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

Document Type : Original Paper


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


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.

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.
The results obtained are consistent with previous studies. The Iso Counting Curves method can help to improve image quality.


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