Study on non-uniformity correction of the Gafchromic film and three-dimensional measurement of CT

• Project/Area Number: 17K10380
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Radiation science
• Research Institution: Osaka Butsuryo University
• Principal Investigator: Katsuda Toshizo 大阪物療大学, 保健医療学部, 教授 (40379722)
• Co-Investigator(Kenkyū-buntansha): 野口 敦司 大阪物療大学, 保健医療学部, 教授 (10716202) ; 丹喜 信義 大阪物療大学, 保健医療学部, 助教 (60441573)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: エックス線 / CT / 線量計測 / ラジオクロミックフィルム / 三次元計測 / Radiochromic films / Computed Tomography / ガフクロミックフィルム / 線量分布 / 三次元線量計測 / 半円柱ファントム / 三次元線量分布 / Radiochromic film / 不均一性 / 紫外線ーA / ガフクロミック フィルム / 均一性

Outline of Final Research Achievements

The correction method of an uncertainty at low-dose range and non-uniformity error have been developed for three-dimensional X-ray CT dosimetry using a film-type dosimeter. The density equivalent to the beginning of the linear portion of the density-dose curve was used as the base density, and the uncertainty line portion of 2 to 10 mGy was corrected. In addition, double exposure method using ultraviolet rays for correcting non-uniformity error. In this film type dosimeter, the density increases in the white LED. Based on the principle of white LEDs, it was divided into yellow and blue, and it was clarified that the influence of blue light with a wavelength of 410 nm, which is almost the wavelength of ultraviolet light, is strong. In addition, for the creation of the three-dimensional dose distribution map, the two-dimensional plane dose distribution was rotated to create an image of the cross section of the virtual three-dimensional dose distribution.

Academic Significance and Societal Importance of the Research Achievements

X線CTの線量分布の把握は困難である．3次元的かつ連続的に変化するX線量を高分解で把握することは新たな計測方法の開発として学術的な意義がある．特に最近多くの施設で行われている一度に広い範囲を検査できる検査方法についての線量計測法は現状の方法では大変困難が伴う．しかし，本方法では検査領域の広さにとらわれず，どのような場合においても線量計測が簡便にできるという学術的な意義がある．
また，現状では実際のX線量が把握でき，撮影方法の工夫や新たな方法の開発によって線量を低減させることも可能となることで社会的意義がある．

