Updated on 2023/02/05

写真a

 
YAGI Takuya
 
Organization
University Medical and Dental Hospital Diagnostic Radiology Assistant Professor
Title
Assistant Professor
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Degree

  • 博士(医学) ( 2018.3   新潟大学 )

Research History

  • Niigata University   University Medical and Dental Hospital Diagnostic Radiology   Assistant Professor

    2019.7

  • Niigata University   University Medical and Dental Hospital Diagnostic Radiology   Specially Appointed Assistant Professor

    2018.4 - 2019.6

 

Papers

  • Quantitative 3D Shape Analysis of CT Images of Thymoma: A Comparison With Histological Types

    Motohiko Yamazaki, Kanako Oyanagi, Hajime Umezu, Takuya Yagi, Hiroyuki Ishikawa, Norihiko Yoshimura, Hidefumi Aoyama

    American Journal of Roentgenology   214 ( 2 )   341 - 347   2020.2

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    Publishing type:Research paper (scientific journal)   Publisher:American Roentgen Ray Society  

    DOI: 10.2214/ajr.19.21844

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  • HRCT texture analysis for pure or part-solid ground-glass nodules: distinguishability of adenocarcinoma in situ or minimally invasive adenocarcinoma from invasive adenocarcinoma.

    Takuya Yagi, Motohiko Yamazaki, Riuko Ohashi, Rei Ogawa, Hiroyuki Ishikawa, Norihiko Yoshimura, Masanori Tsuchida, Yoichi Ajioka, Hidefumi Aoyama

    Japanese journal of radiology   36 ( 2 )   113 - 121   2018.2

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

    PURPOSE: To distinguish between adenocarcinoma in situ (AIS)-minimally invasive adenocarcinoma (MIA) and invasive adenocarcinoma (IAC) showing pure or part-solid ground-glass nodules (GGNs) by high-resolution computed tomography (HRCT) texture analysis. MATERIALS AND METHODS: This retrospective study included 101 consecutive patients with 115 pure or part-solid GGNs ≤ 3 cm diameter, which were surgically resected and pathologically diagnosed with AIS, MIA, or IAC (48 AIS-MIA and 67 IAC) between April 2011 and March 2015. Each tumor was manually segmented on axial CT images, and the following texture features were calculated: volume, mass, mean CT value, variance, skewness, kurtosis, entropy, uniformity, and percentile CT numbers (10th, 25th, 50th, 75th, 90th, 95th percentiles). The differences between AIS-MIA and IAC were statistically evaluated using univariate, multivariate, and receiver operating characteristic analysis. RESULTS: Compared with IAC, AIS-MIA had significantly greater skewness, kurtosis, and uniformity, whereas in the other parameters, AIS-MIA demonstrated significantly lower values than those of IAC. Multivariate analysis revealed that independent differentiators were the 90th percentile CT numbers (P < 0.001) and entropy (P = 0.005) with an excellent accuracy (area under the curve, 0.90). CONCLUSIONS: The 90th percentile CT numbers and entropy can accurately distinguish AIS-MIA from IAC.

    DOI: 10.1007/s11604-017-0711-2

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  • 肺動脈塞栓として初期治療を受け、18F FDG-PET/CTで鑑別できた肺動脈肉腫の1例

    山田 美佳, 佐藤 卓, 石川 浩志, 堀井 陽祐, 八木 琢也, 山崎 元彦, 塩谷 基, 吉村 宣彦, 青山 英史, 佐藤 征二郎, 小池 輝元, 土田 正則, 名村 理, 大橋 瑠子, 梅津 哉

    Japanese Journal of Radiology   36 ( Suppl. )   7 - 7   2018.2

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    Language:Japanese   Publisher:(公社)日本医学放射線学会  

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  • Coronary computed tomography angiography using 128-slice dual-source computed tomography in patients with severe calcification.

    Suguru Sato, Yosuke Horii, Norihiko Yoshimura, Takuya Yagi, Hidefumi Aoyama

    Japanese journal of radiology   35 ( 8 )   432 - 439   2017.8

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

    PURPOSE: To compare coronary computed tomography angiography (CTA) and coronary angiography (CAG) with regard to luminal graphic definition of calcified segments using 128-slice dual-source computed tomography (DSCT), specifically for patients with an Agatston score >400. MATERIALS AND METHODS: Of 1148 consecutive patients who underwent coronary CTA using a 128-slice DSCT, 132 subjects had severe calcification with an Agatston score >400. Thirty-nine of the 132 patients who had undergone CAG within 3 months before or after coronary CTA were included. We investigated the distribution of calcification, and we visually evaluated significant stenosis in the calcified and all segments. Results were compared with CAG. RESULTS: The target group in this study had a very high mean Agatston score of 1771 ± 1724. Results for sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of 247 calcified vs all 325 segments were as follows: sensitivity 93.2 vs 92.2%, specificity 83.9 vs 87.5%, PPV 70.8 vs 69.6%, and NPV 96.7 vs 97.3%, respectively. CONCLUSION: 128-slice DSCT has potential for evaluation of calcified segments in the lumen, even in patients whose Agatston score exceeds 400.

    DOI: 10.1007/s11604-017-0650-y

    PubMed

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