ACOUSTIC DIAGNOSTIC TECHNIQUE FOR INDIVIDUAL'S PULMONARY FOCAL LESIONS Russian patent published in 2014 - IPC A61B5/08 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to pulmonology, and can be used for the acoustic diagnosis of individual's pulmonary focal lesions. That is ensured by recording respiratory murmurs of the chest surface in classical auscultation areas. Inhalation respiratory murmurs are recorded in the A mode. Their spectra are calculated. The acoustic parameters are measured. Spectral background values are subtracted from the spectral inhalation murmurs. That is followed by determining lower and upper frequencies for the difference spectrum accompanied by an analysed spectrum increase over the background by 10 dB. An upper cut-off frequency of -3 dB is measured by a lower frequency of a 10dB excess of the analysed spectrum over the background. The upper cut-off frequency of -20 dB from the average noise amplitude between the lower frequency of the 10 dB excess of the analysed spectrum over the background and the spectral cut-off frequency of -3 dB. The local pathological areas are diagnosed by comparing the acoustic parameters of the cut-off frequency of -3 dB and -20 dB to the respective threshold values in each analysis point.

EFFECT: technique provides more effective diagnosis of the pulmonary focal lesions and enables intra-roentgen monitoring of the pulmonary focal mass lesions.

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