Research Products

• [Journal Article] Temporal Characterization of the Flat-Bed Scanner Influencing Dosimetry Using Radiochromic Film (2019)
  • Author(s): Rumi Gotanda, Toshizo Katsuda, Tatsuhiro Gotanda, Nobuyoshi Tanki, Hidetoshi Yatake, Yasuyuki Kawaji, Tadao Kuwano, Takuya Akagawa, Akihiko Tabuchi, Atsushi Ono, Shinichi Arao
  • Journal Title: IFMBE Proceedings Volume: 68 Pages: 537-539
  • DOI: 10.1007/978-981-10-9023-3_97
  • ISBN: 9789811090226, 9789811090233
  • Peer Reviewed
• [Journal Article] Evaluation of effective energy distribution of 320-multidetector CT using GAFCHROMIC EBT3 (2018)
  • Author(s): Tatsuhiro Gotanda, Toshizo Katsuda, Rumi Gotanda, Takuya Akagawa, Tadao Kuwano, Nobuyoshi Tanki, Hidetoshi Yatake, Yasuyuki Kawaji, Takashi Amano, Shinichi Arao, Atsushi Ono, Akihiko Tabuchi
  • Journal Title: International Fedration Medical and Biological Engineering Proceedings Volume: 68（3） Pages: 525-528
  • DOI: 10.1007/978-981-10-9023-3_94
  • ISBN: 9789811090226, 9789811090233
  • Peer Reviewed
• [Journal Article] Determining optimum wavelength of ultraviolet rays to pre-exposure of non-uniformity error correction in Gafchromic EBT2 films (2018)
  • Author(s): Toshizo KATSUDA, Rumi GOTANDA, Tatsuhiro GOTANDA, Takuya AKAGAWA, Nobuyoshi TANKI, Tadao KUWANO, Atsushi NOGUCHI, Kouichi YABUNAKA
  • Journal Title: Polish Journal of Medical Physics and Engineering Volume: 24 Issue: 1 Pages: 11-14
  • DOI: 10.2478/pjmpe-2018-0002
  • Peer Reviewed / Open Access
• [Journal Article] Ultraviolet ray irradiation duration for the pre-exposure of Gafchromic EBT2. (2018)
  • Author(s): Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Takuya Akagawa, Nobuyoshi Tanki, Tadao Kuwano, Atsushi Noguchi, Kouichi Yabunaka
  • Journal Title: Polish Journal of Medical Physics and Engineering Volume: 24 Issue: 4 Pages: 189-193
  • DOI: 10.2478/pjmpe-2018-0026
  • Peer Reviewed / Open Access
• [Journal Article] Size and Shape of Spherical Objects on Full-Field Digital Mammography and Digital Breast Tomosynthesis Images. (2018)
  • Author(s): Hidetoshi Yatake, Yuka Sawai, Takahiro Kozuka, Yoshihiro Takeda, Mariko Kajihara, Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Shuji Abe, Makoto Shimada, Nobuyoshi Tanki, Toshio Nishi, Hideo Inaji
  • Journal Title: IFMBE Proc. Volume: 68 Pages: 45-48
  • Peer Reviewed
• [Journal Article] Influence of Image Resolution Property on Aliasing Error of Digital Wiener Spectrum. (2018)
  • Author(s): Yasuyuki Kawaji, Tatsuhiro Gotanda, Tetsunori Shimono, Nobuyoshi Tanki, Toshizo Katsuda, Rumi Gotanda, Tadao Kuwano, Takuya Akagawa
  • Journal Title: IFMBE Proc. Volume: 68 Pages: 147-150
  • Peer Reviewed
• [Journal Article] Optimal Variable Refocus Flip Angle Control Method and Echo Train Length for Suppressing Exposure to Radio Frequency (2018)
  • Author(s): kihiko Tabuchi, Shinichi Arao, Toshizo Katsuda, Atsushi Ono, Tatsuhiro Gotanda, Rumi Gotanda
  • Journal Title: IFMBE Proc. Volume: 68 Pages: 21-25
  • Peer Reviewed
• [Journal Article] Temporal characterization of the flat-bed scanner influencing dosimetry using radiochromic film. (2018)
  • Author(s): Rumi Gotanda, Toshizo Katsuda, Tatsuhiro Gotanda, Nobuyoshi Tanki, Hidetoshi Yatake, Yasuyuki Kawaji, Tadao Kuwano, Takuya Akagawa, Akihiko Tabuchi, Atsushi Ono, Shinichi Arao
  • Journal Title: IFMBE Proc. Volume: 68 Pages: 537-539
  • Peer Reviewed
• [Journal Article] Evaluation of effective energy distribution of 320-multidetector CT using GAFCHROMIC EBT3. (2018)
  • Author(s): Tatsuhiro Gotanda, Toshizo Katsuda, Rumi Gotanda, Takuya Akagawa, Tadao Kuwano, Nobuyoshi Tanki, Hidetoshi Yatake, Yasuyuki Kawaji, Takashi Amano, Shinichi Arao, Atsushi Ono, Akihiko Tabuchi
  • Journal Title: IFMBE Proc. Volume: 68 Pages: 525-528
  • Peer Reviewed
• [Journal Article] Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films (2017)
  • Author(s): Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Takuya Akagawa, Nobuyoshi Tanki, Tadao Kuwano, Atsushi Noguchi, Kouichi Yabunaka
  • Journal Title: Journal of Medical Physics Volume: 42 Issue: 2 Pages: 86-89
  • DOI: 10.4103/jmp.jmp_136_16
  • Peer Reviewed / Open Access
• [Journal Article] Ultraviolet Ray Strength for Pre-irradiation in Gafchromic EBT2 (2017)
  • Author(s): T Katsuda, R Gotanda, T Gotanda, T Akagawa, N Tanki, A Noguchi, T Kuwano, K Yabunaka
  • Journal Title: IFMBE Proceedings Volume: 65 Pages: 386-389
  • DOI: 10.1007/978-981-10-5122-7_97
  • ISBN: 9789811051210, 9789811051227
  • Peer Reviewed
• [Presentation] Optimization of lens exposure measurement in IVR (2020)
  • Author(s): S Imai, N Tanki, H Satoh, Y Ogata, E Kinoshita, K Fujiwara, T Katsuda
  • Organizer: European Congress of Radiology
