Researchers at the Fraunhofer Institute for Biomedical Engineering in Munich, Germany, have built a drug-delivering . The device has a duct that allows saliva into a cavity in the tooth, dissolving the drug, and a sensor to measure the drug’s concentration in the mouth. A wireless handset can periodically correct the dosage by adjusting a valve in the duct, and warns when the drug is running out.
Soft tissue and bone differ more in how they scatter X-rays than in how they absorb them. An X-ray system which used only scattered rays would form a sharper image than…
