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Figure 3
Frequency response of the respiratory system to an input signal applied at the airway opening. The response was measured via a pressure sensor at the airway opening (a) and by the novel imaging technique (b). The total power of the frequency responses was calculated by binning the data using a 1/6 octave band (c). As such we can see that there is a consistent pattern between the three different curves and that the lower peak at 2 Hz from (b) is no longer decreased relative to the other frequencies. Imaging measurements were integrated across the entire lung to produce a global measure equivalent to the measurement at the airway opening. All graphs were normalized to the power at the lowest input frequency.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 324-330
doi:10.1107/S1600577515021700
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