  • Int'l Joint Research
• [Presentation] Correction of dose-pixel value calibration curve of Gafchromic film at low dose area for 3D measurement of the CT (2020)
  • Author(s): Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Takuya Akagawa, Nobuyoshi Tanki, Atsushi Noguchi, Shinya Imai, Tadao Kuwano, Kouichi Yabunaka
  • Organizer: European Congress of Radiology
  • Int'l Joint Research
• [Presentation] The investigation of evaluation method for 3D model quality. (2019)
  • Author(s): N Tanki, H Yatake, T Gotanda, F Kobayashi, R Gotanda, Y Kawaji, A Noguchi, T Katsuda, Y Takeda
  • Organizer: European Congress of Radiology
  • Int'l Joint Research
• [Presentation] Three-dimensional dose measurement methods for computed tomography (2019)
  • Author(s): T Katsuda, R Gotanda, T Gotanda, T Akagawa, N Tanki, A Noguchi, T Kuwano, K Yabunaka
  • Organizer: German Society of Medical Physics
  • Int'l Joint Research
• [Presentation] Gafchromic XR-QA2の低線量領域不確実性の補正法の一考察 -紫外線照射量- (2019)
  • Author(s): 勝田稔三
  • Organizer: 多次元線量計測学会
• [Presentation] The investigation of evaluation method for 3D model quality (2019)
  • Author(s): Osako, K; Tanki, N; Noguchi, A; Katsuda, T.
  • Organizer: European Congress of Radiology 2019
  • Int'l Joint Research
• [Presentation] The verification of X-ray mammography dosimetry using radiochromic film. (2019)
  • Author(s): Tanki, N; Yatake, H; Gotanda, T; Kobayashi, F; Gotanda, R; Kawaji, Y; Noguchi, A; Katsuda, T; Takeda, Y
  • Organizer: European Congress of Radiology 2019
  • Int'l Joint Research
• [Presentation] Comparison of UV-A sensitivity exposed from front side and back side in Gafchromic XR-RV3: preliminary study. (2018)
  • Author(s): Katsuda, T; Gotanda, R; Gotanda, T; et al.
  • Organizer: World Congress on Medical Physics and biomedical Engineering,
  • Int'l Joint Research
• [Presentation] Efficiently X-ray CT dosimetry procedure using radiochromic film and film-folding type phantom.Efficiently X-ray CT dosimetry procedure using radiochromic film and film-folding type phantom. (2018)
  • Author(s): Tanki, N; Katsuda, T; Gotanda, R; et al.
  • Organizer: World Congress on Medical Physics and biomedical Engineering
  • Int'l Joint Research
• [Presentation] Temporal characterization of the flat-bed scanner influencing dosimetry using radiochromic film. (2018)
  • Author(s): Gotanda, R; Katsuda, T; Gotanda, T; et al.
  • Organizer: World Congress on Medical Physics and biomedical Engineering
  • Int'l Joint Research
• [Presentation] Evaluation of effective energy distribution of 320-multidetector CT using GAFCHROMIC EBT3 (2018)
  • Author(s): Gotanda, T; Katsuda, T; Gotanda, R; et al.
  • Organizer: World Congress on Medical Physics and biomedical Engineering
  • Int'l Joint Research
• [Presentation] CT dose distribution of 10 cm (infants) and 16 cm (adult) by a head CT phantom. (2018)
  • Author(s): Noguchi, A; Katsuda, T; Tanki, N; et al.
  • Organizer: 2nd European Congress of Medical Physics,
  • Int'l Joint Research
• [Presentation] The influence of phantom diameter on X-ray CT dose evaluation using radiochromic film. (2018)
  • Author(s): Tanki, N; Katsuda, T; Noguchi, A; et al.
  • Organizer: 2nd European Congress of Medical Physics,
  • Int'l Joint Research
• [Presentation] Pre-irradiation duration of Gafchromic XR-QA2 for correction of non-uniform error (2018)
  • Author(s): Toshizo Katsuda, Atsushi Noguchi, Nobuyoshi Tanki, Hiroki Higashiyama, Tomohiro Konishi, Kousuke Oheda, Kazuya Kurahashi, Aayumi Hirashima, Shinya Imai
  • Organizer: ECR2018
  • Int'l Joint Research
• [Presentation] X-ray CT dosimetry using radiochormic film and film-folding phantom: preliminary outcome (2018)
  • Author(s): Nobuyoshi Tanki, Toshizo Katsuda, Atsushi Noguchi, Shinya Imai, Yuuna Sugihara, Tadao Kuwano, Rumi Gotanda, Tatsuhiro Gotanda, Yoshihiro Takeda
  • Organizer: ECR2018
  • Int'l Joint Research
• [Presentation] Development of ultraviolet ray irradiation device for Gafchromic XR-SP2 films (2017)
  • Author(s): T Katsuda, R Gotanda, T Gotanda, A Sasaki, T Akagawa, N Tanki, A Noguchi, T Kuwano, K Yabunaka
  • Organizer: BMTMedPhys2017
  • Int'l Joint Research
• [Presentation] Ultraviolet Ray Strength for Pre-irradiation in Gafchromic EBT2 (2017)
  • Author(s): T Katsuda, R Gotanda, T Gotanda, T Akagawa, N Tanki, A Noguchi, T Kuwano, K Yabunaka
  • Organizer: EMBEC+NBC2017
  • Int'l Joint Research
• [Presentation] Evaluation of novel film-folding type phantom for X-ray CT dosimetry (2017)
  • Author(s): Nobuyoshi Tanki, Toshizo Katsuda, Tadao Kuwano, Rumi Gotanda, Tatsuhiro Gotanda, Tomoya Oue, Yuuna Sugihara, Shinya Imai, Takuya Akagawa, Yasuyuki Kawaji,
  • Organizer: 8th JKMP2017
  • Int'l Joint Research