Table 2.

Brain imagina modalities

Imaging modality	Description
Positron emission tomography	Measures regional glucose utilisation, cerebral blood flow (both measures of regional brain activity) and receptor occupancy.
Arterial spin labelling	Cerebral blood flow.
Electroencephalogram	Cerebral electrical activity.
Magnetoencephalography	Measures magnetic fields produced by electrical activity of the brain.
Magnetic resonance spectroscopy	Measures brain concentration of brain metabolites and neurotransmitters.
Structural MRI	Provides high spatial resolution and soft tissue contrasts to measure brain morphometry.
Functional MRI	Measures brain activity by detecting changes in blood oxygenation and flow during rest or an evoked task.
Diffusion tensor imaging	Assesses the microstructure of white matter and anatomical connectivity and integrity.