JaLCDOI 10.18926/11849
タイトル(別表記) Physical Image Quality of Rapid Processing Films
フルテキストURL 003_099_104.pdf
著者 吉田 彰| 本田 貢| 中村 伸枝| 有岡 匡| 小橋 利美| 竹内 知行| 三上 泰隆| 杉田 勝彦| 平木 祥夫|
抄録 The imaging properties of Konica "new" SR series films and "old" MG-SR series films for rapid processing were measured in combination with green-emitting intensifying screens. The measured image quality prarameters include: characteristic curve, modulation transfer function (MTF) and Wiener spectrum. The relative speeds of the new SR series systems were slower than those of the old MG-SR series systems from 10 to 25%. The MTF's of the new systems were generally comparable to those of the old systems, except that SR-G system was improved with an increase of approximately 10%. In the Wiener spectrum measurement, however, the new systems showed from 10 to 35% decrease in low-frequency noise.
キーワード Rapid Processing Films Image Quality Characteristic Curve MTF Wiener Spectrum
出版物タイトル 岡山大学医療技術短期大学部紀要
発行日 1993-01-31
開始ページ 99
終了ページ 104
ISSN 0917-4494
言語 Japanese
論文のバージョン publisher
NAID 120002314046
JaLCDOI 10.18926/11755
タイトル(別表記) New Stepwedge for Bootstrap Sensitometry in Medical Radiography
フルテキストURL 001_019_027.pdf
著者 吉田 彰| 小橋 利美| 大川 義弘| 三上 泰隆| 平木 祥夫| 東 義晴| 山田 俊治| 杉田 勝彦|
抄録 A new stepwedge has been developed for bootstrap sensitometry, which is used for determining the characteristic curve of radiographic screen/film systems. Since each step of the stepwedge is separated by the lead septum, flare generated under one step will not penetrate the region of another step. The metal of the stepwedge can be changed with various materials. Characteristic curves obtained with new stepwedge bootstrap (NSB) and conventional stepwedge bootstrap (CSB) techniques were compared with those obtained for screen/film systems with inverse sqare sensitometry. The inverse square method was used as the reference standard for accuracy. The NSB method provided characteristic curves that agreed well with those obtained using the inverse square method. The slope of the curve in the CSB method was lower than that in the inverse square or NBS method, because of scatter radiation. The shape of the characteristic curve from the NSB method did not vary with the materials of step metals (aluminum and copper). The cumulative error involved when using the bootstrap method is also discussed.
キーワード Stepwedge Bootstrap Characteristic curves Sensitometry Radiographic screen/film systems
出版物タイトル 岡山大学医療技術短期大学部紀要
発行日 1991-03-25
開始ページ 19
終了ページ 27
ISSN 0917-4494
言語 Japanese
論文のバージョン publisher
NAID 120002313394
JaLCDOI 10.18926/11719
タイトル(別表記) Influence on the character of films used for density control of an automatic processor by the difference in the way of preserving
フルテキストURL 010_1_023_028.pdf
著者 大野 誠一郎| 吉田 彰| 井上 龍也| 小橋 利美| 森岡 泰樹| 中桐 義忠|
抄録 自動現像機の濃度管理に用いられるフィルムの保存については,種々の報告がなされており,最良の方法が確立されているとは言い難い。さらに,レギュラフィルムとオルソフィルムの保存方法の違いによる濃度管理への影響,あるいはこれらの比較については,これまでほとんど報告されていない。本論文では,われわれは,レギュラフィルム,フジnew-RXとオルソフィルム,コニカSR-G,SR-VおよびSR-Hを用い,開封後,室温,冷蔵,冷凍の3種類の保存方法を採用した。われわれは,35週間3種類の保存方法で4種類 のフィルムのgross fog,speed indexとaverage gradientへの影響を調査した。その結果レギュラフィルムは,3種類の保存方法による差が認められなかった。オルソフィルムでは,冷蔵・冷凍保存に大きな特性変動が認められた。その原因として,オルソフィルムは増感色素が結露に対して敏感に影響を受けたと考えられた。
抄録(別表記) Though there are various reports on the way of preserving films used for density control of the automatic processor, it is hard to say that the best method isestablished. In addition, the influences on density control or their comparisons by the difference way of preserving film between regular and orthochromatic films have been hardly reported until now. In this paper, three ways of preserving films were employed, which were at a room temperature, in a refrigeration and in a freezer after the films were opened, using a regular film, Fuji new-RX and three orthochromatic films, Konica SR-G, SR-V and SR-H. We investigated the influences on gross fog, speed index and average gradient of four films on three different ways of preserving film for 35 weeks. As a result, new-RX film wasn't influenced by the ways of the preservation. On the other hand, the orthochromatic films were so influences sensitively that the films couldn't be used for density control. It was considered that sensitizing dye stuff got denatured by dew condensation.
キーワード 自動現像機 (automatic processor) 濃度管理 (density control) フィルム保存 (film preservation) 結露 (dew condensation)
出版物タイトル 岡山大学医学部保健学科紀要
発行日 1999-12-20
開始ページ 23
終了ページ 28
ISSN 1345-0948
言語 Japanese
論文のバージョン publisher
NAID 120002313437