Magnetic+Resonance+Imaging+%28MRI%29
Here's your citation in American Psychological Association (APA) format:
Magnetic+Resonance+Imaging+%28MRI%29. (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=Magnetic%2BResonance%2BImaging%2B%2528MRI%2529