Respirator triggering of electron beam computed tomography (EBCT): evaluation of dynamic changes during mechanical expiration in the traumatized patient

Wolfgang A. Recheis; Axel Kleinsasser; Robert Hatschenberger; Rudolf Knapp; Dieter zur Nedden; Christoph Hoermann

doi:10.1117/12.349586

20 May 1999 Respirator triggering of electron beam computed tomography (EBCT): evaluation of dynamic changes during mechanical expiration in the traumatized patient

Wolfgang A. Recheis, Axel Kleinsasser, Robert Hatschenberger, Rudolf Knapp, Dieter zur Nedden, Christoph Hoermann

Author Affiliations +

Proceedings Volume 3660, Medical Imaging 1999: Physiology and Function from Multidimensional Images; (1999) https://doi.org/10.1117/12.349586
Event: Medical Imaging '99, 1999, San Diego, CA, United States

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.

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Wolfgang A. Recheis, Axel Kleinsasser, Robert Hatschenberger, Rudolf Knapp, Dieter zur Nedden, and Christoph Hoermann "Respirator triggering of electron beam computed tomography (EBCT): evaluation of dynamic changes during mechanical expiration in the traumatized patient", Proc. SPIE 3660, Medical Imaging 1999: Physiology and Function from Multidimensional Images, (20 May 1999); https://doi.org/10.1117/12.349586

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KEYWORDS

Lung

Image segmentation

Computed tomography

Tissues

Electron beams

Image analysis

Scanners

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