Results obtained in a viscoelastic phantom indicate that the measured attenuation is independent of the observation window and agree with measurements of c and α obtained using the previously described progressive phase and exponential decay analysis.
We use this construct, as opposed to the linear attenuation coefficient, because generally the absolute value of the measured attenuation coefficient cannot be relied upon.
Techniques used for measuring attenuation include cutback technique and Rayleigh backscattering.
It turns out that the predicted attenuations are always optimistic when compared with the measured attenuation while the numerical response functions and the primary field correspond quite well to those measured.
The attenuation coefficients calculated using accurate optical properties were generally matched with the light transmission characteristics, and were in good agreement (6% on average) with the measured attenuation coefficients for both healthy and rotten onions at 700, 728 and 804 nm.
Measured attenuation exceedance time percentages are larger than predicted for higher attenuation values.
Table 4 Measured attenuation introduced by the haul of the aircraft.
Probability distributions obtained from measured attenuation and distributions calculated using different models were compared.
The model is based on the measured attenuation map of the patient.
