Effect of radiographic magnification on image contrast of blood vessels.
Blood vessel phantoms 0.5--4 mm in diameter were radiographed with a 0.1 mm x-ray tube with and without scattering medium. The contrast of the blood vessel images was determined by densitometry. Without scattering medium, magnification did not increase the image contrast for 1 mm or larger vessels. With scattering medium, contrast improved significantly due to the reduction of scattered radiation by the air gap between object and film.
D015502:Absorptiometry, Photon; D000792:Angiography; D001921:Brain / Q000098:blood supply; D006801:Humans; D008961:Models, Structural; D011856:Radiographic Image Enhancement; D011858:Radiographic Magnification; D012542:Scattering, Radiation