Adult patients who require monitored anesthesia for PET scanning due to claustrophobia Adult patients who require monitored anesthesia for PET scanning Adult patients who require monitored anesthesia for PET scanning Adult patients who require monitored anesthesia for MRI scanning Adult patients who require monitored anesthesia for PET scanning or MRI imaging Adult patients who require monitored anesthesia for PET scanning Adult patients who require monitored anesthesia for PET scanning Adult patients who require monitored anesthesia for MRI scanning Adult patients who require monitored anesthesia for magnetic resonance imaging (MRI) scanning Adult patients who require monitored anesthesia for PET scanning Subjects who require monitored anesthesia for MRI scanning Adult patients who require monitored anesthesia for PET scanning