九州大学 研究者情報
発表一覧
井手口 忠光(いでぐちただみつ) データ更新日:2024.06.03

准教授 /  医学研究院 保健学部門


学会発表等
1. Masaru Tateishi,Tadamitsu Ideguchi, Examination of SSIM and MS-SSIM as The New Image Evaluation Methods in X-ray CT Images, 2024 European Congress of Radiology, 2023.02.
2. 北島和孝, 井手口忠光, 円形Edgeを用いた新たな画像鮮鋭度解析法の検討, 令和5年度秋季(第197回)大会 医用画像情報学会, 2023.10.
3. 北島和孝, 井手口忠光 学生:1人,学生以外:1人, 円形Edgeを用いた新たな画像鮮鋭度解析法の検討, 令和5年度秋季(第197回)大会 医用画像情報学会, 2023.10.
4. 田畑成章, 伊地知哲也, 板井宏孝, 立石賢, 北健斗, 原優菜, 井上敏郎, 井手口忠光, Image quality evaluation of digital X-ray images using Structural Similarity
and Multi-Scale Structural Similarity, 令和5年度秋季(第197回)大会 医用画像情報学会, 2023.10.
5. 田畑成章, 伊地知哲也, 板井宏孝, 立石賢, 北健斗, 原優菜, 井上敏郎, 井手口忠光, 一対比較法における深層学習を用いた観察者不足改善手法の提案, 第51回 日本放射線技術学会秋季学術大会, 2023.10.
6. 立石賢, 田畑成章, 板井宏孝, 井手口忠光, X線CT画像における新しい画質評価法SSIMおよびMS-SSIMの検討
Examination of a new image evaluation method SSIM and MS-SSIM in X-ray CT images, 第51回 日本放射線技術学会秋季学術大会, 2023.10.
7. 田畑成章, 伊地知哲也, 板井宏孝, 立石賢, 尾畑麻美, 中村裕範,井手口忠光, プログラム言語pythonによる一対比較法ソフトウェアの開発
Title: Development of pairwise comparison method software in the programming language Python, 第79回日本放射線技術学会総会学術大会, 2023.04.
8. 板井宏孝, 是枝大地, 田畑成章, 立石賢, 井手口忠光 , 画像構造類似度SSIM(MS-SSIM)を用いたデジタルX線画像の画質評価」
Image quality evaluation of digital X-ray images using structural similarity SSIM (MS-SSIM), 第79回日本放射線技術学会総会学術大会, 2023.04.
9. 田中延和, 田畑成章, 大藤孝文, 猪本奈美, 加藤豊幸,井手口忠光, 胸部X線画像のSSIM評価における測定領域とノイズ抑制処理の強調度の関係
Relationship between measurement region and emphasis of noise suppression processing in SSIM evaluation of chest X-ray image, 第79回日本放射線技術学会総会学術大会, 2023.04.
10. 立石賢,田畑成章,板井宏孝, 井手口忠光 , X線CT画像における新しい画像評価法SSIM(MS-SSIM)の検討
Examination of a new image evaluation method SSIM (MS-SSIM) in X-ray CT image, 第79回日本放射線技術学会総会学術大会, 2023.04.
11. 北 健斗,田中延和,田畑成章,大藤孝文,猪本奈美,加藤豊幸,井手口忠光, マルチ施設データを用いた腰椎target EIの検討:ノイズ抑制処理の効果
Title: Validation of target EI for lumbar spine based on multiple-facility data: Effect of noise suppression processing., 第79回日本放射線技術学会総会学術大会, 2023.04.
12. 田畑成章,立石賢,板井宏孝,井手口忠光, Cycle GAN(GAN)を用いたX線撮影トレーニングツールの開発, 第17回九州放射線医療技術学術大会, 2022.11.
13. 立石賢,田畑成章,板井宏孝,井手口忠光, X線CT画像におけるSSIM(MS-SSIM)を用いた新たな画像評価法の検討, 第17回九州放射線医療技術学術大会, 2022.11.
14. 板井宏孝,是枝大地,田畑成章,立石賢,井手口忠光, デジタルX線画像における新しい画質評価法の検討, 第17回九州放射線医療技術学術大会, 2022.11.
15. 北 健斗, 仲山明日香,田中延和, 田畑成章, 立石 賢, 加藤豊幸,井手口忠光, マルチ施設データを用いたtarget EI決定に関する研究-FNCが画質に与える影響-, 第17回九州放射線医療技術学術大会, 2022.11.
16. 仲山明日香, 北 健斗, 田中延和, 田畑成章, 立石 賢, 加藤豊幸,井手口忠光, マルチ施設データを用いたtarget EI決定に関する研究-SSIMによる画質解析-, 第17回九州放射線医療技術学術大会, 2022.11.
17. Nobukazu Tanaka, Nariaki Tabata, Takafumi Ohfuji, Toyoyuki Kato, Tadamitsu Ideguchi , Evaluation of Emphasis of Noise Suppression Processing Technology Using Structural Similarity Index, The 1st Internatinal Conference on Radiological Physics and Technology, 2022.04.
18. 秋貞幸佑,井手口忠光,近藤雅敏, 腹部領域における線質硬化がDECT仮想単色X線画像に与える影響について, 第16回九州放射線医療技術学術大会, 2021.12.
19. 濱田美知,田中延和,加藤豊幸,氷室和彦,中村秀俊,大藤孝文,田中亮治,門崎都,猪本奈美,桑水流純平,井手口忠光, マルチ施設データを用いたEIt設定に関する研究, 第16回九州放射線医療技術学術大会, 2021.12.
20. 戸上 茉理、田中 延和、Yoon Yongsu、井手口 忠光, 骨盤撮影における線量指標と画像の評価, 第16回九州放射線医療技術学術大会, 2021.12.
21. 荒川 桜、田中 延和、井手口 忠光, X線斜入射が散乱線補正処理と低格子比グリッドの併用システムの画質に及ぼす影響, 第16回九州放射線医療技術学術大会, 2021.12.
22. 田中延和,井手口忠光, FPDシステムの線量指標と基本的な画像特性の検証, 第49回日本放射線技術学会秋季学術大会, 2021.10.
23. Nobukazu Tanaka, Tadamitsu Ideguchi, Relationship Between Exposure Index and Detector Performance for an Indirect-Conversion-Type Flat-Panel Detector System, Korean Society of Radiological Science Conference (KSRSC) , 2021.05.
24. 林美聖、井手口忠光, Virtual GridがExposure Indexに与える影響
, 第15回九州放射線医療技術学術大会, 2020.11.
25. 今村瑛三郎、鬼塚泰弘、近藤雅敏、井手口忠光, Dual Energy CTのデータ収集システムの違いによる画質の検討, 第15回九州放射線医療技術学術大会, 2020.11.
26. 西原晃佑、鬼塚泰弘、近藤雅敏、井手口忠光, FBPと逐次近似(IR)計算手法による画質評価, 第15回九州放射線医療技術学術大会, 2020.11.
27. 伊津野拓真、鬼塚泰弘、近藤雅敏、井手口忠光, Dual Energy CTのデータ収集システムの違いによる画質の検討
, 第15回九州放射線医療技術学術大会, 2020.11.
