TY - CONF AB - In neurosurgery, delineation of tumor boundaries during resection of brain tumors is of substantial relevance. During operation distinction between tumor and healthy tissue rely on the abilities of the surgeon based on visual and tactile differentiation. In this paper a high sensitivity actuator-sensor system using a piezoelectric bimorph is presented. Frequency shift and transfer function of the bimorphpsilas voltages are detected and evaluated. Sensorpsilas sensitivity is evaluated using two frequency controls strategies: A phase-locked loop (PLL) and a self-oscillating circuit. Results of measurements conducted on gel-phantoms are presented and discussed. AU - Uribe, David Oliva AU - Stroop, Ralf AU - Hemsel, Tobias AU - Wallaschek, Jörg ID - 9576 KW - biomedical measurement KW - brain KW - cancer KW - neurophysiology KW - phantoms KW - phase locked loops KW - piezoelectric actuators KW - surgery KW - tactile sensors KW - transfer functions KW - tumours KW - PLL KW - biomedical tissue differentiation system KW - brain tumor resection KW - frequency control KW - frequency shift KW - gel-phantom KW - high sensitivity actuator-sensor system KW - neurosurgery KW - phase-locked loop KW - piezoelectric actuators KW - piezoelectric bimorph KW - self-oscillating circuit KW - sensor sensitivity KW - tactile differentiation KW - tactile sensor system KW - transfer function KW - tumor boundary KW - visual differentiation KW - Biomedical measurements KW - Circuits KW - Frequency control KW - Neoplasms KW - Neurosurgery KW - Phase locked loops KW - Piezoelectric actuators KW - Surges KW - Transfer functions KW - Voltage SN - 1075-6787 T2 - Frequency Control Symposium, 2008 IEEE International TI - Development of a biomedical tissue differentiation system using piezoelectric actuators ER -