gamma coincidences and the increased singles count rates due to gamma radiation on the count rate performance of PET is addressed, as well as possible improvements based on modification of the scanner's energy windows. Finally, the effect of positron energy on spatial resolution and recovery is assessed. The methods presented in this overview aim to overcome the challenges associated with the decay characteristics of (124)I and (86)Y. Careful application of the presented correction methods can allow for quantitatively accurate images with improved image contrast.

PMID:
21484385
[PubMed - indexed for MEDLINE]
PMCID:
PMC3098993
Free PMC Article

Images from this publication.See all images (12)Free text

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Springer Icon for PubMed Central
    Loading ...
    Write to the Help Desk