Yamada Sachiko 山田幸子

… Alternative Names

山田幸子ヤマダサチコ

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Researcher Number	40623054
Other IDs
Affiliation (Current)	2025: 大阪大学, 医学部附属病院, 診療放射線技師
Affiliation (based on the past Project Information) *help	2019 – 2023: 大阪大学, 医学部附属病院, 診療放射線技師 2015 – 2017: 大阪大学, 医学部附属病院, 診療放射線技師 2013 – 2016: 大阪大学, 医学部附属病院, 医療技術職員
Review Section/Research Field	Principal Investigator Basic Section 52040:Radiological sciences-related / Epidemiology and preventive medicine Except Principal Investigator Basic Section 52040:Radiological sciences-related / Social systems engineering/Safety system
Keywords	Principal Investigator 画質評価 / dual-energy / CT / 周波数解析 / 信号ノイズ比 / 磁気共鳴 / ノイズ / SNR / MR / ヨード造影剤 … More / 仮想非造影画像 / 線量分布計算 / 医学物理学 / 電子密度 / 視覚心理学 / CT値 / 放射線治療 / 線量分布 / 撮影技術 / 仮想非造影 / 放射線治療計画 / 逐次近似再構成 / dual-energy CT / 検診 / PET/CT / 放射線医学 / 仮想単色CT / PET/SPECT / 減弱補正 / SPECT / PET / 画質 / 画像再構成 / 核医学 / 被ばく … More Except Principal Investigator 安全性 / RF磁場 / 画質 / 画質評価 / 超高磁場 / MRI / SAR / RF波 / パラレル送信 / 高解像度 / 高磁場MR / 画像診断 / 7T MRI / MR / 脳機能計測 / 脳活動 / 定量性 / 脳機能 / 定量評価 / 脳 / ファントム / 断層画像 / 品質管理 / 撮像技術 / 磁気共鳴 Less

臨床MR画像に対するSNR評価の新機軸：すべての撮像法に適用可能な統一的解析法の樹立Principal Investigator
- Principal Investigator
  
  山田幸子
- Project Period (FY)
  2023 – 2025
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 52040:Radiological sciences-related
- Research Institution
  Osaka University
超高磁場MRI：多素子並列RF励起技術の安全性確立と局所超高分解能撮像への展開
- Principal Investigator
  
  上口貴志
- Project Period (FY)
  2019 – 2024
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 52040:Radiological sciences-related
- Research Institution
  National Institute of Information and Communications Technology
A novel radiotherapy treatment planning based on dual-energy virtual monochromatic CTPrincipal Investigator
- Principal Investigator
  
  山田幸子
- Project Period (FY)
  2019 – 2024
- Research Category
  
  Grant-in-Aid for Early-Career Scientists
- Review Section
  
  Basic Section 52040:Radiological sciences-related
- Research Institution
  Osaka University
Establishment of highly-optimized imaging techniques and quality control procedures for ultrahigh-field MRI
- Principal Investigator
  
  Ueguchi Takashi
- Project Period (FY)
  2014 – 2017
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Social systems engineering/Safety system
- Research Institution
  National Institute of Information and Communications Technology
Studies of fundamental CT techniques for very low dose PET/CTPrincipal Investigator
- Principal Investigator
  
  Yamada Sachiko
- Project Period (FY)
  2013 – 2016
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Epidemiology and preventive medicine
- Research Institution
  Osaka University

All 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 Other

All Journal Article Presentation

[Journal Article] Accuracy of Dual-Energy Virtual Monochromatic CT Numbers: Comparison between the Single-Source Projection-Based and Dual-Source Image-Based Methods2018
- Author(s)
  Ueguchi T, Ogihara R, Yamada S
- Journal Title
  
  Academic Radiology
  
  Volume: 印刷中 Issue: 12 Pages: 1632-1639
- DOI
  10.1016/j.acra.2018.02.022
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-26350471
[Journal Article] Dual-energy virtual monochromatic computed tomography for improved attenuation correction in single-photon emission computed tomography in the presence of dense materials2015
- Author(s)
  Yamada S, Ueguchi T, Shimosegawa E, Fujino K, Shimazu T, Murase K, Hatazawa J
- Journal Title
  
