Voltage or laser-light triggers are often used to synchronize auxiliary devices to the MR acquisition process. A very simple RF antenna and associated circuit is proposed here instead. The device is used here to trigger ultrasound probe firings, as part of a hybrid ultrasound-MRI system, but could be used for other purposes as well. Compared to scanner-generated triggers, advantages include: 1) vendor- and software release-independent, 2) available in the scan room, 3) no change to product sequences needed, and 4) the little device proved handy for pulse sequence debugging as well.
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