28. Souichiro Kawaguchi, Yoshiki Yamaguchi, Hidetaka Arimura, Junji Morishita, Masafumi Ohki, Yoshinori Uno, Tadamitsu Ideguchi, Yoshiharu Higashida, Fukai Toyofuku, Reconstruction of mammography x-ray spectrum by using Rayleigh and Compton scattering corrections, World Congress on Medical Physics and Biomedical Engineering: Diagnostic Imaging, 2009.12, [URL], The analysis of the x-ray spectrum is important for quality assurance (QA) and quality control (QC) of a radiographic system such as mammography. In the case of mammography, the direct measurement of the primary x-ray spectra under clinical conditions is very difficult and time-consuming mainly because it is almost impossible to increase the longitudinal distance between the focal spot and x-ray detector in order to make the photon counting measurement possible. An alternative way of measuring the primary spectra is to correct the 90 degree scattered x-ray spectra which can be measured without photon pile-up since the intensity of the scattered x-rays is significantly lowered. The scattered x-ray spectrum is composed of two components, Compton scattered photons and Rayleigh scattered photons. We have developed a new method of reconstructing the primary x-ray spectrum from the scattered x-ray spectrum taking into account both Rayleigh and Compton scattered photons . The 90 degree scattered x-ray spectrum from a 28 kV mammography x-ray unit was measured at a tube voltage by using a CdTe semiconductor detector. The reconstructed spectrum agreed fairly well with a directly measured primary x-ray spectrum. The Rayleigh and Compton scattering correction method could be suitable for measuring the mammography x-ray spectra under clinical conditions and useful for QA and QC of the mammography x-ray units..
29. Yoshiki Yamaguchi, Souichiro Kawaguchi, Hidetaka Arimura, Junji Morishita, Masafumi Ohki, Yoshinori Uno, Tadamitsu Ideguchi, Kenji Tokumori, Yoshiharu Higashida, Fukai Toyofuku, Rayleigh and Compton scattering analysis for PMMA in the mammography energy range, World Congress on Medical Physics and Biomedical Engineering: Diagnostic Imaging, 2009.12, [URL], The method of obtaining the primary x-ray spectrum by the Compton scattering correction has been practically established for relatively high x-ray tube voltages. However, for mammography, the tube voltages are less than 30 to 35 kV and there exists an intense characteristic x-ray peak at 17.5 keV from the molybdenum target. The influence of Rayleigh scattering can not be neglected in this mammography energy range. Accurate data of Rayleigh and Compton cross sections for the scatterer material are required for obtaining the primary x-ray spectrum by correcting the scattered x-ray spectrum of mammography. The purpose of this study is to investigate the Rayleigh and Compton scattering cross sections for PMMA scatterer material in the mammography energy range theoretically and experimentally. Fluorescent x-rays of 15 to 25 keV were generated by exciting four metal targets including molybdenum by synchrotron radiation. The produced fluorescent x-rays were incident on a sphere of PMMA (polymethyl methacrylate), and scattered x-rays at 90, 120, 150, and 165 degrees, respectively, were measured with a CdTe detector. The scattered fluorescent x-ray spectrum was separated into the Rayleigh and Compton scattering peaks by using a curve fitting technique with two Gaussian functions. We compared the measured cross section data to those obtained from theoretical values. In addition, we calculated the scattered fluorescent x-ray spectra using the Monte Carlo simulation and compared them to the measured spectra. As a result, the ratio of the Rayleigh to the total scattering ratio agreed to theoretical value within 10%. The shapes of the scattered spectra calculated by Monte Carlo simulation agreed fairly well with those of measured spectra..

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