Tc99 Strontium Pyrophosphate

Q-21. Hot spot in acute MI is seen in: (DNB 09, AI 03)
a) Thallium
b) Strontium
c) Tc99 Strontium Pyrophosphate
d) Gallium Citrate

Answer: Tc99 Strontium Pyrophosphate
Explanation:
Myocardium perfusion:
Thallium scan
Myocardial infarction:
Cold spot/ Non-avid infarct imaging- Thallium (Tl)-201 (< 12-48 hours post infarct)
Hot spot/Avid infarct imaging-Tc-99m pyrophosphate (> 10-12 hours post infarct)
It shows doughnut pattern- Central cold effect due to necrosis in large infarct
Important point:
Only tumor producing hot nodules: Wertheim’s tumor/Adeno-lymphoma