Iraha Yuko

写真a

Researcher Number(JSPS Kakenhi)

50305207
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External Career 【 display / non-display 】

  • 2017.12
    　
    　

    University of the Ryukyus Hospital, associate professor  

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Published Papers 【 display / non-display 】

  • Diffusion lacunae and T2 dark bands in placenta accreta spectrum: MR-pathologic correlation.

    Fujii S, Iraha Y, Ozaki K

    Acta radiologica open   15 ( 2 ) 20584601261427005   2026.02 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Age-related changes in the radiologic findings of lobular endocervical glandular hyperplasia: a multicenter study.

    Ohya A, Fukuzawa T, Himoto Y, Kido A, Tsuboyama T, Kikkawa N, Fukui H, Iraha Y, Ito K, Fujinaga Y

    Japanese journal of radiology ( Japanese Journal of Radiology )  43 ( 6 ) 985 - 994   2025.06 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Limited diagnostic performance of imaging evaluation for staging in gastric-type endocervical adenocarcinoma: a multi-center study

    Himoto, Y; Kido, A; Yamanoi, K; Kurata, Y; Morita, S; Kikkawa, N; Fukui, H; Ohya, A; Iraha, Y; Tsuboyama, T; Ito, K; Fujinaga, Y; Minamiguchi, S; Mandai, M; Nakamoto, Y

    JAPANESE JOURNAL OF RADIOLOGY ( Japanese Journal of Radiology )  43 ( 5 ) 810 - 819   2025.05 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Diffusion lacunae: a novel MR imaging finding on diffusion-weighted imaging for diagnosing placenta accreta spectrum.

    Iraha Y, Fujii S, Tsuchiya N, Azama K, Yonamine E, Mekaru K, Kinjo T, Sekine M, Nishie A

    Japanese journal of radiology ( Japanese Journal of Radiology )  43 ( 2 ) 255 - 265   2024.09 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    OBJECTIVE: To evaluate the usefulness of novel diffusion-weighted imaging (DWI) findings for diagnosing placenta accreta spectrum (PAS). MATERIALS AND METHODS: This retrospective study included 49 pregnant women with suspected PAS who underwent 1.5 T placental MRI. Diffusion lacunae were defined as intraplacental areas showing hypointensity on DWI and hyperintensity on the apparent diffusion coefficient map. Two radiologists evaluated the number and size of placental lacunae on DWI, and flow void in the diffusion lacunae on T2-weighted imaging. The radiologists also evaluated established MRI features of PAS described in the SAR-ESUR consensus statement. Pearson's chi-square test or Mann-Whitney U test was used to compare findings between patients with and without PAS. Interobserver reliability for DWI and established MRI features was also assessed. Optimal thresholds for the number and maximum size of diffusion lacunae for differentiating PAS from the no-PAS group were determined using receiver operating characteristic curve analyses. RESULTS: Eighteen patients were diagnosed with PAS, and 31 patients with placental previa without PAS. The number and maximum size of diffusion lacunae were significantly larger in patients with than in patients without PAS (p < 0.0001). Combining assessment of the number of diffusion lacunae with assessment of their maximum size yielded a diagnostic performance with sensitivity, specificity and accuracy of 83%, 94% and 90%, respectively. Flow voids within the diffusion lacunae had sensitivity, specificity and accuracy of 88%, 84% and 86%, respectively. CONCLUSION: The number and size of diffusion lacunae, and T2 flow void in diffusion lacunae may be useful findings for diagnosing PAS.

  • Diffusion lacunae: a novel MR imaging finding on diffusion-weighted imaging for diagnosing placenta accreta spectrum

    Iraha Yuko, Fujii Shinya, Tsuchiya Nanae, Azama Kimei, Yonamine Eri, Mekaru Keiko, Kinjo Tadatsugu, Sekine Masayuki, Nishie Akihiro

