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Changes in rectal volume and prostate localization due to placement of a rectum-emptying tube

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Abstract

Purpose

Rectal volume variation has a crucial effect on prostate localization during external beam radiotherapy for prostate cancer. This study investigated the effect of rectal volume reduction by a rectum-emptying tube (RET) on prostate immobilization.

Materials and methods

The study group comprised 21 patients who underwent proton beam treatment for prostate cancer. Sigmoid-shaped flexible plastic RETs were used to drain gases from the rectum. Computed tomography (CT) was performed before and after RET placement at the treatment planning stage and at the beginning of treatment. Prostate displacement and changes in rectal volume were measured on the CT images. The feasibility of RET placement was evaluated during and after the procedure.

Results

All 21 patients tolerated the procedure. The rectal volume was significantly lower with a RET than without a RET. The differences in rectal volume between the treatment planning stage and the beginning of treatment were significantly lower with a RET than without. RET placement significantly decreased prostate displacement in the anteroposterior and superoinferior directions but not in the left-right direction.

Conclusion

RET placement reduced both rectal volume and variation in rectal volume. The procedure reduced displacement of the prostate. RET placement thus appears to be an effective technique for immobilizing the prostate.

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Author information

Authors and Affiliations

  1. Proton Therapy Division, Shizuoka Cancer Center, 1007 Shimonagakubo, Nagaizumi, Shizuoka, 411-8777, Japan

    Hiroshi Fuji, Shigeyuki Murayama & Haruo Yamashita

  2. Urology Division, Shizuoka Cancer Center, Shizuoka, Japan

    Masashi Niwakawa, Raizou Yamaguchi, Ryou Yamashita, Takashi Matsui & Kenichi Tobisu

  3. Radiation Oncology Division, Shizuoka Cancer Center, Shizuoka, Japan

    Tetsuo Nishimura

Authors
  1. Hiroshi Fuji
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  2. Shigeyuki Murayama
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  3. Masashi Niwakawa
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  4. Raizou Yamaguchi
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  5. Ryou Yamashita
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  6. Takashi Matsui
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  7. Haruo Yamashita
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  8. Tetsuo Nishimura
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  9. Kenichi Tobisu
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Corresponding author

Correspondence to Hiroshi Fuji.

Additional information

The authors have no conflicts of interests to declare. The content of this article was presented at the 2008 Genitourinary Cancers Symposium, San Francisco, February 2008.

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Fuji, H., Murayama, S., Niwakawa, M. et al. Changes in rectal volume and prostate localization due to placement of a rectum-emptying tube. Jap J Radiol 27, 205–212 (2009). https://doi.org/10.1007/s11604-009-0323-6

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  • DOI: https://doi.org/10.1007/s11604-009-0323-6

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