PET vs SPECT question? Nuclear Cardiology

[Kemo]

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Why PET would underestimate EF compare to SPECT?

 

[IMreshopeful]

Why PET would underestimate EF compare to SPECT?

Any effect re high or low Temporal or spatial resolution? I know PET has better Spatial and Temporal resolution but why it would under estimate EF compare to SPECT?

I don’t ever recall hearing that PET underestimates EF. If anything you should get a more accurate one compared to SPECT