About: http://webisa.webdatacommons.org/364327062

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Wave frequency, such as sound, varies with direction and speed, allowing accurate measurement of blood flow velocity and any changes that have occurred, since changes indicate the presence of vascular disease.
http://www.w3.org/ns/prov#wasQuotedFrom	uthscsa.edu