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Faculty of Medicine School of Medicine Department of Medicine of Pathophysiological Diagnosis and Therapy, Radiology |
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AZUMA Minako
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Papers 【 display / non-display 】
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A Follow-up Study of National Survey on Safety Management at MR Imaging Facilities in Japan
AZUMA Minako, DOI Tsukasa, TAKAHASHI Mitsuyuki, HATA Hirofumi, UEYAMA Tsuyoshi, TAKAHASHI Junji, SAKAI Kazuyuki, OYAMA-MANABE Noriko, HATA Junichi, KATAOKA Masako, KURODA Kagayaki, IJICHI Shinpei, AOKI Shigeki, HIRAI Toshinori
Japanese Journal of Magnetic Resonance in Medicine 43 ( 4 ) 144 - 173 2023.11
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society for Magnetic Resonance in Medicine
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Usefulness of Voxel-Based Quantification (VBQ) Smoothing in Relaxation Time Mapping
Fukunaga Kota, Fujiwara Yasuhiro, Enzaki Masahiro, Komi Masanori, Hirai Toshinori, Azuma Minako
Japanese Journal of Radiological Technology 79 ( 9 ) 913 - 922 2023.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Radiological Technology
<i>Purpose</i>: Voxel-based quantification (VBQ) smoothing is a technique used to smooth quantitative parametric maps in the Montreal Neurological Institute standard space. Although VBQ smoothing could suppress changes in quantitative values at tissue boundaries, its effectiveness on relaxation time (T<sub>1</sub> and T<sub>2</sub> values and proton density PD) maps has not been investigated. The purpose of this study was to clarify the usefulness of VBQ smoothing in relaxation time mapping. <i>Method</i>: T<sub>1</sub> and T<sub>2</sub> values and PD maps of the brains of 20 healthy participants were obtained using a two-dimensional multi-dynamic multi-echo sequence. VBQ and Gaussian smoothing were applied to the relaxation time maps by varying the kernel size by 1 mm from 1 to 6 mm. Changes in relaxation time before and after VBQ and Gaussian smoothing for the putamen, caudate nucleus, substantia nigra, and corpus callosum on the relaxation time maps were evaluated. <i>Result</i>: The changes in relaxation time after VBQ smoothing application were smaller than those in that after Gaussian smoothing application. Although the differences in the relaxation time for all tissues before and after VBQ and Gaussian smoothing applications increased with increasing kernel size for all relaxation times for both methods, the changes in the relaxation time for VBQ smoothing were smaller than those in that for Gaussian smoothing. <i>Conclusion</i>: VBQ smoothing can suppress the change in the relaxation time on the boundary of the tissue and is thus a useful smoothing technique in relaxation time mapping.
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Fukunaga Kota, Enzaki Masahiro, Komi Masanori, Azuma Minako, Hirai Toshinori, Fujiwara Yasuhiro
Japanese Journal of Radiological Technology 79 ( 7 ) 663 - 673 2023.7
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Radiological Technology
<i>Purpose</i>: Three-dimensional (3D) quantification using an interleaved Look-Locker acquisition sequence with a T<sub>2</sub> preparation pulse (QALAS) is a quantitative sequence used to measure relaxation times. The accuracy of the relaxation time measurement of 3D-QALAS at 3.0 T and the bias of 3D-QALAS have not yet been assessed. The purpose of this study was to clarify the accuracy of the relaxation time measurements using 3D-QALAS at 3.0 T MRI. <i>Methods</i>: The accuracy of the T<sub>1</sub> and T<sub>2</sub> values for 3D-QALAS was evaluated using a phantom. Subsequently, the T<sub>1</sub> and T<sub>2</sub> values and proton density of the brain parenchyma in healthy subjects were measured using 3D-QALAS and compared with those of 2D multi-dynamic multi-echo (MDME). <i>Results</i>: In the phantom study, the average T<sub>1</sub> value of 3D-QALAS was 8.3% prolonged than that for conventional inversion recovery spin-echo; the average T<sub>2</sub> value for 3D-QALAS was 18.4% shorter than that for multi-echo spin-echo. The in vivo assessment showed that the mean T<sub>1</sub> and T<sub>2</sub> values and PD for 3D-QALAS were prolonged by 5.3%, shortened by 9.6%, and increased by 7.0%, respectively, compared with those for 2D-MDME. <i>Conclusion</i>: Although 3D-QALAS at 3.0 T has high accuracy T<sub>1</sub> value, which is less than 1000 ms, the T<sub>1</sub> value could be overestimated for tissues with it longer than that T<sub>1</sub> value. The T<sub>2</sub> value for 3D-QALAS could be underestimated for tissues with T<sub>2</sub> values, and this tendency increases with longer T<sub>2</sub> values.
