A practical limitation of MRI/fMRI related to environment?

• A. Movement may affect pictures
• B. They are loud
• C. They are quick
• D. They do not require consent

Answer: (A)

In MRI and fMRI, staying perfectly still inside the scanner is essential because the strong magnetic fields and rapid gradient changes are highly sensitive to motion. Even small movements blur the image and create artifacts, which can mislocalize brain activity or contaminate functional signals. This makes movement a key practical limitation tied to the environment, since the confined, noisy setting can make it hard for participants to remain still, often requiring repetition of scans or correction techniques. While the loudness is another environmental factor, it’s movement that most directly compromises image quality and data interpretation.