Energy Window Selection for Bremsstrahlung 90Y SPECT-CT Imaging: A Phantom Study

Document Type : Original Paper

Authors

1 Physics Department, University of Trieste, Italy

2 Academic Hospital of Udine, Medical Physics Department, Italy

3 Hassan First University of Settat, High Institute of Health Sciences, Laboratory of Sciences and Health Technologies, Settat, Morocco

4 Department of Physics, LPHE, Modeling and Simulations, Faculty of Science, Mohammed V University, Rabat, Morocco

Abstract

Introduction: In Yttrium-90 SPECT imaging, the energy window and collimator used during projection acquisition can significantly affect image quality. In this work, we used a new and independent method to verify previous results, which suggest suitable energy around 130 keV.
Material and Methods: 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 filled with 90Y chloride. ISO-counting curve is a new method analysed in this study to evaluate the adequate parameters for 90Y SPECT imaging.
Results: HEGP collimator was the most suitable for acquisitions of 90Y bremsstrahlung radiation from the point of view of the correct volume reproduction. ISO-counting analyses have shown that for the bigger phantom spheres, the optimum acquisition energy is centered on 130 keV.
Conclusion: The ISO-counting curve method is consistent to previous studies’ results and can help to improve image quality.

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Main Subjects

References

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Iranian Journal of Medical Physics
Volume 19, Issue 1
January and February 2022
Pages 43-48

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History

  • Receive Date: 15 August 2020
  • Revise Date: 19 January 2021
  • Accept Date: 14 February 2021

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