1. Message from the retiring Editor-in-Chief

   • Kunio Doi

   Editorial 24 August 2021 Pages: 211 - 211

2. Message from the new Editor-in-Chief

   • Nobuyuki Kanematsu

   Editorial 11 August 2021 Pages: 212 - 214

3. Medical application of particle and heavy ion transport code system PHITS

   • Takuya Furuta
   • Tatsuhiko Sato

   ReviewPaper 30 June 2021 Pages: 215 - 225

   

4. Dosimetric comparison between different tangential field arrangements during left-sided breast cancer radiotherapy

   • Mostafa Robatjazi
   • Hamid Reza Baghani
   • Pejman Porouhan

   OriginalPaper 27 May 2021 Pages: 226 - 237

   

5. Investigation of clinical target volume segmentation for whole breast irradiation using three-dimensional convolutional neural networks with gradient-weighted class activation mapping

   • Megumi Oya
   • Satoru Sugimoto
   • Kazuhito Yokoyama

   OriginalPaper 16 June 2021 Pages: 238 - 247

   

6. Clinicopathologic breast cancer characteristics: predictions using global textural features of the ipsilateral breast mammogram

   • Ibrahem H. Kanbayti
   • William I. D. Rae
   • Ernest U. Ekpo

   OriginalPaper 02 June 2021 Pages: 248 - 261

   

7. High-dose-rate brachytherapy using inverse planning optimization with tandem and ovoid applicators for locally advanced cervical cancer: a simulation study

   • Yuji Yaegashi
   • Kohei Sasaki

   OriginalPaper 02 June 2021 Pages: 262 - 270

   

8. Impact of spot positional errors in robustly optimized intensity-modulated proton therapy plan of craniospinal irradiation

   • Manthala Padannayil Noufal
   • Shamurailatpam Dayananda Sharma
   • Rakesh Jalali

   OriginalPaper 05 June 2021 Pages: 271 - 278

   

9. Evaluation of the dosimetric impact of heart function-based volumetric modulated arc therapy planning in patients with esophageal cancer

   • Shohei Tanaka
   • Noriyuki Kadoya
   • Keiichi Jingu

   OriginalPaper 08 June 2021 Pages: 279 - 287

   

10. Correlations between cardiovascular parameters and image parameters on dynamic chest radiographs in a porcine model under fluid loading

    • Rie Tanaka
    • Tohru Tani
    • Shigeru Sanada

    OriginalPaper 21 June 2021 Pages: 288 - 296

    

11. Microdosimetry-based relative biological effectiveness calculations for radiotherapeutic electron beams: a FLUKA-based study

    • Arghya Chattaraj
    • T. Palani Selvam

    OriginalPaper 02 July 2021 Pages: 297 - 308

    

12. Surface dose and build-up region depth dose measurements in non-standard beams of Cyberknife and tomotherapy systems

    • Amalraj Jerrin
    • Velayudham Ramasubramanian

    OriginalPaper 05 July 2021 Pages: 309 - 317

    

13. Effects of sample size and data augmentation on U-Net-based automatic segmentation of various organs

    • Takafumi Nemoto
    • Natsumi Futakami
    • Naoyuki Shigematsu

    OriginalPaper 12 July 2021 Pages: 318 - 327

    

14. Dosimetric effects of quality assurance-related setup errors in passive proton therapy for prostate cancer with and without a hydrogel spacer

    • Yuta Omi
    • Keisuke Yasui
    • Naoki Hayashi

    OriginalPaper 27 July 2021 Pages: 328 - 335

    

15. Verification of phantom accuracy using a Monte Carlo simulation: bone scintigraphy chest phantom

    • Toshimune Ito
    • Hirotatsu Tsuchikame
    • Hiroshi Tomizawa

    OriginalPaper 24 July 2021 Pages: 336 - 344