Medical Imaging -- Using RF, Ultrasonic, Nuclear and Even Holography
Nuclear Medicine Imaging also called Positron Emission Tomography (PET) measures radioactive substances (injected into the subject) such as Carbon-11. PET systems use a circular shaped gamma ray detector to measure the radioactive elements, converting the gamma rays into photons. A photomultiplier tube converts the photons into electrical signals.
A number of emerging technologies are coming into play for medical imaging applications. Bio-holography or what is also called Beo-tomography places minor body parts such as the human finger into an electromagnetic field to generate holographic images of internal organs. While still in the research phase, they have tested over 8000 patients.
RF Current Density Imaging is an MRI technique that uses electromagnetic waves to measure magnitude and phase from which one can create an image of the subject.
Harris Technologies developed a technique called hyper radar (requires subscription) for medical imaging.
These emerging technologies seek to produce finer images at a lower cost by making better use of RF waves.