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JACIII Vol.26 No.4 pp. 471-482
doi: 10.20965/jaciii.2022.p0471
(2022)

Paper:

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Improved Tumor Image Estimation in X-Ray Fluoroscopic Images by Augmenting 4DCT Data for Radiotherapy

Takumi Shinohara*1, Kei Ichiji*2, Jiaoyang Wang*1, Noriyasu Homma*1,*2, Xiaoyong Zhang*2,*3, Norihiro Sugita*4, and Makoto Yoshizawa*5

*1Graduate School of Biomedical Engineering, Tohoku University
2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan

*2Tohoku University Graduate School of Medicine
2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan

*3National Institute of Technology, Sendai College
4-16-1 Ayashi-Chuo, Aoba-ku, Sendai, Miyagi 989-3128, Japan

*4Graduate School of Engineering, Tohoku University
6-6-05 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan

*5Center for Promotion of Innovation Strategy, Tohoku University
468-1 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-0845, Japan

Received:
December 21, 2021
Accepted:
March 11, 2022
Published:
July 20, 2022
Creative Commons License
Keywords:
radiotherapy, X-ray image, hidden Markov model, data augmentation
Abstract

Measurement of tumor position is important for the radiotherapy of lung tumors with respiratory motion. Although tumors can be observed using X-ray fluoroscopy during radiotherapy, it is often difficult to measure tumor position from X-ray image sequences accurately because of overlapping organs. To measure tumor position accurately, a method for extracting tumor intensities from X-ray image sequences using a hidden Markov model (HMM) has been proposed. However, the performance of tumor intensity extraction depends on limited knowledge regarding the tumor motion observed in the four-dimensional computed tomography (4DCT) data used to construct the HMM. In this study, we attempted to improve the performance of tumor intensity extraction by augmenting 4DCT data. The proposed method was tested using simulated datasets of X-ray image sequences. The experimental results indicated that the HMM using the augmentation method could improve tumor-tracking performance when the range of tumor movement during treatment differed from that in the 4DCT data.

Process of tumor image extraction

Process of tumor image extraction

Cite this article as:
T. Shinohara, K. Ichiji, J. Wang, N. Homma, X. Zhang, N. Sugita, and M. Yoshizawa, “Improved Tumor Image Estimation in X-Ray Fluoroscopic Images by Augmenting 4DCT Data for Radiotherapy,” J. Adv. Comput. Intell. Intell. Inform., Vol.26 No.4, pp. 471-482, 2022.
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Last updated on Apr. 22, 2024