  Open J Med Imaging
  
  Volume: 5 Issue: 04 Pages: 183-193
- DOI
  10.4236/ojmi.2015.54023
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-25460751, KAKENHI-PROJECT-26350471
[Journal Article] Radiotherapy treatment planning with contrast-enhanced computed tomography: feasibility of dual-energy virtual unenhanced imaging for improved dose calculations2014
- Author(s)
  Yamada S, Ueguchi T, Ogata T, Mizuno H, Ogihara R, Koizumi M, Shimazu T, Murase K, Ogawa K
- Journal Title
  
  Radiation Oncology
  
  Volume: 9 Issue: 1
- DOI
  10.1186/1748-717x-9-168
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Inversion recovery (IR) spin-echo (SE) T1 measurements with flip angle-independent signal model: Robustness to repetition time (TR) setting2023
- Author(s)
  Ueguchi T, Nishiyama D, Shimada Y, Haji T, Yamada S
- Organizer
  The 79th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K08244
[Presentation] Robustness of inversion recovery (IR) spin-echo (SE) T1 measurements to RF field inhomogeneities2023
- Author(s)
  Yamada S, Nishiyama D, Ueguchi T
- Organizer
  The 79th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] Inversion recovery (IR) spin-echo (SE) T1 measurements with flip angle-independent signal model: Robustness to repetition time (TR) settings2023
- Author(s)
  Ueguchi T, NIshiyama D,Yamada S
- Organizer
  The 79th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] Inversion recovery (IR) spin-echo (SE) T1 measurements with flip angle-independent signal model: Robustness to repetition time (TR) settings.2023
- Author(s)
  Ueguchi T, Nishiyama D, Yamada S
- Organizer
  The 79th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-23K07132
[Presentation] Robustness of inversion recovery (IR) spin-echo (SE) T1 measurements to RF field inhomogeneities.2023
- Author(s)
  Yamada S, Nishiyama D, Ueguchi T
- Organizer
  The 79th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-23K07132
[Presentation] Robustness of inversion recovery (IR) spin-echo (SE) T1 measurements to RF field inhomogeneities2023
- Author(s)
  Yamada S, Nishiyama D, Ueguchi T
- Organizer
  The 79th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K08244
[Presentation] Dependency of apparent diffusion coefficient values on RF field strength in diffusion MRI2022
- Author(s)
  Ueguchi T, Nishiyama D, Shimada Y, Haji T, Yamada S
- Organizer
  The 78th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] Dependency of apparent diffusion coefficient values on RF field strength in diffusion MRI2022
- Author(s)
  Ueguchi T, Nishiyama D, Shimada Y, Haji T, Yamada S
- Organizer
  The 78th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K08244
[Presentation] 拡散MRIにおける不十分なSNR条件下でのADCの過小評価：シミュレーションによる包括的理解2022
- Author(s)
  山田幸子，西山大輔，島田育廣，土師知己，上口貴志
- Organizer
  日本磁気共鳴医学会第50回大会
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] 画像再構成法の違いがもたらすCT画像の質感差：構造類似性指標による視覚的画質定量のロバストネス評価2022
- Author(s)
  山田幸子
- Organizer
  日本放射線技術学会中部支部CT研究会
- Invited
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] Reconstruction algorithm-dependent texture differences in CT images: The robustness of structural similarity (SSIM) index as a perceptual image quality metric2022
- Author(s)
  Yamada S, Ueguchi T
- Organizer
  The 78th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K08244
[Presentation] Reconstruction algorithm-dependent texture differences in CT images: The robustness of structural similarity (SSIM) index as a perceptual image quality metric2022
- Author(s)
  Yamada S, Ueguchi T
- Organizer
  The 78th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] Quantitative assessment of texture differences in CT Images using correlation coefficients: The significance of dynamic range conversion in consideration of observation conditions.2021
- Author(s)
  Yamada S, Ueguchi T
- Organizer
  The 77th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K08244
[Presentation] Quantitative Assessment of Texture Differences in CT Images Using Correlation Coefficients: The Significance of Dynamic Range Conversion in Consideration of Observation Conditions.2021
- Author(s)
  Yamada S, Ueguchi T
- Organizer
  The 77th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] 画像再構成法の違いがもたらすCT画像の「質感差」の定量評価2021
