result 481 件
| JaLCDOI | 10.18926/11828 |
|---|---|
| Title Alternative | Measurement of Fe(2+)-induced Lipid Peroxidation of Mitochondria used Thiobarbituric Acid Method under the Acetic Acid Conditions |
| FullText URL | 003_043_047.pdf |
| Author | Yamamoto, Goki| |
| Abstract | Mitochondrial lipid peroxidations were usually detected by the thiobarbituric acid (TBA) color reaction under the acidic conditions with hydrochloric and trichloroacetic acids. The time response curve of Fe(2+)-induced lipid peroxidation, accompanied the lag time of induction period, of mouse liver mitochondria was measured with detection of the produced lipid peroxides by the TBA method under the acidic conditions with acetic acid. Fe(2+)-induced lipid peroxidation was terminated by the addition of ethylenediaminetetraacetate (EDTA). The lag time of the peroxidation detected by TBA method in the acetic acid conditions was obtained as well as that detected in the hydrochloric and trichloroacetic acids conditions. The fact indicates that Fe(2+)-induced lipid peroxidation of mitochondria and its lipid peroxides are able to be measured by the TBA color reaction in the acetic acid conditions with EDTA. |
| Keywords | Mitochondrial Lipid Peroxidation Thiobarbituric Acid Ferrous Ion |
| 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 | 43 |
| End Page | 47 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313733 |
| JaLCDOI | 10.18926/11820 |
|---|---|
| Title Alternative | Photon background caused by the reduction of the electron beam energy - Materials of scattering foil - |
| FullText URL | 003_013_018.pdf |
| Author | Nakagiri, Yoshitada| Mimura, Seiiti| Inamura, Keiji| Tahara, Seiji| Miyake, Hideaki| Azuma, Yoshiharu| Egusa, Tomomi| Mikami, Yasutaka| Hiraki, Yoshio| Yamada, Toshiharu| Sugita, Katsuhiko| |
| Abstract | The total skin electron beam therapy has been one of the clinical treatment for peripherally T-cell lymphoma; Mycosis fungoides, adult T-cell lymphoma, and so on. The crucial points in this treatment are not only having an optimum energy level of electron beam for a target volume (a tissue) but also keeping the photon back ground low. It is not easy to regulate those points by the control panel, however, for the equipment that is conventinally used for electron beam, theoretically, is to exchange lead (Pb), which is ordinarily used, to a low atomic number material as a scattering foil. We examined several different kinds and / or various thickness as a scattering foil material that can make the electron beam lower without an increase of the contaminant as X-ray. We hereby reported the results, and strongly suggested the following two materials in use; acrylic plate, carbon board, and so on, which are easily available and worked, would be practically useful for the total skin electron beam therapy. |
| Keywords | 電子線エネルギー X線混入率 電子線全身照射法 スキャタリングホイル |
| 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 | 13 |
| End Page | 18 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313375 |
| JaLCDOI | 10.18926/11808 |
|---|---|
| Title Alternative | RESOLUTION PROPERTIES OF CRT MONITORS |
| FullText URL | 002_081_088.pdf |
| Author | Takeuchi, Tomoyuki| Yoshida, Akira| Azuma, Yoshiharu| Sugita, Katsuhiko| Nakamura, Nobue| Kishi, Kanji| Hiraki, Yoshio| |
