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In this work, an interventional device tracking method under high performance 0.55T MRI is presented using a custom designed nitinol needle. Ultra-thin miniature solenoid coil markers were designed and printed on the needle using conductive ink. A negative contrast is created around the needle by applying an alternative current to the markers and hence introducing an offset to the B1 field. A signal generator circuit is designed for supplying and controlling the AC signal and the visibility of the needle is tested under MRI with in-vitro experiments during a real time b-SSFP sequence.
Uzun et al. (Wed,) studied this question.
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