This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
[{'content': 'Tc HMPAO SPECT is used for: \nSelect and explain. \nA. Cerebral perfusion imaging, B. Renal imaging, C. Parathyroid imaging, D. Thyroid imaging', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A. Cerebral perfusion imaging* Tc HMPAO SPECT is used for cerebral perfusion assessment. For example, in Alzheimer's it shows reduced perfusion of the temporoparietal region.* D-SPECT represents the next step in the evolution of SPECT technology and is based on a unique acquisition geometry. It has nine arrays of cadmium zinc telluride (CZT) detectors, each of which rotates around its central axis with programmable angular rotation.", 'role': 'assistant'}]