KAWANO Masatsugu

写真a

Affiliation

Faculty of Medicine College Hospital Department of radiology

Title

Assistant Professor

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  • 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

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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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