Validation of the RapidArc delivery system using a volumetric phantom as per task group report 119 of the American association of physicists in medicine

This study was designed to investigate the dosimetric difference between intensitymodulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) in head and neck cancer (HNC). The study primarily focuses on low-dose spillage evaluation between these two techniques.Methods: This retrospective study involved 45 patients with HNC. The treatment plans were generated using the IMRT and VMAT techniques for all patients. Dosimetric comparisons were performed in terms of target coverage, organ-at-risk (OAR) sparing, and various parameters, including conformity index, uniformity index, homogeneity index, conformation number, low-dose volumes, and normal tissue integral dose (NTID).Results: No significant (P>0.05) difference in planning target volume coverage (D 95% ) was observed between IMRT and VMAT plans for supraglottic larynx, hard palate, and tongue cancers. A decrease in dose volumes ranging from 1 Gy to 30 Gy was observed for VMAT plans compared with those for IMRT plans, except for V 1Gy and V 30Gy for supraglottic larynx cancer and V 1Gy for tongue cancer. Moreover, decreases (P<0.05) in NTID were observed for VMAT plans compared with that for IMRT plans in supraglottic larynx (4.50%), hard palate (12.80%), and tongue (7.76%) cancers. In contrast, a slight increase in monitor units for VMAT compared with those for IMRT in supraglottic larynx (0.46%), hard palate (2.54%), and tongue (7.56%) cancers. Conclusions:For advanced-stage HNC, both IMRT and VMAT offer satisfactory clinical plans.VMAT offers a conformal and homogeneous dose distribution with comparable OAR sparing and higher dose falloff outside the target volume than IMRT, which provides an edge to reduce the risk of secondary malignancies for HNC over IMRT.

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Validation of the RapidArc delivery system using a volumetric phantom as per task group report 119 of the American association of physicists in medicine

Cited by 10 publications

References 29 publications

Design and fabrication of a thoracic phantom for radiation dose verification in mega-voltage X-ray beam

Design and fabrication of a thoracic phantom for radiation dose verification in mega-voltage X-ray beam

Design and fabrication of indigenous multi-rotational thorax phantom for patient-specific quality assurance of IMRT and VMAT

Dosimetric Evaluation of Low-Dose Spillage Volumes for Head and Neck Cancer Using Intensity-Modulated Radiation Therapy and Volumetric Modulated Arc Therapy Treatment Techniques

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