title: Design and analysis of MEMS based PVDF ultrasonic transducers for vascular imaging.
abstract: Polyvinilidene fluoride (PVDF) single-element transducers for high-frequency (>30 MHz) ultrasound imaging applications have been developed using MEMS (Micro-electro-Mechanical Systems) compatible techniques. Performance of these transducers has been investigated by analyzing the sources and effects of on-chip parasitic capacitances on the insertion-loss of the transducers. Modeling and experimental studies showed that on-chip parasitic capacitances degraded the performance of the transducers and an improved method of fabrication was suggested and new devices were built. New devices developed with minimal parasitic effects were shown to improve the performance significantly. A 1-mm aperture PVDF device developed with minimal parasitic effects has resulted in a reduction of insertion loss of 21 dB compared with devices fabricated using a previous method.
authors.affiliation: Department of BioMedical Engineering, Cleveland Clinic, Cleveland, OH, USA. Chaitanya.Chandrana@sri.utoronto.ca
authors.forename: Chaitanya
authors.initials: C
authors.lastname: Chandrana
authors.forename: James
authors.initials: J
authors.lastname: Talman
authors.forename: Tao
authors.initials: T
authors.lastname: Pan
authors.forename: Shuvo
authors.initials: S
authors.lastname: Roy
authors.forename: Aaron
authors.initials: A
authors.lastname: Fleischman
mesh_terms: D004867:Equipment Design; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D011145:Polyvinyls / Q000737:chemistry*; D014159:Transducers; D018084:Ultrasonography, Interventional / Q000295:instrumentation*; D005465:Fluorocarbon Polymers
chemical_list: D011145:Polyvinyls; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers