How MRI Sees Inside the Body
Hydrogen nuclei and radio waves show body slices
0:58 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
Click a time to play from that scene.
How MRI Sees Inside You
An MRI scanner uses a strong magnet and radio waves to take cross-sectional images of the body.
Hydrogen Nuclei in the Body
The water and fat in your body contain many hydrogen nuclei, and each one acts like a tiny magnet.
A Strong Field Aligns Them
The strong field of a superconducting magnet lines up the nuclei, and at a speed set by the field strength, they wobble.
Radio Waves In, Signal Out
Radio waves at the same frequency tip the nuclei over, and when the waves stop, they emit radio waves as they return. This is nuclear magnetic resonance.
Gradients Reveal Position
Gradient coils vary the field little by little, so frequency reveals position, and a computer builds the image.
Return Speed Sets Contrast
Each tissue returns at a different speed, which creates contrast. MRI uses no X-rays, and the loud noise comes from switching the gradient coils.
Imaging by Nuclear Resonance
MRI uses the resonance of hydrogen nuclei to image the inside of the body.
Create 3D explainer videos like this sample from your documents and chat
Just attach product documents, drawings, or CAD data and tell the AI in chat what video you want. The AI plans the storyboard, builds the 3D scenes, and turns it into a video with narration and captions. You pay only for what you use (a rough guide is about 3,500 credits for a 1-minute video with 2 small revisions).