    Japanese Journal of Radiology ( Springer )    1 - 11   2024.09 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    Objective To evaluate the usefulness of novel diffusion-weighted imaging (DWI) findings for diagnosing placenta accreta spectrum (PAS). Materials and methods This retrospective study included 49 pregnant women with suspected PAS who underwent 1.5 T placental MRI. Diffusion lacunae were defined as intraplacental areas showing hypointensity on DWI and hyperintensity on the apparent diffusion coefficient map. Two radiologists evaluated the number and size of placental lacunae on DWI, and flow void in the diffusion lacunae on T2-weighted imaging. The radiologists also evaluated established MRI features of PAS described in the SAR-ESUR consensus statement. Pearson's chi-square test or Mann–Whitney U test was used to compare findings between patients with and without PAS. Interobserver reliability for DWI and established MRI features was also assessed. Optimal thresholds for the number and maximum size of diffusion lacunae for differentiating PAS from the no-PAS group were determined using receiver operating characteristic curve analyses. Results Eighteen patients were diagnosed with PAS, and 31 patients with placental previa without PAS. The number and maximum size of diffusion lacunae were significantly larger in patients with than in patients without PAS (p < 0.0001). Combining assessment of the number of diffusion lacunae with assessment of their maximum size yielded a diagnostic performance with sensitivity, specificity and accuracy of 83%, 94% and 90%, respectively. Flow voids within the diffusion lacunae had sensitivity, specificity and accuracy of 88%, 84% and 86%, respectively. Conclusion The number and size of diffusion lacunae, and T2 flow void in diffusion lacunae may be useful findings for diagnosing PAS.

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Other Papers 【 display / non-display 】

  • 異所性妊娠のMRI診断

      87 ( 7 ) 771 - 775   2020.07

     

    DOI CiNii Research

  • 選択的動注化学放射線療法により完全寛解しえたRouviereリンパ節転移を伴った上顎洞癌の1例

    山城 啓太, 安座間 喜明, 平安名 常一, 伊良波 裕子, 戸板 孝文, 村山 貞之, 當山 昌那, 安慶名 信也, 真栄田 裕行, 鈴木 幹男

    Japanese Journal of Radiology ( (公社)日本医学放射線学会 )  35 ( Suppl. ) 85 - 85   2017.02

     

  • 頭頸・口腔 頭頸部がんに対する治療戦略 進行副鼻腔癌に対する超選択的動注化学放射線療法の初期治療経験

    平安名 常一, 戸板 孝文, 有賀 拓郎, 前本 均, 安座間 喜明, 伊良波 裕子, 村山 貞之, 真栄田 裕之, 安慶名 信也, 上原 貴行, 山下 懐, 鈴木 幹男

    日本癌治療学会学術集会抄録集 ( (一社)日本癌治療学会 )  54回   WS80 - 6   2016.10

     

  • 進行副鼻腔癌に対する超選択的動注化学放射線療法の初期治療経験

    平安名 常一, 安座間 喜明, 伊良波 裕子, 有賀 拓郎, 前本 均, 橋本 成司, 戸板 孝文, 村山 貞之, 真栄田 裕行, 上原 貴行, 山下 懐, 鈴木 幹男

    IVR: Interventional Radiology ( (一社)日本インターベンショナルラジオロジー学会 )  31 ( Suppl. ) 129 - 129   2016.04

     

  • 選択的動注化学放射線療法により根治を得たRouviereリンパ節転移を伴う上顎洞癌の1例

    山城 啓太, 平安名 常一, 安座間 喜明, 伊良波 裕子, 山城 恒雄, 木下 亮, 戸板 孝文, 當山 昌那, 安慶名 信也, 真栄田 裕行, 鈴木 幹男, 村山 貞之

    癌と化学療法 ( (株)癌と化学療法社 )  43 ( 2 ) 243 - 246   2016.02

     

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Grant-in-Aid for Scientific Research 【 display / non-display 】

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2021.04  -  2025.03 

    Direct: 3,100,000 (YEN)  Overheads: 4,030,000 (YEN)  Total: 930,000 (YEN)

  • Non invasive estimation of renal fibrosis using MRI and texture analysis

    Grant-in-Aid for Scientific Research(C)

    Project Year: 2019.04  -  2022.03 

    Investigator(s): Ishigami Kousei 

    Direct: 3,300,000 (YEN)  Overheads: 4,290,000 (YEN)  Total: 990,000 (YEN)

    　View Summary

    We analyzed the parameters provided by preoperative 18 F-fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT) for prognostic prediction of renal cell carcinoma (RCC).We compared the high and low standardized uptake values (SUV) groups two groups according to recurrence/metastasis to determine prognosis-influencing factors. The SUV of the PET/CT scan were independent predictors of prognosis after adjusting for confounders regardless of the tumor subtypes. We also investigated the potential of stratification of prostate cancer patients into low- and high-grades using multiparametric magnetic resonance (MR) radiomics. The results suggested that the proposed approach with multiparametric MR radiomics in conjunction with 2-dimensional joint histogram computed with dynamic contrast-enhanced images could have the potential to stratify prostate cancer patients into low- and high grades.

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