1. Technegas® ventilation single photon emission computed tomography images of an asthmatic subject (axial slices) at a) baseline and b) post-methacholine after 20% fall in forced expiratory volume in 1 s.
Technegas® ventilation single photon emission computed tomography images of an asthmatic subject (axial slices) at a) baseline and b) post-methacholine after 20% fall in forced expiratory volume in 1 s. The graphs below are the correspondence frequency distributions of Technegas® intensity, which are estimates of relative ventilation. The colour bar between images a) and b) indicates Technegas® activity, with red being highest and purple being the lowest. The pattern of ventilation clearly changes, post-bronchoconstriction with ventilation moving ventrally in both lungs. A number of statistical indices could be derived from the frequency distribution, as part of future research in characterising patterns of ventilation and their change with interventions.
Gregory G. King et al. Eur Respir Rev 2019;28:180111
©2019 by European Respiratory Society