Detection and quantification of intraperitoneal fluid using electrical impedance tomography

Rosalind J. Sadleir, Richard A. Fox

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

A prototype electrical impedance tomography system was evaluated prior to its use for the detection of intraperitoneal bleeding, with the assistance of patients undergoing continuous ambulatory peritoneal dialysis (CAPD). The system was sensitive enough to detect small amounts of dialysis fluid appearing in subtractive images over short time periods. Uniform sensitivity to blood appearing anywhere within the abdominal cavity was produced using a post-reconstructive filter that corrected for changes in apparent resistivity of anomalies with their radial position. The image parameter used as an indication of fluid quantity, the resistivity index, varied approximately linearly with the quantity of fluid added. A test of the system's response to the introduction of conductive fluid out of the electrode plane (when a blood-equivalent fluid was added to the stomach) found that the sensitivity of the system was about half that observed in the electrode plane. Breathing artifacts were found to upset quantitative monitoring of intraperitoneal bleeding, but only on time scales short compared with the fluid administration rate. Longer term breathing changes, such as those due to variations in the functional residual capacity of the lungs, should ultimately limit the sensitivity over long time periods.

Original languageEnglish (US)
Pages (from-to)484-491
Number of pages8
JournalIEEE Transactions on Biomedical Engineering
Volume48
Issue number4
DOIs
StatePublished - Apr 23 2001
Externally publishedYes

Keywords

  • Electrical impedance tomography
  • Intraperitoneal bleeding
  • Quantification

ASJC Scopus subject areas

  • Biomedical Engineering

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