| Abstract | We have developed a new technique for measuring the modulation transfer function (MTF) of a cathode ray tube (CRT) monitor. The "nominal" MTF was measured by displaying a line image of a width of one pixel on the CRT monitor using the pattern generator. We also measured the effective pixel width. In order to obtain the "actual" MTF, the nominal MTF was divided by the sinc function which is the Fourier transform of the effective pixel width. The results indicate that the corrected MTF converges to the constant value as the effective pixel width is narrower. Thus, the actual MTFs were determined and compared in the horizontal direction for two CRT monitors. |
| Keywords | CRT Monitor Resolution Effective Pixel Width Modulation Transfer Function (MTF) |
| Publication Title | 岡山大学医療技術短期大学部紀要 |
| Published Date | 1992-02-05 |
| Volume | volume2 |
| Start Page | 81 |
| End Page | 88 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313719 |
| JaLCDOI | 10.18926/11805 |
|---|---|
| Title Alternative | Dose Distributions at Standard Diagnostic X-Ray Energy |
| FullText URL | 002_063_071.pdf |
| Author | Miyake, Hideaki| Inamura, Keiji| Nakagiri, Yoshitada| Kadohisa, Shigefumi| Mikami, Yasutaka| Azuma, Yoshiharu| Yamada, Toshiharu| Sugita, Katsuhiko| Hiraki, Yoshio| |
| Abstract | Exposure dose has been indicated by surface dose or transit dose, but they could not indicate dose distributions inside the body. Modulex as the radiation therapy planning system was used for dose distributions at standard diagnostic X-ray energy. X-ray is low energy X-ray at standard diagnostic radiography, so alterations of the energy and the scattering dose distribution by absorbers are quite different from those at high energy X-rays. Mix-DP was put to the homogeneous tissue use, then Bone equivalent phantom or Lung equivalent phanton was put to the inhomogeneous tissue use. Density correction factors for inhomogeneous phantoms were gotten by the calculation of the water equivalent thickness. In Bone the inhomogeneous correction depended strongly on the bone thickness. In Lung it was in need of one density correction factor and the scattering correction method for the decrease of the back scattering. The calculated dose distributions by Modulex agreed with measured data when each correction was carried out, and it was indicated that those data apply to inclinical situations. |
| Keywords | Exposure Dose Dose Distribution Radiation Therapy Planning System Density Correction Scattering Correction |
| Publication Title | 岡山大学医療技術短期大学部紀要 |
| Published Date | 1992-02-05 |
| Volume | volume2 |
| Start Page | 63 |
| End Page | 71 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313328 |
| JaLCDOI | 10.18926/11801 |
|---|---|
| Title Alternative | Measurement of Serum Lipid Peroxides used Thiobarbituric Acid Method: Colorimetric and Fluorometric Assays and Effect of Ferrous Ion |
| FullText URL | 002_051_061.pdf |
| Author | Yamamoto, Goki| |
