Respirator triggering of electron-beam computed tomography (EBCT): differences in dynamic changes between augmented ventilation and controlled mechanical ventilation

Wolfgang A. Recheis; Axel Kleinsasser; Antonius H. Schuster; Alexander Loeckinger; Thomas Frede; Peter Springer; Christoph Hoermann; Dieter zur Nedden

doi:10.1117/12.383420

20 April 2000 Respirator triggering of electron-beam computed tomography (EBCT): differences in dynamic changes between augmented ventilation and controlled mechanical ventilation

Wolfgang A. Recheis, Axel Kleinsasser, Antonius H. Schuster, Alexander Loeckinger, Thomas Frede, Peter Springer, Christoph Hoermann, Dieter zur Nedden

Author Affiliations +

Proceedings Volume 3978, Medical Imaging 2000: Physiology and Function from Multidimensional Images; (2000) https://doi.org/10.1117/12.383420
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

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.

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Wolfgang A. Recheis, Axel Kleinsasser, Antonius H. Schuster, Alexander Loeckinger, Thomas Frede, Peter Springer, Christoph Hoermann, and Dieter zur Nedden "Respirator triggering of electron-beam computed tomography (EBCT): differences in dynamic changes between augmented ventilation and controlled mechanical ventilation", Proc. SPIE 3978, Medical Imaging 2000: Physiology and Function from Multidimensional Images, (20 April 2000); https://doi.org/10.1117/12.383420

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KEYWORDS

Lung

Visualization

Computed tomography

Image segmentation

Image processing

Tissues

Analog electronics

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