Which neuroimaging technique can be used to compare ratios of oxyhemoglobin to deoxyhemoglobin?

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Functional magnetic resonance imaging (fMRI) can be used to compare ratios of oxyhemoglobin to deoxyhemoglobin, as it measures brain activity by detecting changes associated with blood flow. This technique relies on the fact that cerebral blood flow and neuronal activation are coupled. When an area of the brain is in use, blood flow to that region also increases. The oxygenated blood (oxyhemoglobin) and deoxygenated blood (deoxyhemoglobin) have different magnetic properties, and fMRI can detect these differences.

Which Neuroimaging Technique Can Be Used to Compare Ratios of Oxyhemoglobin