A trial of⁸⁹Sr bremsstrahlung SPECT

Objective: ⁸⁹Sr bremsstrahlung SPECT imaging has been evaluated for detecting the more detailed whole body ⁸⁹Sr distribution. Methods: ⁸⁹Sr bremsstrahlung whole body planar and merged SPECT images were acquired by using two detectors type SPECT system. Energy window A (100 keV ±50%) for planar imaging, and energy window A plus adjacent energy window B (300 keV±50%) for SPECT imaging were set on the continuous spectrum. Those images were compared with ^99mTc-H-MDP whole body planar and merged SPECT images. To verify the accumulation obtained by bremsstrahlung whole body planar and merged SPECT image, we made original phantom based on the counts of clinical study imaging. Results: On ⁸⁹Sr bremsstrahlung merged SPECT image, focal accumulations were recognized in the parts of ^99mTc-H-MDP merged SPECT accumulation. Focal accumulations were much clearer on ⁸⁹Sr bremsstrahlung merged SPECT imaging than those of whole body planar image Of ⁸⁹Sr bremsstrahlung. In phantom study, counts of each concentration linearly increase as acquisition time and number of rotation increase on planar and SPECT images. Conclusions: ⁸⁹Sr bremsstrahlung merged SPECT imaging would be useful for detecting the more detailed whole body ⁸⁹Sr distribution.