- Author(s)
  山田幸子，上口貴志
- Organizer
  日本医用画像情報学会年次（第190回）大会
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] Correlation Coefficients as a Simple, Robust, and Perceptual Image Quality Metric for CT Images with Different Reconstruction Algorithms2020
- Author(s)
  Yamada S, Ueguchi T
- Organizer
  The 76th Annual Meeting of the Japan Society of Radiological Technology
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] 前立腺IMRT照射時における直腸形状の定量解析2020
- Author(s)
  吉原奈菜華，深尾真理，橋渡貴司，山田幸子，有村武浩，井ノ上信一，隅田伊織
- Organizer
  日本放射線技術学会第76回総会学術大会
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] Correlation Coefficients as a Simple, Robust, and Perceptual Image Quality Metric for CT Images with Different Reconstruction Algorithms2020
- Author(s)
  Yamada S, Ueguchi T
- Organizer
  The 75th Annual Meeting of the Japan Society of Radiological Technology
- Data Source
  KAKENHI-PROJECT-19K08244
[Presentation] Structural Similarity (SSIM)-Based Image Quality Assessment on Iteratively Reconstructed CT Images : Sub-Component Analysis2019
- Author(s)
  Yamada S, Ueguchi T
- Organizer
  The 75th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-19K08244
[Presentation] Structural Similarity (SSIM)-Based Image Quality Assessment on Iteratively Reconstructed CT Images : Sub-Component Analysis2019
- Author(s)
  Yamada S, Ueguchi T
- Organizer
  The 75th Annual Meeting of the Japan Society of Radiological Technology
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] Dual Energy CTを用いた組織内ハイドロゲルスペーサ弁別の可能性2019
- Author(s)
  西田拓哉、岡村啓太、遠地志太、山田幸子、橋渡貴司、井ノ上信一
- Organizer
  日本放射線技術学会第47回秋季学術大会
- Data Source
  KAKENHI-PROJECT-19K17234
[Presentation] The impact of dynamic range-narrowing preprocessing in structural similarity (SSIM)-based image quality assessment2018
- Author(s)
  Yamada S, Ogihara R, Ueguchi T
- Organizer
  The 74th Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-26350471
[Presentation] Development of small-sized dielectric pads for improved RF field homogeneity in MR imaging of the brain at 7 T2017
- Author(s)
  Ueguchi T, Kida I, Yamada S, Liu G
- Organizer
  The 113th Scientific Meeting of the Japan Society of Medical Physics (JSMP)
- Data Source
  KAKENHI-PROJECT-26350471
[Presentation] Development of small-sized dielectric pads for improved RF field homogeneity in MR imaging of the brain at 7 T2017
- Author(s)
  Ueguchi T, Kida I, Yamada S, Liu G
- Organizer
  The 113th Scientific Meeting of the Japan Society of Medical Physics
- Place of Presentation
  パシフィコ横浜，神奈川県横浜市
- Year and Date
  2017-04-13
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Dual-energy virtual monochromatic CT for assessing attenuation values of materials: a potential pitfall and its solution2017
- Author(s)
  Yamada S, Kamiya T, Ogihara R, Fujino K, Shimosegawa E, Hatazawa J
- Organizer
  The 73rd Annual Meeting of the Japan Society of Radiological Technology (JSRT)
- Data Source
  KAKENHI-PROJECT-26350471
[Presentation] Dual-energy CT for assessing attenuation values of phantom material for bone xSPECT/CT2017
- Author(s)
  Yamada S, Kamiya T, Ueguchi T, Ogihara R, Fujino K, Shimosegawa E, Hatazawa J
- Organizer
  The 73rd Annual Meeting of the Japan Society of Radiological Technology
- Place of Presentation
  パシフィコ横浜，神奈川県横浜市
- Year and Date
  2017-04-13
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Quantitative comparison of original versus accelerated NODDI maps of the brain2016
- Author(s)
  Ueguchi T, Kida I, Kobayashi Y, Okada K, Kadono Y, Yamada S, Liu G
- Organizer
  第44回日本磁気共鳴医学会大会
- Place of Presentation
  大宮ソニックシティ，埼玉県さいたま市
- Year and Date
  2016-09-09
- Data Source
  KAKENHI-PROJECT-26350471
[Presentation] Assessment of systematic errors in measured ADC values: a practical approach using easily-available cooling bottles2016
- Author(s)
  Yamada S, Koyama Y, Ueguchi T
- Organizer
  The 72nd Annual Meeting of the Japan Society of Radiological Technology
- Place of Presentation
  パシフィコ横浜，神奈川県横浜市
- Year and Date
  2016-04-14
- Data Source
  KAKENHI-PROJECT-26350471
[Presentation] Quantitative comparison of original versus accelerated NODDI maps of the brain2016
- Author(s)
  Ueguchi T, Kida I, Kobayashi Y, Okada K, Kadono Y, Yamada S, Liu G
