Program Information
Application of Jaw-Tracking Function in VMAT for Upper Thoracic Esophageal Cancer
W Zhang*, J Chen , T Zhai , L Yan , C Chen , Cancer Hospital of Shantou University Medical College, Shantou, Guangdong
Presentations
SU-E-T-125 (Sunday, July 12, 2015) 3:00 PM - 6:00 PM Room: Exhibit Hall
Purpose:
To explore the effect of the Jaw₋tracking with RapidArc(JT-RapidArc) plans for upper thoracic esophageal cancer.
Methods:
Treatment planning was designed by using RapidArc and JT₋RapidArc techniques for 11 consecutive patients. The dose₋volume histogram parameters of PTV and the organs at risk(OAR), conformity index(CI), heterogeneity index(HI), low dose volume of normal tissue(B₋P) and monitor units(MUs) were compared between the different techniques.
Results:
JT₋RapidArc plans provided the better coverage of PTV1(64) D98 and HI(P<0.05), lower MLD, D2 of PTV1(64) and PTV2(54), but no statistically difference in CI(P>0.05), which comparison with RapidArc plans. Plans with JT₋RapidArc had lower Lung of V5, V10, V13, V20, V30, MLD(P<0.05); heart of V20, MLD(P<0.05); and B₋P of V5, V10, V15, V20, V30(P<0.05); but no significantly different in Spinal cord and SC₋PRV as compared with RapidArc plans. JT₋RapidArc plans increaseed the MUs by 1%(P>0.05) as compared with RapidArc plans.
Conclusion:
All of the plans had met the requirements of clinical dosimetry. JT₋RapidArc plans as compared with RapidArc plans, showing better part of target coverage, part of OARS(lung and heart) and heart and B₋P sparing, which MUs was slightly increased.
Funding Support, Disclosures, and Conflict of Interest: This work was sponsored by Shantou University Medical College Clinical Research Enhancement Initiative(NO.201424)
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