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Proceedings Paper

Respirator triggering of electron-beam computed tomography (EBCT): differences in dynamic changes between augmented ventilation and controlled mechanical ventilation
Author(s): Wolfgang A. Recheis; Axel Kleinsasser; Antonius H. Schuster; Alexander Loeckinger; Thomas Frede; Peter Springer; Christoph Hoermann; Dieter zur Nedden
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Paper Abstract

The purpose was to evaluate differences in dynamic changes of the lung aeration (air-tissue ratio) between augmented modes of ventilation (AMV) and controlled mechanical ventilation (CMV) in normal subjects. 4 volunteers, ventilated with the different respirator protocols via face mask, were scanned using the EBCT in the 50 ms mode. A software analyzed the respirator's digitized pressure and volume signals of two subsequent ventilation phases. Using these values it was possible to calculate the onset of inspiration or expiration of the next respiratory phase. The calculated starting point was then used to trigger the EBCT. The dynamic changes of air- tissue ratios were evaluated in three separate regions: a ventral, an intermediate and a dorsal area. AMV results in increase of air-tissue ratio in the dorsal lung area due to the active contraction of the diaphragm, whereas CMV results in a more pronounced increase in air-tissue ratio of the ventral lung area. This study gives further insight into the dynamic changes of the lung's biomechanics by comparing augmented ventilation and controlled mechanical ventilation in the healthy proband.

Paper Details

Date Published: 20 April 2000
PDF: 11 pages
Proc. SPIE 3978, Medical Imaging 2000: Physiology and Function from Multidimensional Images, (20 April 2000); doi: 10.1117/12.383420
Show Author Affiliations
Wolfgang A. Recheis, Univ. Hospital Innsbruck (Austria)
Axel Kleinsasser, Univ. Hospital Innsbruck (Austria)
Antonius H. Schuster, Univ. Hospital Innsbruck (Austria)
Alexander Loeckinger, Univ. Hospital Innsbruck (Austria)
Thomas Frede, Univ. Hospital Innsbruck (Austria)
Peter Springer, Univ. Hospital Innsbruck (Austria)
Christoph Hoermann, Univ. Hospital Innsbruck (Austria)
Dieter zur Nedden, Univ. Hospital Innsbruck (Austria)

Published in SPIE Proceedings Vol. 3978:
Medical Imaging 2000: Physiology and Function from Multidimensional Images
Chin-Tu Chen; Anne V. Clough, Editor(s)

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