アブストラクト(25巻1号:神奈川歯学)

神奈川歯学

Japanese

Title : Computed Electroradiographyの開発静電潜像のデジタル画像化方式の試作
Subtitle : 原著
Authors : 大黒俊樹, 故東與光
Authors(kana) :
Organization : 神奈川歯科大学放射線学教室
Journal : 神奈川歯学
Volume : 25
Number : 1
Page : 1-10
Year/Month : 1990 / 6
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」 現在, 最も臨床に利用されているX線デジタル画像システムはcomputed tomography (CT)とcomputed radiography (CR)である. CTはコンピュータグラフィックスを応用し, 三次元画面構成法により複雑な骨格構造を立体的に観察することを可能にし, 一方, CRは画像処理を駆使することにより, 骨, 軟部組織両者の情報を同時に画像上に描出した. しかしこれらのシステムの解像力はCTで0.5~1.0Lp/mm, CRのoutput画像で2.5Lp/mmと低く, デジタル情報の利点を生かしても, その診断能に限界があった. そしてこれらの装置は, すべての疾患に対して有用でなく, 微細な骨変化の診断や高い精度の定量解析には適さない. 特に, 歯科領域においては骨膜反応や骨梁の乱れ等の微細な骨変化を対象としているために, さらに解像力の高いX線デジタル画像システムが要求される.
Practice : 歯科学
Keywords : X線電子写真法, 静電潜像, デジタル画像化

English

Title : Development of the Computed Electroradiography Trial Manufacture of Digital Imaging System
Subtitle :
Authors : Toshiki OGURO, Tomomitsu Higashi
Authors(kana) :
Organization : Department of Radiology, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 25
Number : 1
Page : 1-10
Year/Month : 1990 / 6
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : [Abstract]: The fundamental element of a latent image on a selenium plate of Electroradiography is a electrical charge. Therefore, the spatial resolution which can be expected from Electroradiography is extremely high. Here, the author developed the Pulse Electron Beam Scanner (PEBS) as the technique to obtain digital pictorial information from the latent image and obtained following results ; 1. We succeeded in converting the latent image into digital signal with high accuracy by using secondary emitted electron through the apparatus that features pulsed electron beam, summing function for secondary emitted electron and plurally arranged detectors and extraction field applied grid. 2. The spatial resolution which we can enjoy to obtain through this apparatus is greater than 500 Lp/mm and the dynamic range at the time when we obtained 500 Lp/mm in terms of the voltage applied to the electrode was +60V to +110V. 3. We succeed in obtaining the digital X ray picture of the bone trabecular structure of human spongy bone with 50 power magnification without using any enlargement picture taking method. The above results indicate that converting the latent image on the selenium plate into digital signal with very high spatial resolution by using PEBS system was achieved. Therefore, we can conclude that we succeeded in obtaining the high spatial resolution digital image from the electororadiographic latent image which has the spatial resolution as high as electrical charge distribution.
Practice : Dentistry
Keywords :