For reliable quantification of the shear modulus of soft tissues, MR elastography (MRE) needs consistent methods of low-frequency wave induction to the region of interest in the human body. This work proposes two novel designs of 3D-printed mechanical actuators powered by compressed air. Driver A offers constant and specific actuation amplitude independent of the chosen frequency of wave induction. Driver B employs centripetal force for wave induction. Contrary to conventionally used air cushions, the amplitude increases at higher frequencies, thus, making it suitable for high frequency MRE and multi-source wave induction.
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