title: Monochromatic polycapillary imaging utilizing a computed radiography system.
abstract: A fundamental study on quasi-parallel radiography using a polycapillary plate and a copper-target x-ray tube is described. In the experiments, the tube voltage was regulated from 12 to 22 kV, and the tube current was regulated within 3.0 mA by the filament temperature. The exposure time was controlled in order to obtain optimum x-ray intensity, and the maximum focal spot dimensions were approximately 2.0 x 1.5 mm. The thickness and the inner capillary tube diameter of the polycapillary were 1.0 mm and 25 microm, respectively. Monochromatic x-rays were produced using a 10 microm-thick nickel filter with a tube voltage of 17 kV, and these rays were formed into quasi-parallel beams by the polycapillary. The radiogram was taken using a computed radiography system utilizing imaging plates. In the measurement of image resolution, the spatial resolution hardly varied according to increases in the distance between the resolution-test chart and imaging plate using a polycapillary. A 50 microm tungsten wire could be observed, and fine blood vessels of approximately 100 microm were visible in angiography.
authors.affiliation: Department of Physics, Iwate Medical University, 3-16-1, Honcho-dohri, Morioka-shi, Iwate-pref. 020-0015, Jap. msagae@iwate-med.ac.jp
authors.forename: Michiaki
authors.initials: M
authors.lastname: Sagae
authors.forename: Eiichi
authors.initials: E
authors.lastname: Sato
authors.forename: Yasuomi
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Etsuro
authors.initials: E
authors.lastname: Tanaka
authors.forename: Hideo
authors.initials: H
authors.lastname: Mori
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Kawai
authors.forename: Haruo
authors.initials: H
authors.lastname: Obara
authors.forename: Toshio
authors.initials: T
authors.lastname: Ichimaru
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Takayama
authors.forename: Hideaki
authors.initials: H
authors.lastname: Ido
mesh_terms: D000792:Angiography; D005471:Fluoroscopy; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement; D014414:Tungsten; D014965:X-Rays
chemical_list: D014414:Tungsten