- HOME
- > 一般の方
- > バックナンバー：神奈川歯学
- > 22巻1号
- > アブストラクト
アブストラクト（22巻1号：神奈川歯学）
Japanese
| Title ： | 管電圧が歯科用X線電子写真の画像特性に及ぼす影響 |
|---|---|
| Subtitle ： | 原著 |
| Authors ： | 菊池一好, 東与光 |
| Authors（kana） ： | |
| Organization ： | 神奈川歯科大学放射線学教室 |
| Journal ： | 神奈川歯学 |
| Volume ： | 22 |
| Number ： | 1 |
| Page ： | 142-157 |
| Year/Month ： | 1987 / 6 |
| Article ： | 原著 |
| Publisher ： | 神奈川歯科大学学会 |
| Abstract ： | 「緒言」Xeroradiographyは, 我々が使用している複写機と同じ原理で, X線画像をつくるX線電子写真法である. X線電子写真の医科領域での利用は, 1957年Campbellによって初めて試みられた. しかし, 本格的な臨床利用は1968年Xerox社製Medical 125 Systemが出現してからである. そして, この装置を用いて, Xeroradiographyは, 乳房撮影に広く利用されている. Medical 125 Systemについては, 深見らが多くの臨床および基礎的研究を報告している. また, Medical 125 Systemの頭頸部領域への応用も数多く見られる. 一方, 歯科領域へのX線電子写真の応用は, 1963年Pogorzelska－Stronczakにより報告された. そして, 1977年Grattによってはじめて歯科専用のX線電子写真装置について報告されている. |
| Practice ： | 歯科学 |
| Keywords ： | Dental Xeroradiography, 管電圧特性, Edge contrast, 鮮鋭度, 粒状性 |
English
| Title ： | Influence of Tube Voltage on Image Quality in Dental Xeroradiography |
|---|---|
| Subtitle ： | |
| Authors ： | Kazuyoshi KIKUCHI, Tomomitsu Higashi |
| Authors（kana） ： | |
| Organization ： | Department of Oral Radiology, Kanagawa Dental College |
| Journal ： | Kanagawa Shigaku |
| Volume ： | 22 |
| Number ： | 1 |
| Page ： | 142-157 |
| Year/Month ： | 1987 / 6 |
| Article ： | Original article |
| Publisher ： | Kanagawa Odontological Society |
| Abstract ： | [Abstract]: The edge effect in dental xeroradiography is dependent on the development process, characteristics of the plate, x-ray projection factors and the test object. Among the x-ray projection factors, the influence of tube voltage upon the image quality of dental xeroradiography is especially great. The relationship between the characteristics of image quality of dental xeroradiography (clinical diagnostic value, contrast, sharpness and granularity) and tube voltage was studied. The results were obtained as follows : 1) X-ray photography at low voltage provided an image with edge contrast which was easily visible, while that at high voltage provided an image with weak edge contrast, suggesting a decrease in clinical diagnostic value. 2) The image obtained at higher voltage showed higher sensitivity to broad area contrast, but fog was increased and gamma decreased. 3) The image obtained at high voltage showed higher sensitivity to edge contrast, but the peak-to-peak area was narrow and gamma of the white gap and tangent was decreased. Thus, xeroradiography at high voltage induced an image with edge effect. 4) Resolution was decreased by scattered radiation in the range of 0.5-10 cycle/mm of spatial frequency area, but there was no marked tube-voltage-dependent effect on resolution. 5) There was no tube-voltage-dependent granularity in the range of concentration from 0.5 to 2.0 cycle/mm, but scattered radiation tended to reduce granularity. As described above, xeroradiographic images taken at high voltage showed high sensitivity to broad area contrast and edge contrast, but their diagnostic value decreased because of extensive fog and low edge contrast. Instead, using a relatively low tube voltage results in an image of diagnostically high value with definite edge contrast (one characteristic of image quality of dental xeroradiography). |
| Practice ： | Dentistry |
| Keywords ： | Dental Xeroradiography, Edge contrast |
