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Factors affecting the accuracy of respiratory tracking of the image-guided robotic radiosurgery system

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Japanese Journal of Radiology Aims and scope Submit manuscript

Abstract

Purpose

To analyze the factors affecting the tracking accuracy of the CyberKnife Synchrony Respiratory Tracking System (SRTS).

Materials and methods

A dynamic motion phantom (motion phantom) reproduced the respiratory motions of each patient treated with the SRTS using a ball as the target. CyberKnife tracked the ball using the SRTS, and this process was recorded by a video camera mounted on the linear accelerator head. The tracking error was evaluated from the images captured by the video camera. Multiple regression analysis was used to identify factors affecting tracking accuracy from 91 cases.

Results

The median tracking error was 1.9 mm (range 0.9–5.3 mm). Four factors affected the tracking accuracy: the average absolute amplitude of the tumor motion in the cranio-caudal (CC) direction (p = 0.007), average position gap due to the phase shift between the internal tumor and external marker positions in the CC direction (p < 0.001), and average velocity of the tumor in the CC (p < 0.001) and anterior–posterior directions (p = 0.033).

Conclusion

We identified factors that affected tracking accuracy. This information may assist the identification of suitable margins that should be added to each patient’s clinical target volume.

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Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Author information

Authors and Affiliations

  1. Department of Radiotherapy Quality Management, Yokohama CyberKnife Center, 574-1, Ichisawa-cho, Asahi-ku, Yokohama, 241-0014, Japan

    Mitsuhiro Inoue, Kohei Okawa, Junichi Taguchi, Yoshifumi Hirota, Yohei Yanagiya & Chie Kikuchi

  2. Department of Radiation Oncology, Yokohama CyberKnife Center, Yokohama, Japan

    Hiromitsu Iwata & Izumi Koike

  3. Department of Neurosurgery, Yokohama CyberKnife Center, Yokohama, Japan

    Koshi Tatewaki & Seiji Ohta

  4. Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan

    Kohei Okawa

  5. Department of Radiation Therapy, Itabashi Chuo Medical Center, Tokyo, Japan

    Michio Iwabuchi

  6. Department of Radiology, Nagoya City University Graduate School of Medical Science, Nagoya, Japan

    Taro Murai

  7. Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, Nagoya, Japan

    Hiromitsu Iwata

  8. Soseikai Clinic CyberKnife Center, Kyoto, Japan

    Hiroya Shiomi

  9. Department of Radiation Oncology, Osaka University Graduate School of Medicine, Osaka, Japan

    Hiroya Shiomi

  10. Department of Radiology, Yokohama City University Graduate School of Medicine, Yokohama, Japan

    Izumi Koike

Authors
  1. Mitsuhiro Inoue
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  2. Kohei Okawa
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  3. Junichi Taguchi
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  4. Yoshifumi Hirota
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  5. Yohei Yanagiya
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  6. Chie Kikuchi
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  7. Michio Iwabuchi
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  8. Taro Murai
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  9. Hiromitsu Iwata
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  10. Hiroya Shiomi
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  11. Izumi Koike
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  12. Koshi Tatewaki
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  13. Seiji Ohta
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Corresponding author

Correspondence to Mitsuhiro Inoue.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical statement

All study participants provided informed consent and the study design was approved by the appropriate ethics review board.

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Cite this article

Inoue, M., Okawa, K., Taguchi, J. et al. Factors affecting the accuracy of respiratory tracking of the image-guided robotic radiosurgery system. Jpn J Radiol 37, 727–734 (2019). https://doi.org/10.1007/s11604-019-00859-7

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  • DOI: https://doi.org/10.1007/s11604-019-00859-7

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