Author Honda, Mitsugi|
Published Date 2010-03-25
Publication Title
Content Type Thesis or Dissertation
JaLCDOI 10.18926/15261
Title Alternative 現像温度および時間のマンモフイルム特性に与える影響
FullText URL 008_2_121_129.pdf
Author Maruyama, Toshinori| Goto, Sachiko| Azuma, Yoshiharu| Nakagiri, Yoshitada| Shibuya, Koichi| Sugita, Katsuhiko| Takeuchi, Tomoyuki| Honda, Mitsugi| Yoshida, Akira|
Abstract The influence for developing temperature and processing time within film processing conditions was investigated using four mammographic films, Konica New CM, Fuji UM-MA HC, Kodak Min-R M and Kodak EB/RA (for rapid system). And Fuji UR-2, a double-emulsion film, was used as a control. Those sensitometric strips exposed by a sensitometer were processed in the different combinations of developing temperatures ranging from 28 to 36℃, processing times from 45 to 210 sec. Average gradient, relative speed and base plus fog obtained from the measured film characteristic curves were evaluated for the different developing temperatures and times. Fuji UR-2 was scarcely affected and mammographic films were greatly affected in the different combinations without an increase in base plus fog except EB/RA. In New CM, UM-MA HC and Min-R M, the average gradients and the relative speeds increased as the developing temperature was higher and the developing time was longer, but the increases were limit on the combination of 36℃ and 210 sec in New CM and UM-MA HC. In EB/RA, the average gradients were almost constant and the relative speeds increased slightly like the double-emulsion film. These results suggested that it would be possible to contribute to dose reduction and advancement of contrast in New CM, UM-MA HC and Min-R M by changing these processing parameters.
Abstract Alternative フィルム処理条件において,現像温度と処理時間に対する影響を4種類のマンモグラフィ用フィルムKonica New CM, Fuji UM-MA HC,Kodak Min-R M,迅速処理用Kodak EB/RAについて調べた。そして,比較基準用として両面乳剤フィルムFuji UR-2を用いた。感光計で露光したフィルムを現像温度28~36℃,処理時間45~210秒で処理した。特性曲線から得られたフィルム特性(平均階調度,相対感度,カブリ濃度)を異なる現像温度,現像時間に対して評価した。UR-2はほとんど影響を受けず,マンモグラフィ用フィルムは,カブリ濃度が上昇することなく,現像条件の影響を大きく受けた。New CM, UM-MA HC,Min-R Mは現像温度の上昇,処理時間の延長に伴い,平均階調度と相対感度は増加した。しかし,New CM, UM-MA HCの36℃,210秒で増加は限度に達した。EB/RAの平均階調度は一定で,相対感度は両面乳剤フイルムと同 様にわずかな増加であった。これらの結果は,New CM, UM-MA HC, Min-R Mにおいて,処理条件を変化させることにより,被曝低減,コントラスト向上に貢献できる可能性を示唆していた。
Keywords マンモグラフィ (Mammography) 現像処理パラメータ (Processing Parameter) 特性曲線 (Characteristic Curve) 平均階調度 (Average Gradient) 相対感度 (Relative Speed)
Publication Title 岡山大学医療技術短期大学部紀要
Published Date 1998-01-31
Volume volume8
Issue issue2
Start Page 121
End Page 129
ISSN 0917-4494
language 英語
File Version publisher
NAID 120002307943
JaLCDOI 10.18926/11934
Title Alternative Granularity of Asymmetric Screen-Film System
FullText URL 005_105_110.pdf
Author Honda, Mitsugi| Yoshida, Akira| Nakamura, Nobue| Mimura, Seiichi| Kadohisa, Sigefumi| Mikami, Yasutaka| Azuma, Yoshiharu| Takeuchi, Tomoyuki| Sugita, Katsuhiko| Hiraki, Yoshio|
Abstract 非対称増感紙フィルム系について、両面乳剤フィルムのウィナースペクトル測定に及ぼす影響を検討した。濃度0.5~2.5のノイズ試料のフロント乳剤、バック乳剤、支持体層それぞれで測定したスペクトルの和と、両面同時に測定した全スペクトルとを比較した。その結果、全ウィナースペクトルの値は、フロント乳剤、バック乳剤の和より高くなった。また、試料濃度が高いほど、その差は大きくなった。これらは、マイクロデンシトメータの光学系の配置と両面乳剤フィルムの構造に起因している。したがって、非対称システムのようにフィルムの前面と後面で特性を分けて考える場合、注意を要する。
Abstract Alternative We have examined a factor affecting the Wiener spectrum measurement of double-emulsion film. An asymmetric screen-film system (Kodak HC/INSIGHT system) was used in this study. The results indicated that the total Wiener spectra of double-emulsion films are higher than the sum of spectra obtained with the front emulsion and back emulsion separately. These differences are attributed to the arrangement of the optical system of the microdensitometer used to measure and the structure of double-emulsion film.
