Hope for portable MRI scanners

时间:2019-03-02 14:20:00166网络整理admin

By Hazel Muir CHEAP, hand-held MRI scanners could one day replace the cumbersome and expensive machines now used in hospitals to create three-dimensional maps of body tissue. The breakthrough is promised by the development of an atomic magnetometer, which can pick up extremely weak magnetic signals. To generate an image, a conventional MRI scanner applies a strong magnetic field that initially aligns the spins of hydrogen nuclei within the body’s water molecules. Zapping the patient with short bursts of radio waves knocks these spins out of alignment,