Updated on 2023/03/27

写真a

 
KUMAGAI Motoki
 
Organization
Nagoya University Hospital Radiology Assistant professor of hospital
Title
Assistant professor of hospital

Degree 1

  1. 博士(保健学) ( 2011.3   新潟大学 ) 

 

Papers 6

  1. Effectiveness of Porous Glass Membrane Pumping Emulsification Device in Transarterial Chemoembolization for Solitary Hepatocellular Carcinoma

    Imai Norihiro, Ishigami Masatoshi, Oie Yumi, Kumagai Motoki, Inukai Yosuke, Yokoyama Shinya, Yamamoto Kenta, Ito Takanori, Ishizu Yoji, Honda Takashi, Kawashima Hiroki

    ANTICANCER RESEARCH   Vol. 42 ( 8 ) page: 3947 - 3951   2022.8

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    Language:English   Publisher:Anticancer Research  

    Background/Aim: A porous glass membrane-pumping emulsification device (GMD) enables the formation of a high-percentage water-in-oil emulsion with homogeneous and stable droplets. Although GMD is expected to improve the locoregional therapeutic effects of transarterial chemoembolization (TACE) in hepatocellular carcinoma (HCC), its effectiveness in the management of solitary HCC remains unclear. Patients and Methods: Patients treated for solitary HCCs (<5 cm) were retrospectively reviewed. A total of 46 patients who could not undergo liver resection and were unsuitable for radiofrequency ablation were included in this study. Among these, 22 patients underwent TACE using a GMD (GMD-TACE group) and 24 underwent stereotactic body radiotherapy (SBRT) using a robotic radiosurgery system (SBRT group). Local control rates were compared between the two groups. Results: The median HCC tumour size was 24 mm (range=12-50 mm) and 22 mm (range=8-39 mm) in the GMD-TACE and SBRT groups, respectively; however, the difference between the groups was not significant. Age, liver function test results, or Child-Pugh scores were not significantly different between the two groups. The rate of local control at 6 months after treatment was 100% in both groups. Although the 1-year local control rate was higher in the SBRT group (92.3%) than in the GMD-TACE group (81.8%), there was no significant difference in the log-rank test (p=0.654). No major treatment-related complications occurred in either group during the observation period. Conclusion: TACE with GMD could be considered an effective treatment option for the management of solitary HCC.

    DOI: 10.21873/anticanres.15889

    Web of Science

    Scopus

    PubMed

  2. The Impact of System-Related Magnetic Resonance Imaging Geometric Distortion in Stereotactic Radiotherapy: A Case Report Reviewed

    Kumagai Motoki, Kawamura Mariko, Kato Yutaka, Okudaira Kuniyasu, Naganawa Shinji

    CUREUS JOURNAL OF MEDICAL SCIENCE   Vol. 14 ( 7 ) page: e27269   2022.7

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    Authorship:Lead author   Language:English  

    DOI: 10.7759/cureus.27269

    Web of Science

    PubMed

  3. Hybrid 3D T1-weighted gradient-echo sequence for fiducial marker detection and tumor delineation via magnetic resonance imaging in liver stereotactic body radiation therapy

    Kato Yutaka, Kamomae Takeshi, Kumagai Motoki, Oie Yumi, Noguchi Yumiko, Okudaira Kuniyasu, Kawamura Mariko, Taoka Toshiaki, Naganawa Shinji

    PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS   Vol. 95   page: 9 - 15   2022.3

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    Language:Japanese   Publisher:Physica Medica  

    Purpose: Gold fiducial markers are used to guide liver stereotactic body radiation therapy (SBRT) and are hard to detect by magnetic resonance imaging (MRI). In this study, the parameters of the three-dimensional T1-weighted turbo gradient-echo (3D T1W-GRE) sequence were optimized for gold marker detection without degrading tumor delineation. Methods: Custom-made phantoms mimicking tumor and normal liver parenchyma were prepared and embedded with a gold marker. The 3D T1W-GRE was scanned by varying echo time (TE), bandwidth (BW), flip angle (FA), and base matrix size. The signal-to-noise ratio (SNR), contrast ratio (CR), and relative standard deviation (RSD) of the signal intensity in the area including the gold marker were evaluated, and the parameters were optimized accordingly. The modified 3D T1W-GRE (called HYBRID) was compared with the conventional T1W-GRE- and T2*-sequences in both phantom and clinical studies. In the clinical study of six patients with primary liver tumors, two observers visually assessed marker detection, tumor delineation, and overall image quality on a four-point scale. Results: In the phantom study, HYBRID showed significantly higher SNR and RSD than those of conventional T1W-GRE (P < 0.001). In the clinical study, HYBRID yielded significantly higher scores than conventional T1W-GRE did in terms of marker detection (P < 0.001). The scores of both sequences were not statistically different in terms of tumor delineation and overall image quality (P = 0.56 and P = 0.32). Conclusions: The proposed HYBRID sequence improved gold fiducial marker detection without degrading tumor delineation in MRI for SBRT of primary liver tumor.