| Abstract | Serum lipid peroxides were measured by a thiobarbituric acid (TBA) method. TBA color reactions carried out under the conditions with acetic acid (TBA-AA) or hydrochloric acid (TBA-HCl) systems, and then TBA value was detected by colorimetric ([OD]) and fluorometric ([FR]) measurements. Effects of ferrous ion, ferric ion and EDTA on the both systems were examined. Equal TBA value dependent upon concentrations of MDA (tetraethoxypropane) were obtained on both systems detected by [OD], but the relative fluorescence of TBA-AA system was higher than that of TBA-HCl system. Fluorometric determination was suitable for low TBA value, and colorimetric one was for high TBA value. Good correlation between TBA[OD] values and TBA[FR] values of serum from patients was estimated, but it was suggested that effects of serum substance were differ on the both systems. Effects of iron on TBA-AA and TBA-HCl systems were different significantly, particularly high Fe-TBA values obtained from TBA-AA system in the presence of ferrous ion. The fact suggests that serum lipid peroxidation is induced by ferrous ion during a heating of TBA color reaction. Same effect of ferric ion in TBA-AA system was observed. The increment of TBA values by ferrous and ferric ions was inhibited by a addition of EDTA. It was considered that the difference effect of iron on the both systems was due to pH and acetic acid concentration. The relationship of TBA values and Fe-TBA values of serum from patients was no correlated, and the various inhibition ratios of EDTA for the TBA value was calculated. It is suggested that Fe-TBA value is possible to detemine the qualitative difference of serum lipid peroxides. |
| Keywords | Serum Lipid Peroxides Thiobarbituric Acid Ferrous Ion |
| Publication Title | 岡山大学医療技術短期大学部紀要 |
| Published Date | 1992-02-05 |
| Volume | volume2 |
| Start Page | 51 |
| End Page | 61 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313802 |
| JaLCDOI | 10.18926/11766 |
|---|---|
| Title Alternative | Basic properies of beam flatness analyzer (THEBES 7000) |
| FullText URL | 007_1_023_027.pdf |
| Author | Nakagiri, Yoshitada| Oguri, Nobuhiro| Maruyama, Toshinori| Okawa, Yoshihiro| Wakasa, Hiroyuki| Nagaya, Isao| Azuma, Yoshiharu| Shibuya, Koichi| Goto, Sachiko| Mikami, Yasutaka| Inamura, Keiji| Morioka, Yasuki| Sugita, Katsuhiko| Hiraki, Yoshio| |
| Abstract | 癌の有力な治療法の1つである放射線治療はシステム全体の許容誤差が±5％と、正確な治療が要求されている。正確な線量を正確な場所に照射されなければならない。そのためには日頃から照射装置のQuality Control が重要である。Beam平坦度の測定はその中でも、重要な項目で1／6月の測定頻度が勧告されている。今回、市販のBeam Flatness Analyzer (7000型 THEBES) を使用する機会を得たので、その基礎的性能であるChamber 相互の感度のちがい、測定値の再現性、識別可能な最小線量について実験を行った。各項目とも誤差が非常に少なく、日常の使用に際してそのデータは十分信頼できるものであることがわかった。 |
| Keywords | 放射線治療 (radiation therapy) ビーム平坦度 (beam flatness) 性能評価 (valuation of property) 電子加速器 (electron accelerator) |
| Publication Title | 岡山大学医療技術短期大学部紀要 |
| Published Date | 1996-09-30 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 23 |
| End Page | 27 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313499 |
| JaLCDOI | 10.18926/11757 |
|---|---|
| Title Alternative | Lipid Peroxides (TBA reactive substances)and Fatty Acid Compositions in Mouse Serum with Whole-body Irradiation and in Tumor-bearing Mouse Serum with Local Irradiation |
| FullText URL | 001_029_037.pdf |
| Author | Yamamoto, Goki| |
