| http://www.w3.org/ns/prov#value | - f a predetermined area; 2) optionally inducing the release of a drug from the drug delivery system by irradiating the system with electromagnetic and/or mechanical vibrations; and 3) imaging ultrasonically an area including the predetermined area so that an image of the predetermined area is obtained and, when a drug is released, the rate of the release can be determined as function of space and t
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