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Concept of theranostics. (A) A pathological process localized to the brain. (B) Systemic administration of a therapeutic agent distributes the theranostic throughout the entire body. (C) Nanotechnology enables concentration of the agent in the targeted area. (D) Inclusion of imaging probes within the agent enables monitoring of the process in vivo. (E) By focusing the action of the therapeutic agent in the targeted area, the treatment becomes more effective.
