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Article

An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography

  • Authors:
    • Xin Wang
    • Min Yu
    • Jin Wang
    • Renming Zhong
    • Yali Shen
    • Yaqin Zhao
    • Zhiping Li
    • Sen Bai
    • Feng Xu
  • View Affiliations / Copyright

    Affiliations: Department of Radiation Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
  • Pages: 271-277
    |
    Published online on: December 10, 2015
       https://doi.org/10.3892/mco.2015.704
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Abstract

Interfractional variations of the bladder, rectum and vagina may affect the accuracy of postoperative intensity‑modulated radiotherapy in patients with cervical cancer. This study aimed to assess the interfractional variations with daily kv cone‑beam computed tomography (CBCT). All the patients were instructed to control the filling status of the bladder and rectum. CBCT images were obtained daily after set‑up and the bladder, rectum and vagina were contoured on each CBCT scan. All the contours were transferred to the planning CT following image fusion. Interfractional variations in pelvic organs were assessed with CBCT based on two reference lines, which were identified as A (the midsaggital line across the superior border of pubic symphysis) and B (a parallel line 1.5 cm above line A). The mean volume (range) of the bladder and rectum was 156.5 (1.7‑626.5) and 48.2 (11.3‑139.7) ml, respectively. The uniform planning target volume (PTV) margin of 10 mm failed to encompass the vagina in 17.3 and 18.1% of the fractions on lines A and B, respectively. The motion of the vagina (standard deviation) was 0.3 (0.3) and 0.1 (0.5) cm on lines A and B, respectively. The anteroposterior dimension and position of the vagina were significantly affected by the filling status of the bladder (P<0.05), but not by that of the rectum. Although instructions were given, the interfractional variations of the vagina and other pelvic organs were significant, which may exceed the uniform PTV margin; therefore, more effective methods to decrease these variations should be investigated.
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Copy and paste a formatted citation
Spandidos Publications style
Wang X, Yu M, Wang J, Zhong R, Shen Y, Zhao Y, Li Z, Bai S and Xu F: An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography. Mol Clin Oncol 4: 271-277, 2016.
APA
Wang, X., Yu, M., Wang, J., Zhong, R., Shen, Y., Zhao, Y. ... Xu, F. (2016). An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography. Molecular and Clinical Oncology, 4, 271-277. https://doi.org/10.3892/mco.2015.704
MLA
Wang, X., Yu, M., Wang, J., Zhong, R., Shen, Y., Zhao, Y., Li, Z., Bai, S., Xu, F."An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography". Molecular and Clinical Oncology 4.2 (2016): 271-277.
Chicago
Wang, X., Yu, M., Wang, J., Zhong, R., Shen, Y., Zhao, Y., Li, Z., Bai, S., Xu, F."An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography". Molecular and Clinical Oncology 4, no. 2 (2016): 271-277. https://doi.org/10.3892/mco.2015.704
Copy and paste a formatted citation
x
Spandidos Publications style
Wang X, Yu M, Wang J, Zhong R, Shen Y, Zhao Y, Li Z, Bai S and Xu F: An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography. Mol Clin Oncol 4: 271-277, 2016.
APA
Wang, X., Yu, M., Wang, J., Zhong, R., Shen, Y., Zhao, Y. ... Xu, F. (2016). An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography. Molecular and Clinical Oncology, 4, 271-277. https://doi.org/10.3892/mco.2015.704
MLA
Wang, X., Yu, M., Wang, J., Zhong, R., Shen, Y., Zhao, Y., Li, Z., Bai, S., Xu, F."An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography". Molecular and Clinical Oncology 4.2 (2016): 271-277.
Chicago
Wang, X., Yu, M., Wang, J., Zhong, R., Shen, Y., Zhao, Y., Li, Z., Bai, S., Xu, F."An assessment of interfractional bladder, rectum and vagina motion in postoperative cervical cancer based on daily cone‑beam computed tomography". Molecular and Clinical Oncology 4, no. 2 (2016): 271-277. https://doi.org/10.3892/mco.2015.704
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