lung sounds are displayed as a set of waveforms. The inspiration is marked
by a green box and expiration is marked by blue box. This display allows
visual examination of waveforms and time-expanded waveforms as well as
audio playback of the data.
One can also listen to lung or heart sounds on any of the 16 channels
in real time during the recording. Unlimited number of people can listen
simultaneously with via wireless headphones. In our experience it is very
educative to listen to the sounds and view them on the monitor at the
The display of the traces, similar to an EKG, allows direct visual detection
of the abnormalities. Each channel can be examined for crackles, wheezes,
and irregular patterns of inspiration and expiration. Contrast between
abnormal data and data recorded for healthy individuals is pronounced.
The STG uses sophisticated algorithm to identify abnormal lung sounds.
Wheezes and rhonchi are marked by "w" and "r" respectively.
The frequency of the wheeze is specified. Coarse and fine crackles are
marked by "c" and "f" respectively. Initial deflection
width (IDW), number of zero crossings and other crackle specific information
is placed under each crackle.