What is fMRI?
Functional Magnetic Resonance Imaging (fMRI) is a non-invasive imaging technique that measures and maps brain activity. Unlike traditional MRI, which provides images of brain structure, fMRI detects changes in blood flow, revealing how different parts of the brain function during various tasks and states.
How it's Performed
Preparation
- Screening: As with standard MRI, you'll be asked about metal implants and metal objects must be removed.
- Comfort: Wear comfortable clothing without metal fastenings. Earplugs or headphones may be provided to reduce noise.
During the Procedure
- Positioning: You will lie on a motorized table that slides into the MRI scanner.
- Task Performance: You might be asked to perform simple tasks, such as tapping your fingers or looking at images, to stimulate brain activity.
- Imaging Process: The scanner detects changes in blood oxygen levels, which correlate with neural activity. The data is used to create maps of brain function.
- Duration: Typically takes between 30 to 90 minutes, depending on the study's complexity.
Post Procedure
- After the fMRI scan, the images are reviewed and analyzed by a radiologist. This detailed analysis is then compiled into a report and shared with your doctor. The information aids in diagnosing mental health conditions, planning treatments, and monitoring progress.
Who Can Have One?
Safe for most individuals, including children and adults.
Contraindications
- Implants and Devices:Similar to MRI, not suitable for individuals with certain implants or metal fragments, and generally avoided in the first trimester of pregnancy.
- Pregnancy: Generally avoided unless absolutely necessary.
- Claustrophobia: Options for open MRI or sedation may be available.