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A clear presentation of intracranial hypostasis on PMCT Reviewed
Shinkawa N., Imada M., Azuma M., Shinkawa N., Yukawa N.
Journal of Forensic and Legal Medicine 97 102540 2023.7
Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Forensic and Legal Medicine
Intracranial hypostasis is a common postmortem change evident on postmortem CT (PMCT), but can be readily misinterpreted as subdural hematoma by inexperienced physicians. Although PMCT is necessarily lacking contrast enhancement, we reconstructed hypostatic sinuses into three-dimensional images resembling the results of in vivo venography. This simple methodology facilitates easy recognition of intracranial hypostasis.
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Brain structural changes in patients with chronic methylmercury poisoning in Minamata. Reviewed
Hirai T, Abe O, Nakamura M, Inui S, Uetani H, Ueda M, Azuma M
Brain research 1805 148278 2023.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Brain Research
Exploratory whole-brain studies in patients suffering from methylmercury (MeHg) poisoning have not been conducted. We aimed to evaluate the neuroanatomical differences between patients with chronic MeHg poisoning and healthy volunteers via magnetic resonance (MR) imaging. Patients included in this case-control study were divided into three categories based on whether MeHg exposure occurred in utero, under 15 years of age, or over 15 years of age, as fetal-, pediatric-, and adult-type patients, respectively. This study analyzed MR imaging data from 10 patients each of fetal, pediatric, and adult types of chronic MeHg poisoning in Minamata and corresponding 53, 37, and 15 age- and sex-matched healthy volunteers. Whole-brain voxel-based morphometry (VBM) analysis was used to determine the volumetric gray and white matter (GM and WM) differences in patients with chronic MeHg poisoning. Compared to healthy individuals, VBM revealed a significant reduction in GM in the cerebellar and calcarine areas in pediatric- and adult-type cases and in the thalamus of fetal-type cases. A significant reduction in WM volume was also noted in the cerebral and the cerebellar regions, especially in pediatric-type cases. Patients with chronic MeHg poisoning develop structural differences in the GM of the calcarine, the cerebellum, and the thalamus and in the WM of the cerebrum and cerebellum. These changes can appear, depending on the timing of MeHg exposure.
Books 【 display / non-display 】
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宮崎県小児科医会会報
東 美菜子（ Role： Joint author , 【特別講演Ⅰ】画像診断における最近の話題）
宮崎県小児科医会 2023.3
Language：Japanese
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特集 ビギナーのための頭部画像診断 -Q＆Aアプローチ- 2023 所見別 小脳橋角部腫瘤はどのように考えればよいですか?