| Abstract | Effects of irradiation on lipid peroxides of mouse serum, Ehrlich solid tumor-bearing mouse serum, which tomor cells were transplanted to the leg, and its tumor tissue were studied by a thiobarbituric acid (TBA) color reaction in the acetic acid condition with (Fe-TBA value) or without (TBA value) ferrous ammonium sulfate. TBA reactive substances were caluculated into the amount of malondialdehyde. Besides, fatty acid and lipid compositions were analyzed as a substrates. Irradiated samples were isolated at 3 days after irradiations. The TBA value of normal mouse serum was expressed 17nmoles/ml of serum, and Fe-TBA value gave 2.4-fold of the TBA value. Although an increase TBA value was not observed by whole-body irradiation, a significant increase of Fe-TBA value was measured, indicating 2.5-fold at 10Gy exposure compared with the normal Fe-TBA value, and 5.5-fold with the TBA value. The TBA value of tumor-bearing mouse serum was 14nmoles/ml as a low rate to that of normal serum, but the Fe-TBA value gave same magnification of that of normal one. The TBA value of tumor-bearing mouse serum was not changed by the local irradiation to the tumor region of leg, but the Fe-TBA value was increased 2.8 and 4.4 times at 10Gy and 20Gy exposures, respectively, comparing with the non-irradiated one, and 7.7 and 10.5 times with the TBA value, respectively. The TBA value of solid tumor homogenate exhibited 1.16nmoles/mg of protein, and the Fe-TBA value, pointed out 5 times as much as the TBA value. Both values slightly increased by the irradiation. These facts suggest that a shift of TBA value of serum hard to get, but Fe-TBA value of serum distinctly increases by the irradiation. The fatty acid composition of mouse serum lipids showed an increment of relative percentages of linoleic and arachidonic acids by the whole-body irradiation. The relative percentage of fatty acid compositon of lipids from solid tumor-bearing mouse serum was similar tendency to that of normal one, and the local exposure to the tumor part was not affected the each percentage. The percentage of high unsaturated fatty acid of tumor lipids similar to that of serum lipids, and a decrease of the percentage of arachidonic acid was accounted by the irradiation. In relative percentages of lipid compositions, the percentage of choleste rolester of serum lipids increased by the whole-body irradiation, and that of phospholipid fraction was not changed. In the case of tumor-bearing mouse serum lipids, an increment of the percentage of cholesterolester was obtained as compared with that of normal serum lipids, and this percentage decreased by the local irradiation to tumor part with an increment of the percentage of phospholipid. The percentage of phospholipid in tumor lipids had decreased by the irradiation. The facts suggest that a cause of the increased Fe-TBA value of tumor-bearing mouse serum by the irradiation to tumor is due to the release of peroxidizable phospholipid into serum from the damaged menbranes of tumor cells at large doses to exposure. |
| Keywords | Lipid peroxides Irradiation Mouse serum Tumor-bearing mouse serum Fatty acid composition |
| Publication Title | 岡山大学医療技術短期大学部紀要 |
| Published Date | 1991-03-25 |
| Volume | volume1 |
| Start Page | 29 |
| End Page | 37 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313903 |
| JaLCDOI | 10.18926/11755 |
|---|---|
| Title Alternative | New Stepwedge for Bootstrap Sensitometry in Medical Radiography |
| FullText URL | 001_019_027.pdf |
| Author | Yoshida, Akira| Kobashi, Toshimi| Ohkawa, Yoshihiro| Mikami, Yasutaka| Hiraki, Yoshio| Azuma, Yoshiharu| Yamada, Toshiharu| Sugita, Katsuhiko| |
| Abstract | 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. |
