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KMID : 1164220130250020153
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Journal of Korean Society for Radiotherapeutic Technology
2013 Volume.25 No. 2 p.153 ~ p.158
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Comparison of Beam Delivery Modes in Prostate Cancer Proton Therapy: A Treatment Planning Comparison Study
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Kim Youn-Young
Youm Doo-Seok
Jang Yo-Jong
Kang Dong-Yun
Park Jeong-Hoon
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Abstract
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Purpose: After making two plans, the Double Scattering (DS) Mode and The Pencil Beam Scanning (PBS) Mode,
of patients on early prostate cancer, we not only compare the dose conformity and the dose homogeneity by
analyzing each DVH, CN and HI, but also evaluate normal structures’s sparing effect on each mode.
Materials and Methods: Planes about nine patients, who did proton therapy, on prostate cancer was setted using
the Eclipse proton external beam planning system. The prescription dose, every 2.5 Gy×28 fractions=70 Gy, was
delivered to the PTV. The CN and the HI were getted by anlazing each DVHs for the DS Plan and the PBS Plan.
Also, normal structures’ %volumes according to dose of the PBS are campared with those of the DS.
Results: The average CN of the PTV is increase 16.63% from DS 0.68±0.07 to PBS 0.79±0.01, and the average IN
of the PTV is decrease -22.66 % from DS 0.12±0.03 to PBS 0.09±0.01. The PBS has litter %Volumes of normal
structures than the DS about every patient except Rectum. The average %Volume of Left Femoral Head receiving ≥
30 Gy shows most high decreasing rate, -79.93%, from DS to PBS and the average %Volume of Rectum receiving
≥70 Gy shows most low decreasing rate, -3.03%, from DS to PBS.
Conclusion: Therefore, the PBS is more effective achieving the dose conformity and the dose Homogeneity than
DS, and better to reduce unnecessary dose arriving normal structures, especially the femoral heads.
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KEYWORD
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PBS-pencil beam scanning mode, DS-double scattering mode, DVHs
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