MRI physics you can poke at.
Small, self-contained pages I built for teaching how MR images come to be. Each one runs entirely in the browser; nothing to install, nothing tracked.
Interactive
- 01
k-space navigator
Drive through k-space with gradient pulses like an Etch-a-Sketch. Fire an RF pulse, hold Gx and Gy, and watch the trajectory while the free induction signal decays under you.
- 02
Line-by-line reconstruction
Acquire k-space one phase-encode line at a time in sequential, centric or keyhole order and see truncation, blurring and Gibbs ringing appear in the image.
- 03
Spins and spatial frequency
Move the (kx, ky) sampling point and watch the phase pattern it imposes across a grid of spins, in the laboratory or the rotating frame.
- 04
Larmor precession
Individual nuclear spins at thermal equilibrium: precession around B0, Boltzmann populations, and why random phases sum to zero transverse magnetisation.
Slides
- 01