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Article

FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer

  • Authors:
    • Yuanda Zheng
    • Xiaojiang Sun
    • Jian Wang
    • Lingnan Zhang
    • Xiaoyun Di
    • Yaping Xu
  • View Affiliations / Copyright

    Affiliations: Department of Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China, Department of Radiology, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
  • Pages: 1015-1020
    |
    Published online on: February 12, 2014
       https://doi.org/10.3892/ol.2014.1874
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Abstract

18F‑fluorodeoxyglucose (FDG)‑positron emission tomography (PET)/computed tomography (CT) has the potential to improve the staging and radiation treatment (RT) planning of various tumor sites. However, from a clinical standpoint, questions remain with regard to what extent PET/CT changes the target volume and whether PET/CT reduces interobserver variability in target volume delineation. The present study analyzed the use of FDG‑PET/CT images for staging and evaluated the impact of FDG‑PET/CT on the radiotherapy volume delineation compared with CT in patients with non‑small cell lung cancer (NSCLC) who were candidates for radiotherapy. Intraobserver variation in delineating tumor volumes was also observed. In total, 23 patients with stage I‑III NSCLC were enrolled and treated with fractionated RT‑based therapy with or without chemotherapy. FDG‑PET/CT scans were acquired within two weeks prior to RT. PET and CT data sets were sent to the treatment planning system, Pinnacle, through compact discs. The CT and PET images were subsequently fused by means of a dedicated RT planning system. Gross tumor volume (GTV) was contoured by four radiation oncologists on CT (GTV‑CT) and PET/CT images (GTV‑PET/CT). The resulting volumes were analyzed and compared. For the first phase, two radiation oncologists outlined the contours together, achieving a final consensus. Based on PET/CT, changes in tumor-node-metastasis categories occurred in 8/23 cases (35%). Radiation targeting with fused FDG‑PET and CT images resulted in alterations in radiation therapy planning in 12/20 patients (60%) in comparison with CT targeting. The most prominent changes in GTV were observed in cases with atelectasis. For the second phase, the variation in delineating tumor volumes was assessed by four observers. The mean ratio of largest to smallest CT‑based GTV was 2.31 (range, 1.01‑5.96). The addition of the PET results reduced the mean ratio to 1.46 (range, 1.02‑2.27). PET/CT fusion images may have a potential impact on tumor staging and treatment planning. Implementing matched PET/CT results reduced observer variation in delineating tumor volumes significantly with respect to CT only.
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Copy and paste a formatted citation
Spandidos Publications style
Zheng Y, Sun X, Wang J, Zhang L, Di X and Xu Y: FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer. Oncol Lett 7: 1015-1020, 2014.
APA
Zheng, Y., Sun, X., Wang, J., Zhang, L., Di, X., & Xu, Y. (2014). FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer. Oncology Letters, 7, 1015-1020. https://doi.org/10.3892/ol.2014.1874
MLA
Zheng, Y., Sun, X., Wang, J., Zhang, L., Di, X., Xu, Y."FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer". Oncology Letters 7.4 (2014): 1015-1020.
Chicago
Zheng, Y., Sun, X., Wang, J., Zhang, L., Di, X., Xu, Y."FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer". Oncology Letters 7, no. 4 (2014): 1015-1020. https://doi.org/10.3892/ol.2014.1874
Copy and paste a formatted citation
x
Spandidos Publications style
Zheng Y, Sun X, Wang J, Zhang L, Di X and Xu Y: FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer. Oncol Lett 7: 1015-1020, 2014.
APA
Zheng, Y., Sun, X., Wang, J., Zhang, L., Di, X., & Xu, Y. (2014). FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer. Oncology Letters, 7, 1015-1020. https://doi.org/10.3892/ol.2014.1874
MLA
Zheng, Y., Sun, X., Wang, J., Zhang, L., Di, X., Xu, Y."FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer". Oncology Letters 7.4 (2014): 1015-1020.
Chicago
Zheng, Y., Sun, X., Wang, J., Zhang, L., Di, X., Xu, Y."FDG‑PET/CT imaging for tumor staging and definition of tumor volumes in radiation treatment planning in non‑small cell lung cancer". Oncology Letters 7, no. 4 (2014): 1015-1020. https://doi.org/10.3892/ol.2014.1874
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