Akita, Hirotaka

写真a

Affiliation

School of Medicine, Department of Radiology (Diagnostic Radiology) (Shinanomachi)

Position

Assistant Professor/Senior Assistant Professor
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Books 【 Display / hide 】

  • 泌尿器領域画像診断の勘ドコロＮＥＯ

    秋田大宇, 陣崎雅弘, メジカルビュー社, 2021

    Contact page： 4-19

  • 腎癌取扱い規約第5版

    メディカルレビュー社, 2020.12

  • 画像診断別冊 KEY BOOKシリーズ 知っておきたい泌尿器のCT・MRI 改訂第2版

    秋田大宇, 陣崎雅弘　他, 秀潤社, 2019

    Contact page： 82-83, 88-89, 96-97, 160-161, 304-305, 608-609

  • 最新Body CT診断

    秋田大宇、陣崎雅弘, メディカル・サイエンス・インターナショナル, 2018

    Contact page： 263-292

  • 腹部のCT 第3版

    Akita Hirotaka, メディカル・サイエンス・インターナショナル, 2017.04

    Contact page： 453-612

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Papers 【 Display / hide 】

  • Clinical utility of the Vesical Imaging-Reporting and Data System for muscle-invasive bladder cancer between radiologists and urologists based on multiparametric MRI including 3D FSE T2-weighted acquisitions

    Arita Y., Shigeta K., Akita H., Suzuki T., Kufukihara R., Kwee T.C., Ishii R., Mikami S., Okuda S., Kikuchi E., Oya M., Jinzaki M.

    European Radiology (European Radiology)  31 ( 2 ) 875 - 883 2021.02

    Joint Work,  ISSN  09387994

    　View Summary

    Objectives: To investigate the clinical utility of the Vesical Imaging-Reporting and Data System (VI-RADS) by comparing its diagnostic performance for muscle-invasive bladder cancer (MIBC) between radiologists and urologists based on multiparametric MRI, including three-dimensional (3D) fast spin-echo (FSE) T2-weighted acquisitions. Methods: This study included 66 treatment-naïve patients (60 men, 6 women; mean age 74.0 years) with pathologically proven bladder cancer who underwent multiparametric MRI, including 3D FSE T2-weighted imaging, before transurethral bladder tumour resection between January 2010 and November 2018. The MRI scans were categorised according to the five-point VI-RADS score by four independent readers (two board-certified radiologists and board-certified urologists each), blinded to the histopathological findings. The VI-RADS scores were compared with the postoperative histopathological diagnosis. Interobserver agreement was assessed using weighted kappa coefficients. ROC analysis and generalised estimating equations were used to evaluate the diagnostic performance. Results: Forty-nine (74.2%) and 17 (25.8%) tumours were confirmed to be non-MIBC and MIBC, respectively, based on pathological examination. The interobserver agreement was good-to-excellent between all pairs of readers (range, 0.73–0.91). The urologists’ sensitivity/specificity values for DCE-MRI VI-RADS scores were significantly lower than those of radiologists. No significant differences were observed for the overall VI-RADS score. The AUC for the overall VI-RADS score was 0.94, 0.92, 0.89, and 0.87 for radiologists 1 and 2 and urologists 1 and 2, respectively. Conclusions: The VI-RADS score, based on multiparametric MRI including 3D FSE T2-weighted acquisitions, can be useful for radiologists and urologists to determine the bladder cancer muscle invasion status preoperatively. Key Points: • VI-RADS (using multiparametric MRI including 3D FSE T2-weighted acquisitions) achieves good to excellent interobserver agreement and has similar diagnostic performance for detecting muscle invasion by both radiologists and urologists. • The diagnostic performance of the overall VI-RADS score is high for both radiologists and urologists, particularly due to the dominant effect of diffusion-weighted imaging on the overall VI-RADS score. • The sensitivity and specificity values of the T2WI VI-RADS scores for four readers in our study (using 3D FSE T2-weighted acquisitions) were similar (with slightly higher specificity values) to previously published results (using 2D FSE T2-weighted acquisitions).

