Multi-centre assessment of HRRT image uniformity via 68Ge and 18F cylindrical and anthropomorphic phantoms

Andrew J. Reader, Marzieh S. Tahaei, Arman Rahmim, Sune H. Keller, Stephan Blinder, Merence Sibomana, Jean Paul Soucy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To date, the high resolution research tomograph (HRRT) still offers the highest resolution PET imaging capability of the human brain. Spatial uniformity of the images is of paramount importance, as many radioligand studies require either accurate regional dynamic quantification or, at the very least, accurate measurement of relative activities between regions. Often uniform cylinders, of 68Ge or 18F, are used for quality control and calibration purposes. This work examines the spatial uniformity obtained in reconstructed images of uniform cylinders from seven different HRRT centres, using either 68Ge or 18F, and also considering a head and brain phantom filled with 18F scanned at three of the centres. To account for varying activity levels used in each centre's data acquisition, and possibly different image reconstruction parameters, a progressive smoothing method was used to analyze image uniformity, with metrics designed to assess non-uniformity in image planes as well as in randomly selected region of interest pairs. Unusually high image non-uniformities were found for germanium cylinders at two centres, but of greater concern was the fact that uniformity for the brain phantom was found to be notably inferior at two of the three centres which scanned the phantom. A change of mumap reconstruction parameters, and minor adjustment of a parameter used in the single scatter simulation, was shown to remedy the issue (reducing relative region errors to <5%).

Original languageEnglish (US)
Title of host publication2013 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781479905348
DOIs
StatePublished - Jan 1 2013
Event2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013 - Seoul, Korea, Republic of
Duration: Oct 27 2013Nov 2 2013

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Other

Other2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013
Country/TerritoryKorea, Republic of
CitySeoul
Period10/27/1311/2/13

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

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