Ultrasonic Beam Sensitivity Profile Changes in Mammalian Tissue

摘要: When an ultrasonic beam passes through tissue, it undergoes a complex series of interactions with the medium. These serve to attenuate, scatter and oftentimes refract from its initial path. Attenuating regions scattering sites or interfaces are usually not distributed uniformly throughout for that matter, may be intercepted same degree by all sections beam. Scatter beam, both diffuse specular, as well local nonuniformities in attenuation refractive index volume could result ultrasound profile quite different predicted using only frequency, diameter, focal properties transducer itself. The present study was undertaken investigate changes such sensitivity profiles brought about transmission reflection normal abnormal mammalian tissue variety clinically-used transducers.