| Keywords | Stepwedge Bootstrap Characteristic curves Sensitometry Radiographic screen/film systems |
| Publication Title | 岡山大学医療技術短期大学部紀要 |
| Published Date | 1991-03-25 |
| Volume | volume1 |
| Start Page | 19 |
| End Page | 27 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313394 |
| JaLCDOI | 10.18926/11750 |
|---|---|
| Title Alternative | Total Skin Electron Beam Therapy |
| FullText URL | 001_001_006.pdf |
| Author | Nakagiri, Yoshitada| Inamura, Keiji| Miyake, Hideaki| Tahara, Seiji| Mimura, Seiichi| Egusa, Tomomi| Mikami, Yasutaka| Yamada, Toshiharu| Sugita, Katsuhiko| Hiraki, Yoshio| |
| Abstract | The peripherally T-cell lymphoma; Mycosis fungoides etc, has the good radiation sensitivity, and has been adapted for total skin electron beam therapy. In this study the pendular irradiation method was used for the purpose of total skin electron beam therapy in Mycosis fungoides, and physical data on the radiation field and the electron beam energy were useful clinically. |
| Keywords | 電子線全身照射法 菌状息肉症 全身性皮膚疾患 |
| Publication Title | 岡山大学医療技術短期大学部紀要 |
| Published Date | 1991-03-25 |
| Volume | volume1 |
| Start Page | 1 |
| End Page | 6 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313887 |
| JaLCDOI | 10.18926/11735 |
|---|---|
| Title Alternative | Clinical application of the contrast media containing soft drinks for the X-ray examination of the stomach |
| FullText URL | 006_015_021.pdf |
| Author | Shibuya, Koichi| Nakagiri, Yoshitada| Azuma, Yoshiharu| Goto, Sachiko| Maruyama, Toshinori| Sugita, Katsuhiko| Okura, Yasuhiko| Natsukawa, Koichi| Tandani, Nobuyoshi| Nobuhara, Eitaro| Morioka, Yasuki| Takeda, Yoshihiro| Hiraki, Yoshio| |
| Abstract | 胃X線検査の被験者を増やし、検査を円滑に行う上で造影剤である硫酸バリウム懸濁液の飲みにくさが障害の一つとなっている。これを改善する目的で、懸濁液に市販の粉末清涼飲料を混入したところ、64.2％の人が通常のものよりも飲みやすいと答えた。臨床上も造影剤の付着が悪くなったり、胃の蠕動を促進する等の問題は生じず、有用であると考えられた。 |
| Keywords | 造影剤 (contrast media) 硫酸バリウム (barium sulfate suspension) 清涼飲料 (soft drinks) 消化管検査 (barium examination) |
| 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 | 15 |
| End Page | 21 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313345 |
| 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。 |
| 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 | Japanese |
| File Version | publisher |
| NAID | 120002313511 |
| JaLCDOI | 10.18926/11730 |
|---|---|
| Title Alternative | Measurement of intracellular pH by flow cytometry using pH sensitive fluorescence dye, and influence of hyperthermia and amiloride derivatives on the intracellular pH |
| FullText URL | 006_001_005.pdf |
| Author | Asaumi, Jun-ichi| Kawasaki, Shoji| Kuroda, Masahiro| Takeda, Yoshihiro| Hiraki, Yoshio| |
| Abstract | エールリッヒ腹水癌細胞とそのアドリアマイシン耐性細胞において蛍光pH指示薬2'、7'-bis-(2-carboxyethyl) carboxyfluorescein] (BCECF) の蛍光量をフローサイトメトリーで測定することによって細胞内pHの検量曲線を作成することができた。このことより、これらの細胞においてBCECFの蛍光量で細胞内pHの変化を簡易に比較できることを示唆した。さらに、温熱、Na(+)/H(+) exchanger の阻害例であるアミロライド[3,5-diamino-6-chloro-N-(diaminomethylene) pyrazinecarboxamide]、およびアミロライド誘導隊MH-12-43[N-amidino-3-amino-6-chloro-5-(N-ethyliso-propylamino) pyrazinecarboxyamide] の細胞内pHへの影響をエールリッヒ腹水癌細胞で観察した。37℃では、0.5mMアミロライド、0.05mM MH-12-43により細胞内pHは減少し、42℃処理によりさらに減少した。42℃において、0.05mM MH-12-43による細胞内pHの減少は、0.5mMアミロライドによる減少より大きかった。 |
| Keywords | BCECF 細胞内pH (Intracellular pH) フローサイトメトリー (Flow Cytometry) アミロライド (Amiloride) MH-12-43 |