  • Radiologic features of mixed epithelial and stromal tumors of the kidney: Hyperattenuating on unenhanced computed tomography and T2-hypointensity on magnetic resonance imaging

    Suzuki T, Akita H, Arita Y, Tomiyama A, T, Hashimoto M, Okuda S, Mikami, Mizuno R, Oya M, Jinzaki M

    Radiology Case Reports 16   858 - 862 2021

    Research paper (scientific journal), Joint Work, Accepted

  • Incidentally detected microcystic serous cystadenoma of the pancreas with splenic invasion: a case report and literature review

    Yagi F, Akita H, Ueno A, Takano K, Masugi Y, Sakamoto M, Kitago M, Shinoda M, Kitagawa Y, Toyama K, Matsusaka Y, Yashiro H, Okuda S, Jinzaki M

    BJR case reports 6 ( 2 ) 20190109 2020

    Research paper (scientific journal), Joint Work, Accepted

  • A case of inguinal cellular angiofibroma

    Kamitani R, Matsumoto K, Fujiwara S, Akita H, Mikami S, Kameyama K, Jinzaki M, Oya M

    IJU Case Reports 3   69 - 71 2020

    Research paper (scientific journal), Joint Work, Accepted

  • Usefulness of contrast-enhanced ultrasonography for diagnosis of renal cell carcinoma in dialysis patients: Comparison with computed tomography

    Hashimoto M., Ohkuma K., Akita H., Yamada Y., Nakatsuka S., Mizuno R., Oya M., Jinzaki M.

    Medicine (Medicine)  98 ( 47 )  2019.11

    ISSN  00257974

    　View Summary

    AIMS: To investigate the usefulness of contrast-enhanced ultrasonography for diagnosing renal cell carcinoma (RCC) in dialysis patients. MATERIAL AND METHODS: Of 1301 dialysis patients who underwent abdominal computed tomography (CT) between January 2012 and March 2017, 19 were suspected to have solid renal lesions; of these patients, 18 gave consent for and underwent contrast-enhanced ultrasonography with perflubutane in addition to CT; 13 underwent dynamic contrast-enhanced CT, and 5, who could not be administered iodinated contrast media, underwent unenhanced CT. The final diagnoses were based on histopathological findings or the presence/absence of enlargement of the lesion during follow-up. RESULTS: Of the 19 lesions in 18 patients, 14 were diagnosed as RCC and 5 as benign cysts. CT facilitated accurate diagnosis in 10/19 lesions (52.6%) with obvious enhancement (≥20 Hounsfield units [HU]), while definitive diagnosis by CT was difficult in 9 lesions: 2 lesions showed ambiguous enhancement (10-20 HU), 1 lesion was an inflammatory cyst with obvious enhancement, and 6 lesions were assessed by unenhanced CT. Compared with CT, contrast-enhanced ultrasonography allowed more accurate diagnosis (McNemar test, P = .02) in 17/19 lesions (89.5%, 14 RCC and 3 cysts; including all lesions assessed by unenhanced CT and 2 with ambiguous enhancement on CT), with 1 false-positive (inflammatory cyst with hyper-enhancement) and 1 false-negative result due to deep location of the lesion. CONCLUSIONS: Contrast-enhanced ultrasonography was useful for the diagnosis of RCC in dialysis patients with suspected solid renal lesions especially when contrast enhancement was not obvious on CT or contrast-enhanced CT could not be performed.

