seqlab#

Write pulseq MRI pulse sequences in MATLAB syntax, run them entirely in your browser, and explore the resulting .seq files in an interactive viewer. No MATLAB, no installation — the unmodified pulseq +mr toolbox executes on numbl, a MATLAB-compatible runtime that runs in a web worker, and produces .seq files byte-identical to desktop MATLAB (including the md5 signature).

Also works as a plain .seq viewer: drop any pulseq 1.4/1.5 file onto the page and it is parsed instantly in JavaScript — no script run needed.

Features#

• Script workspace — MATLAB editor (CodeMirror) with the pulseq +mr package preloaded; press Run and watch the console stream. Scripts download as .m files that run unchanged in desktop MATLAB.
• Interactive timeline — RF magnitude/phase, gx/gy/gz, and ADC lanes with synchronized zoom/pan down to microsecond detail; click any block to inspect its events numerically.
• Sequence report — definitions, duration, event counts, peak gradient and slew, and md5 signature verification.
• Examples gallery — FID, EPI, and gradient-echo demos adapted from pulseq's demoSeq, linkable as #example/gre etc.

Development#

npm install
npm run dev          # local dev server
npm run engine-test  # headless: run the FID demo, byte-compare vs MATLAB golden
npm run parser-test  # .seq parser + reconstruction checks vs golden files
node scripts/run-example.mjs gre   # run any example headlessly, timed

The pulseq +mr tree is vendored under src/engine/pulseq/ (MIT, see the LICENSE there); re-sync it from a pulseq checkout with npm run vendor-pulseq.

Credits#

pulseq is developed at the University Medical Center Freiburg and is MIT-licensed. This project is not affiliated with the pulseq developers.