| 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 | 1 |
| End Page | 5 |
| ISSN | 0917-4494 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313855 |
| JaLCDOI | 10.18926/11728 |
|---|---|
| Title Alternative | Rationalization of measures to protect the working environment in radiation controlled areas from the perspective of the relationship between surface and airborne contamination |
| FullText URL | 010_1_001_013.pdf |
| Author | Yamaoka, Kiyonori| Shibuya, Koichi| Nagamatsu, Tomohiro| Kawasaki, Shoji| |
| Abstract | 放射線管理区域において業務従事者の放射線防護が正確に実施されていることを確認するために放射性同位元素の環境測定が行われている。しかし，実際の測定においては，濃度が低いなど実測困難な場合が多いこと，多くの人手と経費を要していることから，より合理的な測定の実施ができないかということについての検討が期待されている。このため本総説では，まず大学などの放射線管理区域における作業環境測定方法の現状についてまとめた。次に，放射線管理区域の床，作業台などにおける放射性同位元素の表面汚染と空気汚染に着目し，汚染粒子の移行など表面汚染と空気汚染の関係機構について，また，スミア法や直接測定法などの各種表面汚染測定法の汚染採取効率などを指標とした特性とこれら測定法の改良の試みについてまとめた。さらに，実際の作業場所において，作業内容，換気，表面材料などが表面汚染と空気汚染の関係に及ぼす影響について，その検討例を紹介した。得られた知見をまとめるとともに，測定箇所・測定頻度の適性化やそれぞれの測定箇所に適した測定法の選定など作業環境測定の一層の合理化に向けて，今後どのような検討が必要なのかについて提案した。 |
| Keywords | 放射線管理区域 (radiation controlled area) 作業環境測定 (working environment measurement) 表面汚染測定法 (surface contamination measurement) スミア法 (smear test) 採取効率 (collecting efficiency) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 1999-12-20 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 13 |
| ISSN | 1345-0948 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002314017 |
| JaLCDOI | 10.18926/11726 |
|---|---|
| Title Alternative | 生体電気信号の計測システムへの電力線からの誘導障害に関するインターフェイスモデル |
| FullText URL | 010_2_107_115.pdf |
| Author | Adli| Yamamoto, Yoshitake| Nakamura, Takao| |
| Abstract | A modelling of interface construction relating to power-line interference phenomenon was described. Source of interference was displacement currents which flowed from AC power-line configuration (APC) to a model. The interference depends on some factors: distance between the APC and a model ; length of unshielded leads ; position of the APC in vertical or horizontal direction ; and skin-electrode impedances which were balance or unbalanced. The position of APC and skin-electrode impedances were important in contributing of the interference. The interference was still large even though skin-electrode impedances were balance. This was caused by the disagreement in two displacement currents. It was overcame by adjustment of APC in vertical direction. As a result, total interference would be very small or zero. The result shows that interference in ECG signal recording can be eliminated to about 10 μV. Although interference of power-lines is a complicated phenomenon, the problem is easier to understand by using this modelling. |
| Keywords | AC power-line configuration (APC) (電力線配置) biopotential signal (生体電気信号) displacement current (変位電流) physical model of interference (モデル) power-line interference (誘導障害) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2000-03-24 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 107 |
| End Page | 115 |
| ISSN | 1345-0948 |
| language | English |
| File Version | publisher |
| NAID | 120002313382 |
| JaLCDOI | 10.18926/11721 |
|---|---|
| Title Alternative | The influence of air attenuation in characteristic curve for mammographic screen-film system |
| FullText URL | 010_2_091_098.pdf |
