KAWANO Masatsugu

写真a

Affiliation

Faculty of Medicine College Hospital Department of radiology

Title

Assistant Professor

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Papers 【 display / non-display 】

  • Differentiation of Solitary Pulmonary Nodules from Benign to Malignant Using Non-contrast Dual Energy CT Electron Density Values Reviewed

    Kawano Masatsugu, Fujisaki Ryohei, Shirieda Katsutoshi, Matsui Takehiro, Komi Masanori, Sato Yuichiro, Maeda Ryo, Kuga Noriyuki, Yanagi Shigehisa, Azuma Minako, Uchiyama Yoshikazu

    Japanese Journal of Radiological Technology   81 ( 10 )   n/a   2025

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Radiological Technology  

    <i>Purpose</i>: The development of dual energy CT (DECT) has made it possible to provide not only morphological characteristics but also a wide range of quantitative information. The purpose of this study is to differentiate between benign and malignant solitary pulmonary nodules (SPN) by using electron density values obtained from DECT. <i>Methods</i>: From the image data diagnosed as SPN, DECT images of 54 cases were selected, and the maximum electron density values of SPN were obtained. Electron density values were compared between benign and malignant cases by <i>t</i>-test. Comparisons between histopathological types and histological subtypes were performed by ANOVA. Logistic regression analysis was also applied to estimate the partial regression coefficients on electron density values. <i>Results</i>: Electron density values were 3.56×10<sup>20</sup>/mm<sup>3</sup> for malignant and 3.51×10<sup>20</sup>/mm<sup>3</sup> for benign, with malignancy being significantly higher (p<0.001). ROC analysis showed that the AUC was 0.77. In a comparison between histopathologic types, electron density values were significantly higher for adenocarcinoma and squamous cell carcinoma (p<0.05). There were no significant differences among subtypes. Logistic regression analysis showed a regression coefficient of 1.24 (p<0.01). <i>Conclusion</i>: Electron density values obtained from dual energy CT may serve as a useful quantitative parameter for differentiating between benign and malignant SPN. However, attention should be paid to certain histological subtypes, such as invasive mucinous adenocarcinoma, which may exhibit exceptionally low values.

    DOI： 10.6009/jjrt.25-1557

    PubMed

    CiNii Research

  • Detection of acute rib fractures on CT images with convolutional neural networks: effect of location and type of fracture and reader’s experience Reviewed International journal

    Azuma M., Nakada H., Takei M., Nakamura K., Katsuragawa S., Shinkawa N., Terada T., Masuda R., Hattori Y., Ide T., Kimura A., Shimomura M., Kawano M., Matsumura K., Meiri T., Ochiai H., Hirai T.

    Emergency Radiology   29 ( 2 )   317 - 328   2022.4

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Emergency Radiology  

    Purpose: The evaluation of all ribs on thin-slice CT images is time consuming and it can be difficult to accurately assess the location and type of rib fracture in an emergency. The aim of our study was to develop and validate a convolutional neural network (CNN) algorithm for the detection of acute rib fractures on thoracic CT images and to investigate the effect of the CNN algorithm on radiologists’ performance. Methods: The dataset for development of a CNN consisted of 539 thoracic CT scans with 4906 acute rib fractures. A three-dimensional faster region-based CNN was trained and evaluated by using tenfold cross-validation. For an observer performance study to investigate the effect of CNN outputs on radiologists’ performance, 30 thoracic CT scans (28 scans with 90 acute rib fractures and 2 without rib fractures) which were not included in the development dataset were used. Observer performance study involved eight radiologists who evaluated CT images first without and second with CNN outputs. The diagnostic performance was assessed by using figure of merit (FOM) values obtained from the jackknife free-response receiver operating characteristic (JAFROC) analysis. Results: When radiologists used the CNN output for detection of rib fractures, the mean FOM value significantly increased for all readers (0.759 to 0.819, P = 0.0004) and for displaced (0.925 to 0.995, P = 0.0028) and non-displaced fractures (0.678 to 0.732, P = 0.0116). At all rib levels except for the 1st and 12th ribs, the radiologists’ true-positive fraction of the detection became significantly increased by using the CNN outputs. Conclusion: The CNN specialized for the detection of acute rib fractures on CT images can improve the radiologists’ diagnostic performance regardless of the type of fractures and reader’s experience. Further studies are needed to clarify the usefulness of the CNN for the detection of acute rib fractures on CT images in actual clinical practice.

    DOI： 10.1007/s10140-021-02000-6

    Scopus

  • Short-term experience with aspiration embolectomy using a ACE68 reperfusion catheter to treat embolic superior mesenteric artery occlusion Reviewed International journal

    Masatsugu Kawano, Minako Azuma, Yohei Hattori, Ichiro Ikushima, Kengo Kai, Kazuhiro Higuchi, Tomohiro Kawano, Fumitaka Matsumoto, Shunro Uchinokura, Go Irisa, Hajime Ohta, Toshinori Hirai

    Emergency Radiology   28 ( 3 )   675 - 678   2021.6

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    We report the short-term results with aspiration embolectomy using an ACE68 reperfusion catheter to treat patients with acute embolic superior mesenteric artery (SMA) occlusion. Our study included 4 consecutive male patients ranging in age from 72 to 86 years (mean age 79 years). In all patients, the main trunk of the SMA was occluded. The technical success rate was 100% for all procedures. There were no major procedure-related complications. One patient underwent laparotomy with intestinal resection after successful recanalization. No patient reported clinical symptoms of abdominal ischemia at follow-up. Our short-term experience shows that percutaneous aspiration embolectomy using an ACE68 reperfusion catheter is an effective treatment for acute mesenteric ischemia.

    DOI： 10.1007/s10140-020-01896-w

    Scopus

    PubMed

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    Other Link： https://link.springer.com/article/10.1007/s10140-020-01896-w/fulltext.html

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Presentations 【 display / non-display 】

  • 心臓診断について

    川野　真嗣

    第72回九州MRI研究会 

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    Event date： 2023.1.7

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 肺乳頭腺腫の1切除例

    中村　咲和、川野　真嗣、下村　明、中田　博、東　美菜子、前田　亮、綾部　貴典、魏　峻洸

    第195回日本医学放射線学会九州地方会 

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    Event date： 2022.6.18 - 2022.6.19

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 血清CA19-9高値を示した脾嚢胞の1例

    堀之内裕美、新川仁奈子、川野真嗣、榮　建文、福島　剛、今村直哉

    第192回日本医学放射線学会九州地方会  2021.2.7 

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    Event date： 2021.2.7

    Language：Japanese   Presentation type：Oral presentation (general)  

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