title: Waveform generator for electrical impedance tomography (EIT) using linear interpolation with multiplying D/A converters.
abstract: This paper describes the implementation of a multiplying digital-to-analogue (D/A) converter as a programmable waveform generator to be used in an electrical impedance tomography (EIT) system. Different digital techniques of generation waveforms are considered and the advantages and disadvantages of the chosen slope-plus-pedestal technique are presented. A wire-wrapped prototype system has been designed, and from measured frequency spectra the total harmonic distortion can be calculated to values between 1.1 and 2.9% depending on frequency.
authors.affiliation: Radiation Physics Department, University Hospital, Lund, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Blad
authors.forename: J
authors.initials: J
authors.lastname: Johannesson
authors.forename: G
authors.initials: G
authors.lastname: Johnsson
authors.forename: B
authors.initials: B
authors.lastname: Bachman
authors.forename: K
authors.initials: K
authors.lastname: Lindström
mesh_terms: D000703:Analog-Digital Conversion; D017097:Electric Impedance; D004582:Electronics, Medical / Q000295:instrumentation; D004867:Equipment Design; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation; D009991:Oscillometry / Q000295:instrumentation; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D014054:Tomography / Q000295:instrumentation* / Q000379:methods