| Author | Maruyama, Toshinori| Goto, Sachiko| Azuma, Yoshiharu| Nakagiri, Yoshitada| Shibuya, Koichi| Sugita, Katsuhiko| |
| Abstract | マンモグラフィ専用装置を使用して，距離法で低エネルギー領域のX線におけるマンモグラフィ用増感紙／フィルムシステムの特性曲線を得るためには，空気滅弱の影響を考慮する必要がある。その影響について，実効エネルギーから空気減弱分を補正，照射線量測定による補正，Bednarek法を応用した新距離法の3種類の方法を使って検討した。さらに，一般撮影装置でも，マンモ用システムに対して距離法で特性曲線を作成し，エネルギ ーの変化による影響についても検討した。その結果，3方法の特性曲線およびグラディエント曲線は，新距離法が高濃度域でわずかにずれるもののほぼ一致した。新距離法に対する平均階調度，最大階調度の最大誤差は，2.7％，0.2％であり，一般撮影用装置の距離法と3方法との間では，一般撮影用装置の距離法に対して最大誤差は2.7％，1.5％であった。以上のことから，エネルギーの変化による特性曲線への影響はほとんどなく，低エネルギー領域での特性曲線は空気特配の補正を行うことのみで得られると考えられる。 |
| Keywords | マンモグラフィ (mammography) 低エネルギー領域 (low x-ray energy) 特性曲線 (characteristic curve) 距離法 (inverse square sensitometry) 空気減弱 (air attenuation) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2000-03-24 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 91 |
| End Page | 98 |
| ISSN | 1345-0948 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313929 |
| JaLCDOI | 10.18926/11719 |
|---|---|
| Title Alternative | Influence on the character of films used for density control of an automatic processor by the difference in the way of preserving |
| FullText URL | 010_1_023_028.pdf |
| Author | Ohno, Seiichiro| Yoshida, Akira| Inoue, Tatsuya| Kobashi, Toshimi| Morioka, Yasuki| Nakagiri, Yoshitada| |
| Abstract | 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。 |
| Keywords | 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) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 1999-12-20 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 23 |
| End Page | 28 |
| ISSN | 1345-0948 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313437 |
| JaLCDOI | 10.18926/11716 |
|---|---|
| Title Alternative | Variations of parameters of bioelectrical impedance during upper limb movement |
| FullText URL | 010_1_015_022.pdf |
| Author | Nakamura, Takao| Yamamoto, Yoshitake| |
| Abstract | これまでに生体電気インピーダンスを用いて身体運動の解析を行ってきた。インピーダンスの変動原因は測定部位の等価断面積変化および貯血量変化と説明できるが，直接的に断面積変化や貯血量変化を測定することは困難であるため，その変動原因の定量的な検討は不十分であった。そこで，本研究では上肢運動に伴う生体電気インピーダンスの変動原因を生体の等価回路のパラメータの変動で説明する。インピーダンスのモデルはCole－Cole型であり，等価回路は，細胞外液抵抗Re，細胞内液抵抗Ri，分散の特性周波fm fm，緩和時間の分布の程度を表すα，βの独立した5パラメータで表現した。 上肢の肘関節および手関節の屈曲運動野に伴う前腕部および上腕部の電気インピーダンスを測定した。まず，電気インピーダンスの等価直列抵抗Rの変動率をパラメータの変動率で線形近似し，その信頼性と各パラメータ変動のRへの影響を確認した。Rへの影響はReとRiが支配的であるが，測定部位や運動の違いにより，それぞれの影響が異なることを示した。これは測定部位の筋活動状態の違いを表すものである。さらに，肘関節最大屈曲におけるRの変化にはfmの変化が大きく依存しており，上肢運動のインピーダンス変化には細胞膜の分極特性の変化も影響していることを明らかにした。本研究の結果は，運動強度の違いや疲労状態における身体運動評価に有意義である。 |
| Keywords | 生体電気インピーダンス (bioelectrical impedance) 等価回路 (equivalent circuit) Cole-Cole円弧 (Cole-Cole circular loci) 上肢運動 (upper limb movement) 4電極法 (four electrode method) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 1999-12-20 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 15 |
| End Page | 22 |
| ISSN | 1345-0948 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002314002 |
| JaLCDOI | 10.18926/11714 |
|---|---|
| Title Alternative | スクリーン／フィルム乳房撮影法における乳房線量測定システム |
| FullText URL | 010_2_099_106.pdf |
| Author | Goto, Sachiko| Azuma, Yoshiharu| Maruyama, Toshinori| Nakagiri, Yoshitada| Takeda, Yoshihiro| Sugita, Katsuhiko| Kadohisa, Shigefumi| |
