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KMID : 1164220220340010083
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Journal of Korean Society for Radiotherapeutic Technology
2022 Volume.34 No. 1 p.83 ~ p.92
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Evaluation of the usefulness of Halcyon VMAT treatment plan through comparison with tomotherapy in bilateral breast cancer radiation therapy
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Lim Jun-Taek
Park Ju-Young
Park Su-Yeon
Jeon Seong-Jin
Park Tae-Yang
Hwang Da-Jin
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Abstract
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Purpose: To evaluate usefulness of Tomotherapy and Halcyon VMAT treatment in radiation therapy for bi-breast cancer
Materials and Methods: For 10 patients with bi-breast cancer, volumetric modulated arc therapy(VMAT) treatment plan was established using helical Tomotherapy(Accuray. USA) with field width of 5.0-cm and pitch of 0.287, and Halcyon(Varian Medical System, Palo Alto, CA, Version 3.0 USA) of 6arc and 8arc. Prescribed dose was 42.4 Gy/16, and V 40.3Gy of Planning Target Volume(PTV) was 90%. The quality of plan was evaluated by comparing the dose to tumor and normal organs, and the efficiency was evaluated by comparing total MU and beam on time.
Results: About three treatment plans(Tomotherapy, Halcyon 6Arc VMAT, Halcyon 8Arc VMAT) , the mean homogeneity index(H.I) of PTV were 1.07, 1.10, 1.11, and the mean conformity index(C.I) of PTV were 1.21, 1.16, 1.17, respectively. The average value of the dose assessment item for a normal organ is V 5Gy(%) of both lung was 36.3, 31.2, 29.7, and V 15Gy(%) were 18.6, 15.5, 14.6, respectively. The mean heart dose(Gy) were 4.17, 2.69, 2.51. Total MU were (7498.6, 2494.2, 2471.5), and beam on time(sec) were 462.5, 195.4, 198.0.
Conclusion: Halcyon VMAT showed similar quality of treatment plan compared to helical Tomotherapy, while also protecting normal organs. In addition, the efficiency of radiotherapy increased due to a decrease in Beam On Time and MU.
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KEYWORD
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Helical IMRT, Tomotherapy, Halcyon VMAT
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