<prompt> Which is used for calculation of ejection fraction?MUGASPECT using thallium 201PET myocardial perfusion imagingSestamibi scan with pharmacological stress  <response>: Nuclear Imaging of hea: MUGA scan Multi-gated acquisition scan: Tc 99m labeled RBC is used Evaluate ventricular function ejection fraction- Cardiac ventriculography but most accurate investigation for ventricular function is -MRI Tc99m labeled RBC is very sensitive investigation for detecting minimal lower GIT bleeding as low as 0.1 ml per minute PET scanning in hea: - N-13 ammonia PET very sensitive for myocardial perfusion -18 FDG-PET Myocardial bility If N-13 ammonia PET - 18 FDG PET - - Suggestive of scar tissue If N-13 ammonia PET - 18 FDG PET - Hibernating myocardium Note: C-11 methionine PET is better than 18 FDG PET - for brain tumors 