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Causes of Acoustic Neuroma. What exactly causes acoustic neuroma is unknown. Certain risk factors -- such as age and a family history of neurofibromatosis type 2 -- may make a person more likely to develop this condition. However, people with risk factors do not always get acoustic neuroma, and people without risk factors can get it as well.
Attenuation also results from reflection and scattering of the ultrasound wave. The extent of reflection is determined by the difference in acoustic impedances of the two tissues at the interface (i.e., the degree of impedance mismatch). Acoustic impedance is the resistance of a tissue to the passage of ultrasound.