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Article10.1118/1.4923987

SU‐E‐P‐53: A Plan Quality Comparison for Volumetric‐Modulated Arc Therapy by Different Maximum Delivery Time Setting for Cervical and Upper Thoracic Esophageal Cancer

Jie Yang,D Liu,Mingyuan Miao,Jing Zhang,Z Li-2015-06-01-Medical Physics
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TL;DRAbstract

Purpose: To evaluate and compare the treatment plan quality of volumetric modulated arc therapy (VMAT) plans using different constrain conditions of delivery time for cervical and upper thoracic esophageal cancer. Methods: In this retrospective study, single‐arc VMAT plans were generated with the Oncentra 4.3v system for twenty cervical and upper thoracic esophageal cancer cases. The maximum delivery time were set systematically various as 80s, 110s and 150s. Planning objectives were to deliver 60 Gy in 30 fractions to 95% of PTV, with maximum doses of spinal cord <45 Gy, V5Gy<50%, V10Gy<40%, V20Gy<25% and V30Gy<20% to the lung tissue. All of the three groups of VMAT plans were clinical acceptable. For plan evaluation statistics, PTVDmax, PTVDmin, PTVDmean, PTVD100∼D2, PTVV110∼V90, CordDmax, CordD2, CORDD40, LungDmean, LungV5∼V40 were analyzed and compared by SPSS 20.0. Results: The dose distribution quality of plans generated by different maximum delivery time settings

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Purpose: To evaluate and compare the treatment plan quality of volumetric modulated arc therapy (VMAT) plans using different constrain conditions of delivery time for cervical and upper thoracic esophageal cancer. Methods: In this retrospective study, single‐arc VMAT plans were generated with the Oncentra 4.3v system for twenty cervical and upper thoracic esophageal cancer cases. The maximum delivery time were set systematically various as 80s, 110s and 150s. Planning objectives were to deliver 60 Gy in 30 fractions to 95% of PTV, with maximum doses of spinal cord <45 Gy, V5Gy<50%, V10Gy<40%, V20Gy<25% and V30Gy<20% to the lung tissue. All of the three groups of VMAT plans were clinical acceptable. For plan evaluation statistics, PTVDmax, PTVDmin, PTVDmean, PTVD100∼D2, PTVV110∼V90, CordDmax, CordD2, CORDD40, LungDmean, LungV5∼V40 were analyzed and compared by SPSS 20.0. Results: The dose distribution quality of plans generated by different maximum delivery time settings

Keywords

MedicineNuclear medicineEsophageal cancerRadiation therapyRadiologyCancer

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