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KMID : 1164220140260020281
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Journal of Korean Society for Radiotherapeutic Technology
2014 Volume.26 No. 2 p.281 ~ p.287
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A comprehensive comparison of IMRT and VMAT plan quality for orbital lymphoma
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Yoo Soon-Mi
Ban Tae-Joon
Yoon In-Ha
Back Geum-Mun
Kwon Kyung-Tae
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Abstract
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Purpose : The purpose of this study is to compare the plan quality of volumetric-modulated arc therapy (VMAT) and intensitymodulated radiation therapy (IMRT) for the treatment of orbital lymphoma. IMRT, partial single arc(SA) and partial-double arc(DA) VMAT plans for four patients with orbital lymphoma treated at our institution were used for this study. Conformity Index(CI), Paddick’s Conformity Index(PCI) and Homogeneity Index(HI) of planning target volume(PTV) were used to evaluate dosimetric quality of each plan. The Monitor Unit (MU), treatment time and dose of ipsilateral lens from each type of plan were measured for comparison.
Materials and Methods : The CI of PTV for IMRT, SA and DA were measured as 0.88, 0.86, 0.92. The PCI of DA was the
lowest as 1.33. Also HI of DA was the lowest in measured plans as 1.15. Mean dose of lens, lacrimal gland, optic chiasm, the opposite optic nerve and both orbit was analyzed with V30,V20,V10,V5. The result showed that the lowest dose in IMRT
highest in SA in opposite lens, lacrimal gland, optic nerve, orbit.
Results : Treatment time and average MU of IMRT was about three times higher than SA.
Conclusion : Considering the superior plan quality as well as the delivery efficiency of VMAT compared with that of IMRT,
VMAT may be the preferred modality for treating orbital lymphoma.
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KEYWORD
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Orbital lymphoma, IMRT, VMAT, RapidArc
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