| http://www.w3.org/ns/prov#value | - Accordingly, when ventilation scans are deemed desirable, radioactive gases such as xenon and krypton are generally relied upon notwithstanding the relatively high cost entailed in producing the gas, patient inconvenience, extremely limited time in whichto obtain even one image of the lung and the need for containment and disposition of the exhaled gas.This invention overcomes the problems heretof
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