Quality assurance and dosimetric analysis of intensity modulation radiotherapy using compensators for head and neck cancers

• Authors: Atul Tyagi , Sapna Nangia , Kundan Chufal , Maninder Mishra , Dhananjay Ghosh , Sanjay Supe , Man Singh
• Languages of publication: EN

Abstracts

EN

In this study we describe our experience in implementing compensator based intensity modulated radiotherapy (cIMRT) for head and neck cancer with regard to pre treatment quality assurance (QA), dosimetric parameters and other technical detail.This study represents the analysis of initial 48 patients who underwent cIMRT for head and neck cancers. All patients were treated with pre treatment QA in terms of point dose with ion chamber and spatial dose comparison with film dosimetry.In our study for all 48 patients, compensators revealed a deviation in central axis dose of 2% ± 1.8% in terms of cumulative calculated versus measured dose. Target coverage for high dose volume (70 Gy) was adequate in terms of volume receiving 93% and 95% of the prescription dose, which was 98.5% and 97.5% respectively. Parotid and other critical organs were spared adequately. Contralateral parotid (CLP) was spared. V30 Gy and V35 Gy was 55.9% and 36.8% for CLP and average dose was 31.7 Gy. Median variation in cumulative measured dose versus cumulative calculated dose was 1.8% (SD + 1.8) and mean variation was 2.5% (95%CI 1.5, 2.6). Range was 0 to 7%.cIMRT is practically feasible. Our QA tests revealed high degree of concordance between cumulative measured doses versus cumulative calculated doses. All dosimetric parameters were within acceptable limits. The manufacturing of compensator is cumbersome but it is a one time job followed by easy treatment delivery and simple QA procedure, high monitor unit (MU) efficiency and less treatment time. cIMRT is easy to implement and now can be applied to larger number of patients with different type of tumor.

Keywords

EN

Compensator; IMRT; