Which of the following techniques relies on subtle shifts in blood flow to create a brain scan?

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Magnetic resonance imaging (MRI) relies on subtle shifts in blood flow to create a brain scan by using a strong magnetic field and radio waves to create detailed images of the brain's structure and function. Positron emission tomography (PET) uses a radioactive tracer to measure brain activity, electroencephalography (EEG) measures electrical activity in the brain, and electrocardiography (ECG) measures electrical activity in the heart.

Which of the Following Techniques Relies on Subtle Shifts in Blood