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Purpose: To verify dose delivery and quality assurance of volumetricmodulated arc therapy (VMAT) for head and neck cancer.  Method: The Imaging and Radiation Oncology Core Houston (IROC-H) head andneck phantom with thermo- luminescent dosimeters (TLDs) and films, were imagedwith computed tomography scan and the reconstructed image was transferred topinnacle treatment planning system (TPS). On TPS the planning target volume(PTV), secondary target volume (STV) and organ at risk (OAR) were delineatedmanually and a treatment plan was made. The dose constraints were determinedfor the concerned organs according to IROC-H prescription. The treatment planwas optimized using adoptive convolution algorithm to improve dose homogeneityand conformity. The dose calculation was performed using C.C Convolutionalgorithm and a Varian True Beam linear accelerator was used to deliver thetreatment plan to the head and neck phantom. The delivered radiation dose tothe phantom was measured through TLDs and GafChromic EBT2 films. The dosimetricperformance of the VMAT delivery was studied by analysing percent dosedifference, iso-dose line profile and gamma analysis of the TPS computed doseand linac delivered doses.  Result: the percent dose difference of 3.8\% was observed between the plannedand measured doses of TLDs and a 1.5mm distance to agreement (DTA) was observedby comparing iso-dose line profiles. Passed the gamma criteria of 3\%/3 mm waswith good percentages.  Conclusion: The dosimetric performance of VMAT delivery for a challenginghead and neck radiotherapy can be verified using TLDs and films imbedded in ananthropomorphic H\&N phantom.

Dose Verification of Volumetric Modulated Arc Therapy using One and Two Dimensional Dosimeters