東 美菜子（ Role： Joint author）
学研メディカル秀潤社 2022.12
Language：Japanese Book type：Scholarly book
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臨床画像 2022年9月号
東 美菜子（ Role： Joint author , 特集 1 絶対苦手分野にしない 頭蓋底周辺の画像診断）
株式会社メジカルビュー社 2022.9
Language：Japanese Book type：Scholarly book
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日州医事 No.877
東 美菜子（ Role： Joint author , 画像診断とAI）
宮崎県医師会 2022.9
Language：Japanese Book type：Scholarly book
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月刊インナービジョン2022年9月号
東 美菜子（ Role： Joint author , Step up MRI 2022 MRI研究の最新動向&領域別MRI技術の臨床応用とトピックス）
インナービジョン 2022.9
Language：Japanese Book type：Scholarly book
MISC 【 display / non-display 】
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整形トピックス CTにおける肋骨骨折自動検出
東 美菜子
整形外科 74 ( 10 ) 1080 - 1080 2023.9
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：南江堂
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特集 唾液腺･甲状腺をきわめる 顎下腺･舌下腺のCT･MRI -コンパクトな大唾液腺を診断する-
東 美菜子, 今田 真希
画像診断 43 ( 6 ) 526 - 535 2023.4
Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：学研メディカル秀潤社
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特集1 絶対苦手分野にしない 頭蓋底周辺の画像診断 良性腫瘍
東 美菜子
臨床画像 38 ( 9 ) 988 - 1001 2022.9
Publishing type：Rapid communication, short report, research note, etc. (scientific journal) Publisher：メジカルビュー社
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特集1 絶対苦手分野にしない 頭蓋底周辺の画像診断 序説
東 美菜子
臨床画像 38 ( 9 ) 977 - 977 2022.9
Publishing type：Rapid communication, short report, research note, etc. (scientific journal) Publisher：メジカルビュー社
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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 ) 425 2022.4
Language：English Publishing type：Rapid communication, short report, research note, etc. (scientific journal) Publisher：Emergency Radiology
Presentations 【 display / non-display 】
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腹腔動脈瘤切除術後のバイパス吻合部に形成された仮性動脈瘤に対しcovered-stentを用いて治療を行った1例
原 卓也、古小路 英二、増田 梨絵、榮 建文、東 美菜子
第44回九州IVR研究会
Event date： 2022.12.17
Language：Japanese Presentation type：Oral presentation (general)
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神経眼科疾患の画像診断
東 美菜子
第24回北海道NR懇話会
Event date： 2022.12.10
Language：Japanese Presentation type：Oral presentation (invited, special)
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脳神経の画像診断
東 美菜子
第342回関西NR勉強会学術講演会
Event date： 2022.11.19
Language：Japanese Presentation type：Oral presentation (invited, special)
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頭蓋底周辺の画像診断
東 美菜子
第50回三重総合画像研究会
Event date： 2022.11.18
Language：Japanese Presentation type：Oral presentation (invited, special)
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QSMの臨床的有用性の検討
東 美菜子
令和4年度熊本大学放射線科MRI研究会
Event date： 2022.11.7
Language：Japanese Presentation type：Oral presentation (invited, special)
Awards 【 display / non-display 】
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Certificate of Merit
2021.12 Radiological Society of North America Contrast-enhanced 3D T2-FLAIR Imaging Of The Brain: What Should Radiologists Know?
Minako Azuma, Yoshihito Kadota, Toshinori Hirai
Award type：Award from international society, conference, symposium, etc.
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加藤賞
2021.2 日本神経放射線学会 Characterization of Carotid Plaque Components by Quantitative Susceptibility Mapping
M.Azuma, K.Maekawa, A.Yamashita, K.Yokogami, M.Enzaki, Z.A.Khant, H.Takeshima, Y.Asada, Y.Wang, T.Hirai
Award type：Award from Japanese society, conference, symposium, etc.
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Certificate of Merit
2020.7 European Congress of Radiology Detectability of renal cell carcinoma on CT in Japanese patients by using an AI algorithm with US patient data
M.Azuma, N.Terada, S.Mukai, D.-A.Bunu, T.Okada, T.Kamoto, K.Araki, T.Hirai
Award type：Award from international society, conference, symposium, etc.
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最優秀会長賞
2020.6 日本医学放射線学会 Prevalence of sellar spine in patients with central precocious puberty
Minako Azuma
Award type：Award from Japanese society, conference, symposium, etc.
Grant-in-Aid for Scientific Research 【 display / non-display 】
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神経変性疾患に対する定量的磁化率マッピングの有用性の検討
Grant number：16K19835 2016.04 - 2019.03
科学研究費補助金 若手研究(B)
Authorship：Principal investigator