Waveform generator for electrical impedance tomography (EIT) using linear interpolation with multiplying D/A converters

B. Blad Radiation Physics Department, University Hospital, S-221 85, Lund, Sweden

J. Johannesson Department of Electrical Measurements, Lund Institute of Technology, S-221 00, Lund, Sweden

G. Johnsson Department of Electrical Measurements, Lund Institute of Technology, S-221 00, Lund, Sweden

B. Bachman Radiation Physics Department, University Hospital, S-221 85, Lund, Sweden

K. Lindstrom Department of Electrical Measurements, Lund Institute of Technology, S-221 00, Lund, Sweden

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.

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Waveform generator for electrical impedance tomography (EIT) using linear interpolation with multiplying D/A converters

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Waveform generator for electrical impedance tomography (EIT) using linear interpolation with multiplying D/A converters

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