A portable vibration applicator (40) used in a magnetic resonance rheology imaging system (10) that applies mechanical vibrations to at least a portion of an object of interest (20) outputs a housing (54) and mechanical energy At least one transducer unit (48) configured to, and a piston (68) mechanically connected to the at least one transducer unit (48), wherein the piston (68) comprises a first End (70), second end (72), and opening (74) extending between first end (70) and second end (72), said housing ( 54) has at least one opening (60), the at least one opening (60) of the housing (54) and the opening (74) of the piston (68) being the first surface of the housing (54). The opening center (62) of the opening (60) in (56) and how In ring opening center (64) and the housing opening direction (66) defined by the opening (60) in the second surface (54) (58), at least partially overlap. The vibration applicator system (38) also includes a portable vibration applicator (40), a transducer drive unit (42) that activates at least one transducer unit (48), and at least a portion of the object of interest (20). A detection unit (50) configured to determine a physical quantity representing the amplitude of the applied mechanical vibration and providing an output signal representing the determined physical quantity, and a mechanical displacement amplitude of the transducer unit (48) are set. At least one closed loop control circuit, wherein the closed loop control circuit controls the transducer drive unit (42) based on the output signal received from the sensing unit (50). Configured to provide a signal.関心対象（20）の少なくとも一部に機械的振動を印加する、磁気共鳴レオロジー結像システム（10）において使用される携帯用振動アプリケータ（40）は、ハウジング（54）と、機械エネルギーを出力するように構成された少なくとも一つのトランスデューサユニット（48）と、前記少なくとも一つのトランスデューサユニット（48）に機械的に接続されたピストン（68）とを有し、前記ピストン（68）は、第1の端部（70）、第2の端部（72）、および第1の端部（70）と第2の端部（72）の間に延伸する開口（74）を有し、前記ハウジング（54）は、少なくとも一つの開口（60）を有し、該ハウジング（54）の少なくとも一つの開口（60）とピストン（68）の開口（74）とは、ハウジング（54）の第1の表面（56）における開口（60）の開口中心（62）と、ハウジング（54）の第
