Attenuation estimation on phantoms--a stability test.
Global and local attenuation coefficient estimates were calculated using three methods: the envelope peak method, the central-frequency-downshift method, and the zero-crossing method. The results show that for each method the error of the local estimate with respect to the global estimate is increased as the sample volume is decreased. While the performances of the latter two methods are comparable, the performance of the envelope peak method is significantly superior.
D006801:Humans; D008961:Models, Structural; D014465:Ultrasonics; D014463:Ultrasonography