How MRI Scan Works: The Science Behind the Image
Expertly Reviewed
Updated May 2026Dr. Avinash Kelkar, Chief Radiologist Director
The diagnostic imaging information on this page has been comprehensively reviewed for clinical accuracy by Omega PDS directors. All scan protocols and safety guidelines align with established clinical standards and over 33 years of institutional experience.
TL;DR Summary
MRI uses powerful magnets and radio waves to align hydrogen atoms in your body. When the radio waves are pulsed, these atoms emit signals that are converted into high-resolution 3D images.
The human body is mostly water, and water contains hydrogen atoms. In an MRI scanner, the strong magnetic field aligns the protons of these hydrogen atoms. Radiofrequency pulses then knock them out of alignment. As they realign, they emit signals that vary by tissue type, allowing the computer to build a detailed map of the body.
Safety Information
Because MRI uses magnetic fields, it is completely free of ionizing radiation. This makes it ideal for repeated scans and pediatric imaging.
Medical Statistics
Frequently Asked Questions
Why is the MRI machine so loud?
The noise is caused by rapidly switching gradient coils that change the magnetic field to localize the signal. We provide ear protection for your comfort.
Does the MRI machine move?
The table moves you into the scanner, but the machine itself does not have moving external parts like a CT scanner.
"Dr. Abhimanyu Kelkar explains that our 3T GE technology leverages the power of advanced physics to visualize tissue changes that are often invisible on standard 1.5T scanners."