K-edge subtraction images have been produced using a digital video image processor. Images formed by three filtered x-ray beams are detected by an image intensifier-Plumbicon system, digitilized, and combined in real time to produce bone- and tissue-free K-edge subtraction images of iodinated structures. Preliminary studies of rhesus monkey cranial, spinal, and abdominal structures are compared with those of conventional radiography.
The generation of contrast signals through digital mask mode subtraction is studied with an emphasis on the low contrast situations. The effects of beam hardening, radiation scattering, and veiling glare are discussed. The linearity between the contrast signal and the iodine concentration is tested at contrast levels from 3.7 mg /cm3 to 370 mg /coma of iodine in a plastic tube of 2.7 nm in diameter. A xenon perfusion study of a canine brain is presented.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.