- Organizer
  第44回日本磁気共鳴医学会大会
- Place of Presentation
  大宮ソニックシティ，埼玉県さいたま市
- Year and Date
  2016-09-09
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Dual-energy CT for assessing attenuation values of phantom material for bone xSPECT/CT2016
- Author(s)
  Yamada S, Ueguchi T, Kamiya T, Fujino K, Shimosegawa E, Hatazawa J
- Organizer
  第56回日本核医学会学術総会
- Place of Presentation
  名古屋国際会議場，愛知県名古屋市
- Year and Date
  2016-11-03
- Data Source
  KAKENHI-PROJECT-26350471
[Presentation] Assessment of systematic errors in measured ADC values: a practical approach using easily-available cooling bottles2016
- Author(s)
  Yamada S, Koyama Y, Ueguchi T
- Organizer
  The 72nd Annual Meeting of the Japan Society of Radiological Technology
- Place of Presentation
  パシフィコ横浜，神奈川県横浜市
- Year and Date
  2016-04-14
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Dual-energy CT for assessing attenuation values of phantom material for bone xSPECT/CT2016
- Author(s)
  Yamada S, Ueguchi T, Kamiya T, Fujino K, Shimosegawa E, Hatazawa J
- Organizer
  第56回日本核医学会学術総会
- Place of Presentation
  名古屋国際会議場，愛知県名古屋市
- Year and Date
  2016-11-03
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Accuracy of ADC values in diffusion-weighted MRI: a temperature-controlled phantom study2015
- Author(s)
  Yamada S, Koyama Y, Ueguchi T, Murase K
- Organizer
  The 110th Scientific Meeting of the Japan Society of Medical Physics
- Place of Presentation
  北海道大学（札幌市）
- Year and Date
  2015-09-19
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Accuracy of ADC values in diffusion-weighted MRI: a temperature-controlled phantom study2015
- Author(s)
  Yamada S, Koyama Y, Ueguchi T, Murase K
- Organizer
  The 110th Scientific Meeting of the Japan Society of Medical Physics
- Place of Presentation
  北海道大学，北海道札幌市
- Year and Date
  2015-09-19
- Data Source
  KAKENHI-PROJECT-26350471
[Presentation] SSIM-based objective image quality metric for nuclear medicine imaging2015
- Author(s)
  Yamada S, Ueguchi T, Kamiya T, Fujino K, Shimosegawa E, Murase K, Hatazawa J
- Organizer
  The 109th Scientific Meeting of the Japan Society of Medical Physics
- Place of Presentation
  パシフィコ横浜，神奈川県横浜市
- Year and Date
  2015-04-16
- Data Source
  KAKENHI-PROJECT-26350471
[Presentation] SSIM-based objective image quality metric for nuclear medicine imaging2015
- Author(s)
  Yamada S, Ueguchi T, Kamiya T, Fujino K, Shimosegawa E, Murase K, Hatazawa J
- Organizer
  The 109th Scientific Meeting of the Japan Society of Medical Physics
- Place of Presentation
  パシフィコ横浜（横浜市）
- Year and Date
  2015-04-16
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] 逐次近似法を応用したCT再構成画像における画質の「違和感」マッピング2014
- Author(s)
  山田幸子，上口貴志，荻原良太，圓尾浩康，村瀬研也．
- Organizer
  第107回日本医学物理学会学術大会
- Place of Presentation
  パシフィコ横浜（横浜市）
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Dual energy仮想単色CTによるSPECT減弱補正：線減弱係数の精度評価2013
- Author(s)
  山田幸子，上口貴志，下瀬川恵久，藤埜浩一，村瀬研也，畑澤順．
- Organizer
  第53回日本核医学会学術総会
- Place of Presentation
  福岡国際会議場（福岡市）
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] 核医学画像に対するSSIM (structural similarity) indexを用いた画質評価の可能性
- Author(s)
  山田幸子，上口貴志，神谷貴史，藤埜浩一，下瀬川恵久，村瀬研也，畑澤順
- Organizer
  第42回日本放射線技術学会秋季学術大会
- Place of Presentation
  札幌コンベンションセンター（札幌市）
- Year and Date
  2014-10-09 – 2014-10-11
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Perceptual image quality assessment based on SSIM index in nucleaPerceptual image quality assessment based on SSIM index in nuclear medicine imagingr medicine imaging
- Author(s)
  Sachiko Yamada, Takashi Ueguchi, Takashi Kamiya, Koichi Fujino, Eku Shimosegawa, Kenya Murase, Jyun Hatazawa
- Organizer
  The 54th Annual Scientific Meeting of the Japanese Society of Nuclear Medicine
- Place of Presentation
  大阪国際会議場（大阪市）
- Year and Date
  2014-11-06 – 2014-11-08
- Data Source
  KAKENHI-PROJECT-25460751
[Presentation] Perceptual image quality assessment based on SSIM index in nuclear medicine imaging
- Author(s)
  Yamada S, Ueguchi T, Kamiya T, Fujino K, Shimosegawa E, Murase K, Hatazawa J
- Organizer
  The 54th Annual Scientific Meeting of the Japanse Society of Nuclear Medicine
- Place of Presentation
  大阪国際会議場，大阪府大阪市
- Year and Date
  2014-11-06 – 2014-11-08
- Data Source
  KAKENHI-PROJECT-26350471

