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Proceedings Paper

Respirator triggering of electron beam computed tomography (EBCT): evaluation of dynamic changes during mechanical expiration in the traumatized patient
Author(s): Wolfgang A. Recheis; Axel Kleinsasser; Robert Hatschenberger; Rudolf Knapp; Dieter zur Nedden; Christoph Hoermann
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Paper Abstract

The purpose of this project is to evaluate the dynamic changes during expiration at different levels of positive end- expiratory pressure (PEEP) in the ventilated patient. We wanted to discriminate between normal lung function and acute respiratory distress syndrome (ARDS). After approval by the local Ethic Committee we studied two ventilated patients: (1) with normal lung function; (2) ARDS). We used the 50 ms scan mode of the EBCT. The beam was positioned 1 cm above the diaphragm. The table position remained unchanged. An electronic trigger was developed, that utilizes the respirators synchronizing signal to start the EBCT at the onset of expiration. During controlled mechanical expiration at two levels of PEEP (0 and 15 cm H2O), pulmonary aeration was rated as: well-aerated (-900HU/-500HU), poorly- aerated (-500HU/-100HU) and non-aerated (-100HU/+100HU). Pathological and normal lung function showed different dynamic changes (FIG.4-12). The different PEEP levels resulted in a significant change of pulmonary aeration in the same patient. Although we studied only a very limited number of patients, respirator triggered EBCT may be accurate in discriminating pathological changes due to the abnormal lung function in the mechanically ventilated patient.

Paper Details

Date Published: 20 May 1999
PDF: 10 pages
Proc. SPIE 3660, Medical Imaging 1999: Physiology and Function from Multidimensional Images, (20 May 1999); doi: 10.1117/12.349586
Show Author Affiliations
Wolfgang A. Recheis, Univ. Hospital Innsbruck (Austria)
Axel Kleinsasser, Univ. Hospital Innsbruck (Austria)
Robert Hatschenberger, Univ. Hospital Innsbruck (Austria)
Rudolf Knapp, Univ. Hospital Innsbruck (Austria)
Dieter zur Nedden, Univ. Hospital Innsbruck (Austria)
Christoph Hoermann, Univ. Hospital Innsbruck (Austria)

Published in SPIE Proceedings Vol. 3660:
Medical Imaging 1999: Physiology and Function from Multidimensional Images
Chin-Tu Chen; Anne V. Clough, Editor(s)

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