Collimator and energy window optimization for YTTRIUM-90 bremsstrahlung SPECT imaging

The optimal collimator and energy window for Yttrium-90 bremsstrahlung SPECT imaging was investigated in the study. Yttrium-90 images were acquired with a dual-head gamma camera, equipped with parallel hole collimators and 90Y vial for different energy windows ranging from 56 to 232 keV. Image quality parameters (sensitivity, %FOV, and S/B) were examined for the energy window and collimator combinations. It is concluded that the optimal SPECT imaging was achieved using FBP Method with a HEGP collimator and the energy window of 90–110 keV. •The quality of bremsstrahlung imaging depend on the energy window and collimator.•The image quality of 90Y for the energy windows above 150 keV were very low.•High energy collimation is preferable for 90Y imaging in high count rate cases.•The optimal acquisition energy window was founded as 90–110 keV for 90Y imaging.