アブストラクト(24巻1号:神奈川歯学)

神奈川歯学

Japanese

Title : 骨変化の形態画像診断と機能解析に関する基礎的研究
Subtitle : 原著
Authors : 一之瀬達也, 東与光
Authors(kana) :
Organization : 神奈川歯科大学歯科放射線学教室
Journal : 神奈川歯学
Volume : 24
Number : 1
Page : 139-156
Year/Month : 1989 / 6
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」骨内に生じた実際の骨変化はX線画像上にコントラスト変化と, 形態変化として間接的に描出される. この画像上の変化は主として骨塩の変動によるもので, 従来よりスクリーン系のX線フィルムにおいて40~50%の骨塩の変動が生じた時, 初めて我々はX線像上で, 異常所見として視覚的に認識することができると云われている. しかし, この数字は臨床的経験から推測されたものであって, 実験的に証明されたものではない. また骨変化の視覚的画像評価, 物理的画像評価に関する報告は多いが, そのほとんどは間接的に描出されたX線画像のみを対象に定量評価したもので, 実際の骨塩の変動との関係について検索した報告は少ない. 最近, 三辺はヒト大腿骨ブロックを用いて, 骨梁変化をRMS法(物理的評価法)と検出能評価法(視覚的評価法)を用いて定量評価しているが, 実際の骨塩の変動との関係については検討されていないので, 実験材料に対する客観的, 定量的裏付けが乏しいように思われた.
Practice : 歯科学
Keywords : 骨塩量, Dental Xeroradiography, 検出能, エネルギー強度分布

English

Title : Fundamental Study on Morphological Imaging and Functional Analysis of Change in Bone
Subtitle : Original article
Authors : Tatsuya ICHINOSE, Tomomitsu Higashi
Authors(kana) :
Organization : Department of Oral Radiology, Kanagawa Dental Collcge
Journal : Kanagawa Shigaku
Volume : 24
Number : 1
Page : 139-156
Year/Month : 1989 / 6
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : In this study a comparison was made in determining morphometrical changes in bone utilizing standard dental radiographic technique and dental xeroradiography. In terms of energy intensity, results demonstrated that spectrum analysis is consistent with visual evaluation and useful as a technique for objective evaluation of changes in bone. Changes in trabecular patterns were experimentally reproduced using quantitative determinations of calcium and phosphate. The relation between radiographic changes in bone associated with decalcification and variations in bone mineral content actually eluted from a particular site were examined. Changes in radiographic contrast and morphometry are important as indicators in radiographic interpretation, and their effects on visual evaluation of the radiograms were also studied. Also evaluated was the usefulness of the technique of using a spectrum analyzer to physically analyze the energy intensity distribution changes in bone. The findings in this study indicate that changes in both contrast and morphometry provide indicators for radiographic interpretation in DF, and that changes in contrast play a more dominant role with increasing bone density. It was also demonstrated that radiographic interpretation in DXR depends on morphometrical changes rather than changes in contrast as a major indicator. Since there was no difference in the efficiency of visual detection between DF and DXR, the use of DXR appears more beneficial in view of lower radiation exposure. When the detectability was 80%, actual variations in bone mineral content ranged from 24% to 38%. Thus, it may be possible to visually identify much smaller variations in bone mineral content on radiograms by using additional indicators such as pattern recognition and marginal changes of the lesion.
Practice : Dentistry
Keywords : Dental Xeroradiography