1. Ueguchi Takashi (80403070)

# of Collaborated Projects: 4 results

# of Collaborated Products: 31 results

Yamada Sachiko 山田 幸子

山田 幸子 ヤマダ サチコ

Research Projects

Research Products

Co-Researchers

臨床MR画像に対するSNR評価の新機軸：すべての撮像法に適用可能な統一的解析法の樹立Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

超高磁場MRI：多素子並列RF励起技術の安全性確立と局所超高分解能撮像への展開

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

A novel radiotherapy treatment planning based on dual-energy virtual monochromatic CTPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Establishment of highly-optimized imaging techniques and quality control procedures for ultrahigh-field MRI

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Studies of fundamental CT techniques for very low dose PET/CTPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

[Journal Article] Accuracy of Dual-Energy Virtual Monochromatic CT Numbers: Comparison between the Single-Source Projection-Based and Dual-Source Image-Based Methods2018

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Dual-energy virtual monochromatic computed tomography for improved attenuation correction in single-photon emission computed tomography in the presence of dense materials2015

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Radiotherapy treatment planning with contrast-enhanced computed tomography: feasibility of dual-energy virtual unenhanced imaging for improved dose calculations2014

Author(s)

Journal Title

DOI

Data Source

[Presentation] Inversion recovery (IR) spin-echo (SE) T1 measurements with flip angle-independent signal model: Robustness to repetition time (TR) setting2023

Author(s)

Organizer

Data Source

[Presentation] Robustness of inversion recovery (IR) spin-echo (SE) T1 measurements to RF field inhomogeneities2023

Author(s)

Organizer

Data Source

[Presentation] Inversion recovery (IR) spin-echo (SE) T1 measurements with flip angle-independent signal model: Robustness to repetition time (TR) settings2023

Author(s)

Organizer

Data Source

[Presentation] Inversion recovery (IR) spin-echo (SE) T1 measurements with flip angle-independent signal model: Robustness to repetition time (TR) settings.2023

Author(s)

Organizer

Data Source

[Presentation] Robustness of inversion recovery (IR) spin-echo (SE) T1 measurements to RF field inhomogeneities.2023

Author(s)

Organizer

Data Source

[Presentation] Robustness of inversion recovery (IR) spin-echo (SE) T1 measurements to RF field inhomogeneities2023

Author(s)

Organizer

Data Source

[Presentation] Dependency of apparent diffusion coefficient values on RF field strength in diffusion MRI2022

Author(s)

Organizer

Data Source

[Presentation] Dependency of apparent diffusion coefficient values on RF field strength in diffusion MRI2022

Author(s)

Yamada Sachiko 山田幸子

山田幸子ヤマダサチコ