This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Radiology
MUGA scan not useful in:- 
Select and explain. 
A. Left ventricular ejection fractio, B. Regional wall motion, C. Regional wall perfusion, D. Stroke volume
C: Regional wall perfusion
Answer: C: Regional wall perfusion 
Explanation: MUGA - Multi-Gated Acquisition scan In this scan, Tc99-m labeled RBC area injected into the patient and gamma camera is focused on hea, then the emitted radio-active substances are assessed using the gamma camera. Useful for measuring Ventricular function of the hea, Ventricular ejection fraction, Stroke volume Ventricular wall motion.