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Fig. 1 | BMC Pulmonary Medicine

Fig. 1

From: The acoustic characteristics of fine crackles predict honeycombing on high-resolution computed tomography

Fig. 1

Definition of fine crackles variables. a Power spectrum. The percentile frequencies F99, F95, and F50 below which 99, 95, and 50% of the total signal power are respectively accumulated were measured. b Time-expanded waveform of crackles. The waveform analysis was used to evaluate the predefined features of fine crackles known as two-cycle duration (2CD), initial deflection width (IDW), largest deflection width (LDW), and amplitude ratios (A2/A1, A3/A1)

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