Which imaging modality shows brain activity by measuring blood flow?

Which imaging modality shows brain activity by measuring blood flow?

• A. Telemedicine
• B. fMRI
• C. Medical Technology
• D. Patient Registration Technology

Answer: (B)

Brain activity is often inferred by how local blood flow changes in response to neural work. Functional MRI uses strong magnetic fields to detect these blood-oxygenation level dependent changes: when a brain area becomes active, blood flow to that area increases, altering the balance of oxyhemoglobin and deoxyhemoglobin and producing a signal that highlights active regions. This makes fMRI a powerful, noninvasive way to map which parts of the brain are working during a task. Other options don’t fit this mechanism. Telemedicine is about delivering care remotely, not imaging brain activity. Medical technology is a broad category that can include devices, but it isn’t a specific imaging method. Patient registration technology handles administrative aspects like enrollment and scheduling, not physiological imaging.

Brain activity is often inferred by how local blood flow changes in response to neural work. Functional MRI uses strong magnetic fields to detect these blood-oxygenation level dependent changes: when a brain area becomes active, blood flow to that area increases, altering the balance of oxyhemoglobin and deoxyhemoglobin and producing a signal that highlights active regions. This makes fMRI a powerful, noninvasive way to map which parts of the brain are working during a task.

Other options don’t fit this mechanism. Telemedicine is about delivering care remotely, not imaging brain activity. Medical technology is a broad category that can include devices, but it isn’t a specific imaging method. Patient registration technology handles administrative aspects like enrollment and scheduling, not physiological imaging.