Precisely characterizing motion tracking modalities in the MRI bore is quite a challenge. Especially when not only static positions ought to be evaluated, but also dynamic characterization is desired. In this work, we show how a compliant mechanism in the form of a folded-beam suspension can be utilized for accurate dynamic positioning. A piezoelectric actuator drives the system, and position feedback is acquired with a laser interferometer. Testing the system with short-wave motion tracking revealed a sub-micrometre agreement.