A major goal for ultrasonic biophysicists is to determine “dose.” Currently, not even a definition of dose exists for ultrasound. To focus the discussion, let us evaluate an approach for estimating doses in the human gestational sac. The NCRP No. 74 document has summarized in tabular form those studies which have attempted to evaluate the attenuation between the skin (abdominal) and surface and...

in this paper some new applications of empirical mode decomposition (emd) and hilbert spectrum in seismic ground-roll attenuation, random noise attenuation and spectral decomposition are introduced. hilbert spectrum is a time-frequency representation for hilbert-huang transform which is obtained by combination of instantaneous frequency (if) concept and intrinsic mode function of empirical mode...