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Dose impact of rectal gas on prostatic IMRT and VMAT

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Abstract

Purpose

In this study, we compared the dose impact of the heterogeneity caused by rectal gas using two methods of treatment planning for intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc therapy (VMAT).

Materials and methods

In addition to the structure set used for the standard treatment plan, we created a structure set for evaluation for each patient. These sets were transferred to the same isocenter as the respective treatment plans for IMRT and VMAT that were to become the standard. Values were then recalculated.

Results

During the standard prostatic IMRT and VMAT treatment planning, all study participants met dose restrictions in place at our hospital. Dose restrictions were fulfilled in treatment plans for evaluation, excluding those with a clinical target volume (CTV) of V 100 % and planning target volume (PTV) of D 95 when the rectum was excluded. However, in treatment plans for evaluation, IMRT was shown to have a higher concordance rate with standard treatment plans than VMAT.

Conclusion

If rectal gas is present during either IMRT or VMAT, a dose decrease will occur in relation to CTV and PTV, suggesting that a plan does not eliminate adverse effects on organs at risk.

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Authors and Affiliations

  1. Department of Radiological Technology, Tokushima University Hospital, 2-50-1 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Motoharu Sasaki & Taro Kishi

  2. Department of Therapeutic Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Hitoshi Ikushima & Masahide Tominaga

  3. Department of Therapeutic Radiology, Nagoya University Graduate School of Medicine, 65 Tsurumai, Showa-ku, Nagoya, Aichi, 466-8550, Japan

    Takeshi Kamomae

  4. Graduate School of Health Science, University of Okayama, 2-5-1 Shikata-cho, Okayama Kita-ku, Okayama, 700-8558, Japan

    Masataka Oita

  5. Department of Radiology and Radiation Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Motoharu Sasaki & Masafumi Harada

Authors
  1. Motoharu Sasaki
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  2. Hitoshi Ikushima
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  3. Masahide Tominaga
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  4. Takeshi Kamomae
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  5. Taro Kishi
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  6. Masataka Oita
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  7. Masafumi Harada
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Corresponding author

Correspondence to Motoharu Sasaki.

Ethics declarations

Ethical standards

Informed consent was obtained from all participants in the study. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

Conflict of interest

We have nothing to declare for this study.

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Sasaki, M., Ikushima, H., Tominaga, M. et al. Dose impact of rectal gas on prostatic IMRT and VMAT. Jpn J Radiol 33, 723–733 (2015). https://doi.org/10.1007/s11604-015-0481-7

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  • DOI: https://doi.org/10.1007/s11604-015-0481-7

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