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Radio Frequency Laboratory of the Wald Group at MGH

This page contains resources for RF coil design, fabrication, and testing related to the work conducted in the RF Lab of the | Magnetic Resonance Physics and Instrument Group (MR-PIGs), led by Dr. Lawrence Wald, at the A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, MA, USA.

• Visiting group members

(August 2020): Version 1 of a low-cost Mini Circuits-based RF low noise preamplifier added

(March 2020): A few small bugs have been fixed on the fiber optic interface board. New versions of the board files are now available.

(July 2019): Revision C of the open-source shim amplifier are now available online. Please see Current driver section below.

(JULY 2016): MATLAB code is now available for multi-coil shimming simulations. The code includes helmet-style wire patterns and a constrained optimization script for finding optimal shim currents for B0 shimming of the brain. Please see the Multi-coil B0 shimming section below.

Questions? Please email Jason Stockmann at jstockmann@mgh.harvard.edu

This page is under construction -- thank you for your patience as we upload materials...

Resources

• Multi-channel current driver board

• Multi-coil B0 shimming research methods (including shim arrays in PUMCIN format)

• Information and How-To guides for building RF coils

• PIN Diode Driver (8-channel)

• 3T Toroidal Chokes

• Low-noise RF Preamplifier

• LT-SPICE simulations of RF receive coil element tuning and matching

• Low-cost 1 Watt RF power amplifier (in progress)

• Spin echo generator board (in progress)

• 12ch ASL Shim Coil (in progress)

• High-power switching and control system for concurrent TMS and MRI (under construction...)

Links to other Wikis in the Wald Group

• Link to anthropomorphic phantom wiki
• Link to pTx wiki
• Link to tabletop educational MRI scanner wiki
• Link to Magnetic Particle Imaging (MPI) wiki