| Abstract | The average glandular dose to glandular tissue m mammography is generally assumed to be a function of beam quality (HVL), x-ray tube target material, tube voltage, breast thickness, breast composition and, to a lesser extent, x-ray tube voltage waveform. The average glandular dose is generally determined from published tables with knowledge of the above function. Tables for a high frequency x-ray generator are not yet published. In our study, the lookup tables for the average glandular dose were made at 28 kV (high frequency x-ray generator), employing a breast simulating tissue (0-100% adipose tissue, 0-100% glandular tissue) phantom for an Mo target - Mo filter source assembly. We tried to estimate breast composition from x-ray mammograms by digital image processing techniques, also using the simulating tissue phantom. Then the system that automatically calculates the average glandular dose from digitized clinical x-ray mammograms was built. It is considered that this system can contribute to objective evaluation of the average glandular dose. |
| Keywords | Screen/Film Mammography (スクリーン／フィルム乳房撮影法) Breast composition (乳房構成) Average glandular dose (平均乳腺線量) Entrance skin exposure (皮膚入射線量) Breast-equivalent material phantom (乳房組織等価ファントム) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2000-03-24 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 99 |
| End Page | 106 |
| ISSN | 1345-0948 |
| language | English |
| File Version | publisher |
| NAID | 120002313736 |
| JaLCDOI | 10.18926/11711 |
|---|---|
| Title Alternative | Approach on the simple and easy method for measurement of airborne radioactive iodine((125)I) |
| FullText URL | 011_1_035_039.pdf |
| Author | Shibuya, Koichi| Yamaoka, Kiyonori| Nagamatsu, Tomohiro| Kawasaki, Shoji| Hiraki, Yoshio| |
| Abstract | 放射性ヨウ素（(123)I，(125)I，(131)I）は飛散しやすいなどの特性があり，他の放射性核種に比べ慎重な取扱いが求められている。また，この核種の空気中濃度限度は非常に低く，濃度測定には大量の空気を吸引しなければならず，そのための装置も大掛かりとなる。このため，本研究では，活性炭ろ紙をホルダにセットし，これを注射器に取り付けた簡易な装置を考案・試作し，空気中の放射性ヨウ素濃度を簡便に測る方法について実験・検討した。その結果，まず放射性ヨウ素にNa(125)Iを用いた場合の捕集効率は44.5％であることが分かった。次に，50mℓ注射器を用いて1ℓの空気を吸引・ろ過し，Nal（Tl）ウェルタイプシンチレーションカウンタで30分間放射能を測定した場合，本装置では空気中濃度限度の2.12倍の濃度の(125)Iが測定可能であり，気体状ヨウ素の漏れを防いで捕集効率を94.3％以上に上げることができれば，空気中濃度限度まで測定可能であることが示された。このため，本法は簡便かつ安価に異常を検知する測定方法として利用できるのではないかと考えられた。 |
| Keywords | (125)I (radioactive iodine-125) 空気中濃度限定 (air concentration limit) 活性炭ろ紙 (charcoal filter) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2000-11-16 |
| Volume | volume11 |
| Issue | issue1 |
| Start Page | 35 |
| End Page | 39 |
| ISSN | 1345-0948 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313683 |
| JaLCDOI | 10.18926/11705 |
|---|---|
| Title Alternative | Clinical study on polypoid lesions of the colon |
| FullText URL | 061_036_040.pdf |
| Author | Ochi, Koji| Harada, Hideo| Matsumoto, Shuji| Seno, Toshinobu| Tanaka, Juntaro| Tachibana, Hideo| Akiyama, Tsuneo| Nakai, Mutsuo| |
| Abstract | 1986年4月から1990年2月末までの間に岡山大学医学部附属病院三朝分院で経験した早期大腸癌を含む大腸ポリープ90例（107病変）を対象に，年齢，臨床症状，便潜血反応，病変存在部位について検討を行い，以下の成績を得た。(1)大腸検査総数の22.4％にポリープが発見された。ポリープの77％は腺腫，5％は腺癌（早期癌）であった。(2)便潜血反応はポリープ例の75.9％に陽性であり，右側大腸ポリープでの陽性率は高かったが，S状結腸および直腸ポリープでは70％程度であった。(3)若年者では右側結腸にポリープが発見されることは稀であるが，50才以上では18％程度に認められた。高齢者では右側結腸も内視鏡で検査することが重要である。(4)免疫学的便潜血検査法の導入により大腸ポリープの発見効率が改善するものと考え られた。 |
| Keywords | 大腸ポリープ (Polyp of the colon) 大腸早期癌 (Early cancer of the colon) |
| Publication Title | 環境病態研報告 |
| Published Date | 1990-09 |
| Volume | volume61 |
| Start Page | 36 |
| End Page | 40 |
| ISSN | 0913-3771 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313590 |
