Which of the following techniques is dependent upon the release of oxygen from hemoglobin molecules?

Question

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fMRI (functional magnetic resonance imaging) relies on the release of oxygen from hemoglobin molecules to measure changes in blood flow and oxygenation levels in the brain. This technique enables researchers to identify which areas of the brain are active during specific tasks or cognitive activities. PET (positron emission tomography) and rCBF (regional cerebral blood flow) also measure blood flow in the brain but do so using different methods. MRI (magnetic resonance imaging) is a structural imaging technique that does not measure brain activity.

Which of the Following Techniques Is Dependent Upon the Release