Deep learning-based in vivo dose verification from proton-induced secondary-electron-bremsstrahlung images with various count level

Takuya Yabe*, Mitsutaka Yamaguchi, Chih Chieh Liu, Toshiyuki Toshito, Naoki Kawachi, Seiichi Yamamoto

*この研究の対応する著者

研究成果: Article査読

抄録

Purpose: Proton-induced secondary-electron-bremsstrahlung (SEB) imaging is a promising method for estimating the ranges of particle beam. However, SEB images do not directly represent dose distributions of particle beams. In addition, the ranges estimated from measured images were deviated because of limited spatial resolutions of the developed x-ray camera as well as statistical noise in the images. To solve these problems, we proposed a method for predicting high-resolution dose images from SEB images with various count level using a deep learning (DL) approach for range and width verification. Methods: In this study, we adopted the double U-Net model, which is a previously proposed deep convolutional network model. The first U-Net model in the double U-Net model was used to denoise the SEB images with various count level. The first U-Net model for denoising was trained on 8000 pairs of SEB images with various count level and noise-free images which were created by a sophisticated in-house developed model function. The second U-Net model for dose prediction was trained using 8000 pairs of denoised SEB images from the first U-Net model and high-resolution dose images generated by Monte Carlo simulation. Results: For both simulation and measurement data, the trained DL model could successfully predict high-resolution dose images which showed a clear Bragg peak and no statistical noise. The difference of the range and width was less than 2.1 mm, even from the SEB images measured with a decrease in the number of irradiated protons to less than 11% of 3.2 × 1011 protons. Conclusions: High-resolution dose images from measured and simulated SEB images were successfully predicted by using the trained DL model for protons. Our proposed DL model was feasible to predict dose images accurately even with smaller number of irradiated protons.

本文言語English
ページ(範囲)130-139
ページ数10
ジャーナルPhysica Medica
99
DOI
出版ステータスPublished - 2022 7月

ASJC Scopus subject areas

  • 生物理学
  • 放射線学、核医学およびイメージング
  • 物理学および天文学(全般)

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