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Reviews, Commentaries, etc. 【 Display / hide 】

  • 【押さえておくべき注目の疾患2021】泌尿生殖器 3 内反性尿路上皮乳頭腫

    秋田大宇, 陣崎雅弘

    画像診断 41   468 - 469 2021

    Joint Work

  • 【画像診断における脂肪の意味:存在からその意義まで】泌尿器疾患

    秋田大宇、若井理可子、陣崎雅弘

    臨床画像 36   266 - 279 2020

    Joint Work

  • 【CT, MRIどっちを依頼？】5. 超音波検査で腎に腫瘤を疑われた

    秋田大宇、陣崎雅弘

    日本医師会雑誌 149   894 - 895 2020

    Joint Work

  • 【腎・泌尿器の画像診断update】腎腫瘍の画像診断

    秋田大宇、池田織人、若井理可子、陣崎雅弘

    画像診断 40   565 - 576 2020

    Joint Work

  • 動静脈の石灰化の鑑別

    秋田大宇、中尾千恵、陣崎雅弘

    画像診断 39   190 - 193 2019

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Presentations 【 Display / hide 】

  • 透析腎癌の画像診断

    秋田大宇, 橋本正弘, 陣崎雅弘

    第40回日本画像医学会, 

    2021.02
    , 

    Symposium, workshop panel (nominated)

  • CT urography再入門

    秋田大宇

    第39回日本画像医学会, 

    2020.02
    , 

    Oral presentation (invited, special)

  • 腎腫瘍の画像診断－典型例と非典型例－

    秋田大宇

    第456回日本医学放射線学会関東地方会定期大会, 

    2019.12
    , 

    Oral presentation (invited, special)

  • 稀な組織型の腎細胞癌の画像所見

    秋田大宇、陣崎雅弘、大家基嗣

    日本泌尿器腫瘍学会第5回学術集会, 

    2019.10
    , 

    Oral presentation (invited, special)

  • 腎・上部尿路腫瘍の画像診断のアップデート　～造影CT、CTU、MRIを中心に～

    秋田大宇、菊地栄次、大家基嗣、陣崎雅弘

    第7回泌尿器画像診断・治療技術研究会, 

    2019.09
    , 

    Oral presentation (invited, special)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • 腎腫瘤に対する造影超音波検査の有用性の検討－従来の診断学の課題克服を目指して－

    2015.04
    -
    2019.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Principal investigator

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Awards 【 Display / hide 】

  • Certificate of Merit, 5th Asian Congress of Abdominal Radiology

    2015, Retroperitoneal low-flow vascular malformations: characteristic MRI findings correlated with histopathological findings

    Type of Award： International academic award (Japan or overseas)

  • 第27回腹部放射線研究会　イメージインタープリテーション　第3位　

    2013

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 第26回腹部放射線研究会　イメージインタープリテーション　第1位

    2012

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 第70回日本医学放射線学会総会　イメージインタープリテーション　第3位　

    2011

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 第23回腹部放射線研究会　打田賞

    2009, 腎のAngiomyolipoma with epithelial cystsの一例

    Type of Award： Award from Japanese society, conference, symposium, etc.

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Courses Taught 【 Display / hide 】

  • 骨盤臓器

    2021, Full academic year, Laboratory work/practical work/exercise, Within own ｆaculty

  • 泌尿器

    2021, Full academic year, Laboratory work/practical work/exercise, Within own ｆaculty

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Courses Previously Taught 【 Display / hide 】

  • 骨盤臓器

    医学部

    2020.04
    -
    2021.03
    , 

    Full academic year, Laboratory work/practical work/exercise

  • 泌尿器

    医学部

    2020.04
    -
    2021.03
    , 

    Full academic year, Laboratory work/practical work/exercise

  • 骨盤臓器

    医学部

    2019.04
    -
    2020.03
    , 

    Full academic year, Laboratory work/practical work/exercise

  • 泌尿器

    医学部

    2019.04
    -
    2020.03
    , 

    Full academic year, Laboratory work/practical work/exercise

  • 泌尿器

    医学部

    2018.04
    -
    2019.03
    , 

    Full academic year, Laboratory work/practical work/exercise

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