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鈥檚 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 typical hospital X-rays, but the scattered rays are very difficult to separate out. Now a team at the Paul Scherrer Institute in Villigen, Switzerland, has created silicon filters that capture only the scattered light (Nature Materials, ).
