About: http://webisa.webdatacommons.org/419041544

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	Attenuation maps can be obtained using modalities such as CT scans, or they can be estimated from transmission data, using external sources coupled with an appropriate collimation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com