External Career 【 display / non-display 】

External Career 【 display / non-display 】

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• 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 )    2024.09 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  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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• Direct visualization of postoperative aortobronchial fistula on computed tomography

  Tsuchiya, N; Inafuku, H; Yogi, S; Iraha, Y; Iida, G; Ando, M; Nagano, T; Higa, S; Maeda, T; Kise, Y; Furukawa, K; Yonemoto, K; Nishie, A

  WORLD JOURNAL OF RADIOLOGY   16 ( 8 ) 337 - 347   2024.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• A rare case of cerebral hemorrhage associated with intra-arterial infusion chemotherapy for advanced sphenoid sinus cancer.

  Heianna J, Yamashita Y, Iraha Y, Murayama S

  Journal of cancer research and therapeutics ( Journal of Cancer Research and Therapeutics )  16 ( 3 ) 686 - 689   2020.04 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Central nervous damage related to intra-arterial infusion chemotherapy (IAC) for head and neck cancer reported to date are cerebral infarction, transient ischemic attack, and neuropathy. There have been no reports of cerebral hemorrhage as an IAC-related complication for head and neck cancer. Authors report a case that underwent intra-arterial infusion chemoradiotherapy for advanced sphenoid sinus cancer which extended to the left cavernous sinus and cranium, subsequently suffered cerebral hemorrhage thought to have been caused by IAC. Treatment should be performed with greater caution when the head and neck cancer involves the cavernous sinus or cranium, as in the present case.

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• Uterine artery embolization for postpartum and postabortion hemorrhage: a retrospective analysis of complications, subsequent fertility and pregnancy outcomes.

  Toguchi M, Iraha Y, Ito J, Makino W, Azama K, Heianna J, Ganaha F, Aoki Y, Murayama S

  Japanese journal of radiology ( Japanese Journal of Radiology )  38 ( 3 ) 240 - 247   2019.12 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  PURPOSE: To evaluate the impact of UAE for postpartum and postabortion hemorrhage on future infertility, especially in patients undergoing infertility treatment, along with angiographic endpoints. MATERIALS AND METHODS: Sixty-two sessions performed emergent or prophylactic UAE for postpartum or postabortion hemorrhage between 2008 and 2017 were selected. Subsequent pregnancy outcomes and complications were investigated as primary outcomes. The cases were divided into two groups based on the presence of massive hemorrhage. The relationships between angiographic endpoints and complications were also evaluated as secondary outcomes. RESULTS: The mean patient age was 34.1 ± 6.5 years. Fourteen of the 23 patients (60.9%) with desired fertility achieved pregnancy and 10 patients achieved live births (43.5%). In the patients during infertility treatment, three of the four patients had complications of severe adhesion after caesarean section or placenta accreta. In the group of patients with massive hemorrhage, the occurrence of uterine infection was significantly high (p = 0.014), but the angiographic endpoints were not significant, regardless of the occurrence of uterine infection. CONCLUSION: It was unnecessary to modify embolic endpoint according to seriousness of the hemorrhage. The pregnancy and live birth rates were acceptable, although patients undergoing infertility treatment had a higher rate of delivery complications.

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• Concomitant radiotherapy and transarterial chemoembolization reduce skeletal-related events related to bone metastases from renal cell carcinoma.

  Heianna J, Makino W, Ariga T, Ishikawa K, Kusada T, Maemoto H, Toguchi M, Ito J, Goya M, Miyazato M, Iraha Y, Murayama S

  European radiology ( European Radiology )    2019.11

  Type of publication: Research paper (scientific journal)

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Other Papers 【 display / non-display 】

Other Papers 【 display / non-display 】

• 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

   

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

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)

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  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.