    DOI: 10.1016/j.ejmp.2022.01.003

    Web of Science

    Scopus

    PubMed

  4. Evaluation of system-related magnetic resonance imaging geometric distortion in radiation therapy treatment planning: two approaches and effectiveness of three-dimensional distortion correction

    Kato Yutaka, Okudaira Kuniyasu, Kamomae Takeshi, Kumagai Motoki, Nagai Youta, Taoka Toshiaki, Itoh Yoshiyuki, Naganawa Shinji

    NAGOYA JOURNAL OF MEDICAL SCIENCE   Vol. 84 ( 1 ) page: 29 - 41   2022.2

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    Language:Japanese   Publisher:Nagoya Journal of Medical Science  

    We propose two methods to evaluate system-related distortion in magnetic resonance imaging (MRI)in radiation therapy treatment planning (RTP) and demonstrate the importance of three-dimensional (3D)distortion correction (DC) by quantitatively measuring the distortion magnitude. First, a small pin phantomwas scanned at multiple positions using an external laser guide for accurate phantom placement andcombined into one image encompassing a large area. Direct plane images were used for evaluating in-planedistortion and multiplanar reconstruction images for through-plane distortion with no DC, two-dimensional(2D) DC, and 3D DC. Second, a large grid sheet was scanned as the direct plane of the phantom placement.The distortion magnitude was determined by measuring the displacement between the MRI and referencecoordinates. The measured distortions were compared between in and through-plane when applying DCand between the two methods. The small pin phantom method can be used to evaluate a wide range ofdistortions, whereas data from the entire plane can be obtained with a single scan using the grid sheetwithout a laser guide. The mean distortion magnitudes differed between the methods. Furthermore, the 3DDC reduced in and through-plane distortions. In conclusion, the small pin phantom method can be usedto evaluate a wide range of distortions by creating a combined image, whereas the grid sheet methodis simpler, accurate, repeatable, and does not require a special-order phantom or laser guide. As 3D DCreduces both in and through-plane distortions, it can be used to improve RTP quality

    DOI: 10.18999/nagjms.84.1.29

    Web of Science

    Scopus

  5. Influence of implanted metals in new CT reconstruction algorithm for radiotherapy treatment planning

    Kamomae T., Nakaya T., Kawabata F., Okudaira K., Kumagai M., Oguchi H., Itoh Y., Naganawa S.

    RADIOTHERAPY AND ONCOLOGY   Vol. 133   page: S1132 - S1132   2019.4

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    Language:Japanese  

    Web of Science

  6. Effect of patient positioning on carbon-ion therapy planned dose distribution to pancreatic tumors and organs at risk.

    Miki K, Fukahori M, Kumagai M, Yamada S, Mori S

    Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)   Vol. 33   page: 38-46   2017.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.ejmp.2016.12.001

    PubMed

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Presentations 9

  1. 前立腺定位放射線治療における尿道位置のInter-fractional motion

    奥宮真太郎,奥平訓康,伊藤淳二,野口由美子,熊谷始紀,加茂前健,森政樹,阿部真治

    第49回日本放射線技術学会秋季学術大会  2021.10.16  日本放射線技術学会

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    Event date: 2021.10

    Language:Japanese  

    Venue:熊本   Country:Japan  

  2. Deviations in dose distribution due to tracking errors in the treatment of shrunken lung tumors

    Motoki Kumagai, Fumitaka Kawabata, Kazuma Sugita, Toshiki Kato, Kuniyasu Okudaira, Yutaka Kato, Yoshiyuki Itoh, and Shinji Naganawa

    2021.4.16 

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  3. Predictive translation of oblique images into frontal and lateral images using Deep Learning for CyberKnife system

    Kato Toshiki, Kumagai Motoki, Okudaira Kuniyasu, Mori Masaki, Abe Shinji

    2021.4.17 

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  4. Performance Evaluation of Turbo Gradient- and Spin-echo Diffusion-weighted Pulse Sequence with BLADE Trajectory Technique for ADC Values and Susceptibility Distortions: A Phantom Study

    Yutaka Kato, Motoki Kumagai, Kuniyasu Okudaira, Katsuya Maruyama, Toshiaki Taoka, Shinji Naganawa

    2021.4.17 

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    Event date: 2021.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  5. 多発脳転移(2~12)に対する 単一治療計画による包括的一連照射: Iris collimatorを用いたCK-VOLO最適化による PTV内線量勾配調整と治療時間短縮

    大宝 和博, 熊谷 始紀, 高瀬 裕樹, 伊藤 淳二, 大家 祐実, 加茂前 健, 伊藤 善之, 棚橋 邦明, 大岡 史治, 夏目 敦至, 大島 幸彦, 鈴木 耕次郎

    サイバーナイフ研究会 第14回学術研究会 

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  6. Simultaneous irradiation with single planning for Cyberknife-based SRT of 5-10 brain metastases

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    Event date: 2020.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  7. Quantitative evaluation of distortion in magnetic resonance imaging for radiation treatment planning: Characterization of system-related geometric distortion and effectiveness of distortion correction

    Yutaka Kato, Kuniyasu Okudaira, Motoki Kumagai, Toshiaki Taoka, Takeshi Kamomae, Yoshiyuki Itoh, Sinji Naganawa

    European Congress of Radiology (ECR) 2020  

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    Event date: 2020.7

    Language:English   Presentation type:Poster presentation  

    Country:Austria  

  8. Analysis of MRI Machine-Dependent Geometric Distortions in Radiotherapy Treatment Planning

    Kuniyasu Okudaira, Motoki Kumagai, Yutaka Kato, Takeshi Kamomae, Yoshikazu Miyake, Shinji Abe

    The 76th Annual Meeting of the Japanese Society of Radiological Technology  

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    Event date: 2020.5 - 2020.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  9. Novel Evaluation Method for MRI System-related Geometric Distortions in Radiation Therapy Planning

    Youta Nagai, Kuniyasu Okudaira, Yutaka Kato, Motoki Kumagai, Takeshi Kamomae, Yoshikazu Miyake, Shinji Abe

    The 76th Annual Meeting of the Japanese Society of Radiological Technology  

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    Event date: 2020.5 - 2020.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

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