CTE Sessions at EANM’13

EANM’13 – Mini Course I

October 20, 2013, 14:30 – 15:30
Reconstructions: TrueX +TOF, PSF, OSEM

Chairpersons: H. Ryder (Dublin), J. Jorge (Lausanne)

S. Rep (Ljubljana):
Reconstruction Techniques Used in Nuclear Medicine and PET/CT Imaging
R. Boellaard (Amsterdam):
Overview of State of the Art PET Image Reconstruction Technologies

Educational objectives:

  1. Define the main reconstruction algorithms used in Nuclear Medicine and PET/CT imaging
  2. Explain the basics of reconstruction techniques, filtered back-projection, stacking, iterative reconstruction
  3. Explain the use of TOF in image acquisition and image reconstruction
  4. Using NM and PET/CT imaging, show differences in image quality using different reconstruction algorithms
  5. Explain how technologist involvement in standardising reconstruction can benefit the resultant images
  6. Show how errors in reconstruction can result in inadequate images


Tomographic imaging in Nuclear Medicine (SPECT; SPECT/CT)) and PET/CT depends on the robust ability of the computer software required to reconstruct the resultant images accurately and in a readable format for both qualitative and quantitative assessment. Reconstruction algorithms, both analytical and iterative, have been designed to perform such tasks, but different manufacturers have used different methodologies to achieve the final images. This session is designed to review some of those algorithms (TrueX +TOF, PSF, OSEM) and how their use in the production of 2D and 3D diagnostic images can be adapted for local use.

By the end of the session, the technologist should:

  • Acquire a basic knowledge of statistically based iterative reconstruction
  • Be familiar with an innovative image processing technology
  • Understand the impact of PSF and TOF on image quality in reconstruction

Key Words:

Algorithmes, OSEM, True-X, PSF, OSEM, Image Production, Quantitative, Qualitative

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