title: Scanning head with 128-element 20-MHz PVDF linear array transducer.
abstract: A scanning head has been designed and fabricated that incorporates a 20-MHz, 128-element linear transducer. The scanning head also incorporates -200 V pulsers and a custom 16-channel amplifier. The transducer was constructed with 28 microm PVDF film with an element pitch of 250 microm. The transducer showed an average -20 dB pulse length of 69 ns. The elements of the PVDF array were tested and found to have 7.5 mPa/ radical Hz equivalent noise pressure. The radiated power level for 32 pulsed elements was approximately 1 MPa. An imaging test shows that the system achieves axial and lateral resolutions of 40 microm and 0.2 mm, respectively. The entire scanning head dissipates approximately 1.6 W at a pulse repetition rate of 750 Hz.
authors.affiliation: University of Manchester, Department of Electrical and Electronic Engineering, Manchester, UK. s.carey@manchester.ac.uk
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Carey
authors.forename: Christian
authors.initials: C
authors.lastname: Brox-Nilsen
authors.forename: Hugh M
authors.initials: HM
authors.lastname: Lewis
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Gregory
authors.forename: John V
authors.initials: JV
authors.lastname: Hatfield
mesh_terms: D000465:Algorithms; D000669:Amplifiers, Electronic; D001132:Arm / Q000098:blood supply / Q000000981:diagnostic imaging; D004867:Equipment Design; D006801:Humans; D008962:Models, Theoretical; D011145:Polyvinyls / Q000737:chemistry*; D012867:Skin / Q000000981:diagnostic imaging; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation*; D005465:Fluorocarbon Polymers
chemical_list: D011145:Polyvinyls; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers