Energy window optimization for Bremsstrahlung Y90 SPECT-CT imaging : a phantom study

Document Type : Original Paper

Authors

1 Physics Department, University of Trieste, Italy

2 Academic hospital of Udine

3 Physics,Faculty of sciences, University Mohammed V Rabat

4 Physics, faculty of sciences, University Mohammed V Rabt

5 Departement of Physics, Laboratory of High Energy Physics, Modelling and Simulation, Faculty of Science, Mohammed V Agdal University, Rabat, Kingdom of Morocco

Abstract

Introduction:
In Yttrium-90 SPECT imaging, the energy window and collimator used during acquisition can have a major effect on image quality. In this work, we used a new and independent method to verify the prevoius results suggest different energy ranges, but all centered at 130 keV.

Materials and method:
We used Siemens Symbia SPECT-CT system fitted with High Energy General Purpose (HEGP), Medium Energy General Purpose (MEGP) and Low Energy High Resolution (LEHR) to acquire data from NEMA IEC PET Body Phantom with its 6 different spheres of 3.7, 2.8, 2.2, 1.7, 1.3, 1.0 cm diameter.

Results:
HEGP collimator is the most suitable for acquisitions of 90Y bremsstrahlung radiation from the point of view of the correct volume reproduction.
For the bigger sphere’s study, the optimum ISO-counting curves is related to the energy range centred in 130 keV.
Conclusion:
The results obtained are consistent with previous studies. The Iso Counting Curves method can help to improve image quality.

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Main Subjects



Articles in Press, Accepted Manuscript
Available Online from 14 February 2021
  • Receive Date: 15 August 2020
  • Revise Date: 19 January 2021
  • Accept Date: 14 February 2021