On the monitoring of pulmonary edema by impedance tomography

Author

Shahidi, A.Vahid ; Guardo, Robert ; Savard, Pierre

Author_Institution

Inst. de Genie Biomed., Ecole Polytech. de Montreal, Que., Canada

fYear

1994

fDate

3-6 Nov 1994

Firstpage

532

Abstract

A realistic human thorax model constructed from serial CT images of a patient is used to evaluate monitoring of pulmonary edema by electrical impedance tomography (EIT). The conductivity, volume and vertical position of an abnormal region in the lungs are gradually varied to simulate the progress of edema. Dynamic EIT images are reconstructed from data computed for the inhomogeneous thorax (heart and lungs) as the reference set and a realistic amount of noise is added to reproduce the conditions in which the technique would be used in practice. Simulation results indicate that a 10 ml change in edema volume is detectable provided that the SNR of the impedance measurements is 40 dB or more

Keywords

electric impedance imaging; image reconstruction; lung; medical image processing; patient monitoring; physiological models; SNR; abnormal region conductivity; abnormal region vertical position; abnormal region volume; dynamic EIT images; edema volume; electrical impedance tomography; heart; image reconstruction; inhomogeneous thorax; lungs; noise; patient; pulmonary edema monitoring; realistic human thorax model; serial CT images; Computational modeling; Computed tomography; Conductivity; Heart; Humans; Image reconstruction; Impedance; Lungs; Patient monitoring; Thorax;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1994. Engineering Advances: New Opportunities for Biomedical Engineers. Proceedings of the 16th Annual International Conference of the IEEE

Conference_Location

Baltimore, MD

Print_ISBN

0-7803-2050-6

Type

conf

DOI

10.1109/IEMBS.1994.411918

Filename

411918