Three-dimensional treatment planning for maxillary cancer using a CT simulator

Yasushi Nagata, Kaoru Okajima, Rumi Murata, Michihide Mitsumori, Takashi Mizowaki, Kazushige Tsutsui, Koji Ono, Yasumasa Nishimura, Masahiro Hiraoka, Takehiro Nishidai, Masaji Takahashi, Mitsuyuki Abe

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    Abstract

    Purpose: The results of three-dimensional treatment planning using a computed tomography simulator were evaluated in patients with maxillary cancer. Methods and Materials: Treatment planning was done in 25 patients using an x-ray simulator and plain x-ray films (1979-1982, group 1) in 34 patients using an x-ray simulator and computed tomography films (1983-1987, group 2), in 24 patients using a computed tomography simulator (1988-1992, group 3). The number of patients with Stage IV disease increased in the order of group 1 to group 3. Results: The average radiation field was smallest in group 3 (66.5 cm2) followed by group 2 (67.4 cm2) and group 1 (72.9 cm2). A radiation dose of more than 30 Gy to the lens of the effected side was delivered to 13% of group 3, 44% of group 2, and 44% of group 1. The dose to the lens on the uneffected side was zero in 56% of group 1, 74% of group 2, and 96% of group 3. A long-term decrease in visual activity on the effected side occurred in 11% of group 3, 32% of group 2, and 44% of group 1. However, a significant increase in survival was only noted between groups 1 and 2, because the three population of patients were different. Conclusion: The three-dimensional treatment planning results in a better treatment than two-dimensional treatment planning as measured by complication rates and field sizes.

    Original languageEnglish (US)
    Pages (from-to)979-983
    Number of pages5
    JournalInternational journal of radiation oncology, biology, physics
    Volume30
    Issue number4
    DOIs
    StatePublished - Nov 15 1994

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    Keywords

    • CT simulator
    • Dose to lens
    • Maxillary cancer
    • Three-dimensional treatment planning

    ASJC Scopus subject areas

    • Radiation
    • Oncology
    • Radiology Nuclear Medicine and imaging
    • Cancer Research

    Cite this

    Nagata, Y., Okajima, K., Murata, R., Mitsumori, M., Mizowaki, T., Tsutsui, K., Ono, K., Nishimura, Y., Hiraoka, M., Nishidai, T., Takahashi, M., & Abe, M. (1994). Three-dimensional treatment planning for maxillary cancer using a CT simulator. International journal of radiation oncology, biology, physics, 30(4), 979-983. https://doi.org/10.1016/0360-3016(94)90375-1