rftools

ephemeral RF/MRI coil calculators · rfcoil v0.0.1

Rigorous, ephemeral RF-coil calculators for the bench

Three calculators, each calling the real rfcoil library (no reimplemented physics):

  • Loop L/R — self-inductance, skin-effect resistance, unloaded Q, distributed-cap sizing and critical array overlap from rfcoil.geometry, with the closed-form ~1% validation shown alongside the numeric result.
  • Resonance & Tuning — tuning C for your target frequency (default 127.74 MHz / 3T), verified via a real rfcoil.network.Network sweep, plus DESIGN.md's analytic tolerance-quadrature model and a Monte Carlo yield against your loaded bandwidth.
  • Z↔S — impedance/S conversion at arbitrary complex per-port reference impedance via rfcoil.renorm, with power reflection and preamp noise-mismatch penalty reported side by side, never a single S11.
Zero storage. This app has no database and writes no files. Every number you enter is used to compute a response and then discarded — nothing you submit is logged, cached, or persisted anywhere. Access logging is disabled at the server.

Loop inductance & resistance

Advanced
Enter loop geometry and compute.

Resonance & tuning

Monte Carlo
Enter loop L/R and compute.

Z↔S converter

Coil-side impedance matrix Z & reference z0
Preamp noise parameters (optional)
Preamp actual Zin (optional, informational only)
Enter an impedance and compute.