Keywords 非対称増感紙フィルム系 (asymmetric screen-film system) 両面乳剤フィルム (double-emulsion film) ウィナースペクトル (Wiener spectrum) 粒状性 (granularity) マイクロデンシトメータ (microdensitometer)
Publication Title 岡山大学医療技術短期大学部紀要
Published Date 1995-01-31
Volume volume5
Start Page 105
End Page 110
ISSN 0917-4494
language 日本語
File Version publisher
NAID 120002313805
JaLCDOI 10.18926/11849
Title Alternative Physical Image Quality of Rapid Processing Films
FullText URL 003_099_104.pdf
Author Yoshida, Akira| Honda, Mitsugi| Nakamura, Nobue| Arioka, Tadashi| Kobashi, Toshimi| Takeuchi, Tomoyuki| Mikami, Yasutaka| Sugita, Katsuhiko| Hiraki, Yoshio|
Abstract 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.
Keywords Rapid Processing Films Image Quality Characteristic Curve MTF Wiener Spectrum
Publication Title 岡山大学医療技術短期大学部紀要
Published Date 1993-01-31
Volume volume3
Start Page 99
End Page 104
ISSN 0917-4494
language 日本語
File Version publisher
NAID 120002314046
JaLCDOI 10.18926/11733
Title Alternative Physical Properties of Screen-Film Systems - New System for Chest Radiography -
FullText URL 006_007_013.pdf
Author Goto, Sachiko| Yoshida, Akira| Nakamura, Nobue| Maruyama, Toshinori| Azuma, Yoshiharu| Shibuya, Koichi| Nakagiri, Yoshitada| Sugita, Katsuhiko| Honda, Mitsugi|
Abstract 胸部専用の新しい増感紙/フィルムシステムについて物理的画質特性を測定し、従来のシステムと比較を行った。測定した新システムは、日本コダックのインサイトシステムからHC/IT-1、富士メディカルシステムのADシステムからHG-M/UR-1、コニカのEXシステムからXG-S/ES-C である。従来のシステムとして富士メディカルシステムのHR-4/Super HR-S を使用した。その結果、新システムは22~73%感度は高く、特性曲線においては低濃度部を持ち上げ、最大コントラストは高濃度側にシフトしていた。空間周波数2cycles/mmで相対鮮鋭度を比較すると、新システムが10~30%程度の低下となっていた。ノイズは、濃度1.0で新システムが35~46%の減少となった。以上より、新システムは、縦隔部の濃度を上げ、粒状性の改善を重視した設計となっていることが分かった。
Abstract Alternative The new three screen-film systems, Kodack INSIGHT system HC/IT-1, Fuji AD system HG-M/UR-1, and Konica EX system XG-S/ES-C for chest radiography were evaluated. In addition, the conventional system Fuji HR-4/Super HR-S was measured for comparison with new systems. The evaluation method is as follows. The image quality characteristics, speed, contrast, resolution and granularity were measured. The sensitivity and contrast were determined by measuring the MTF (modulation transfer function) and NCTF (normalized contrast transfer function). The granularity was estimated by measuring the Wiener spectrum. The speed of the new systems were improved by 22% to 73%. The dinsities at the maximum gradient value were shifted to high density (2.0-2.7). However, they had 10% to 30% less resolution. The other hand, the granularities were improved by 21% to 37% at 1.0 density. These results suggested that the emphasis of new systems was put on improving the image quality of mediastinum region, maintaining performance of the conventional system.
Keywords 増感紙フィルム系 (screen-film system) 物理特性 (physical properties) 感度 (speed (film sensitivity)) コントラスト (contrast) 鮮鋭度 (resolution) 粒状性 (granularity)
Publication Title 岡山大学医療技術短期大学部紀要
Published Date 1996-02-29
Volume volume6
Start Page 7
End Page 13
ISSN 0917-4494
language 日本語
File Version publisher
NAID 120002313511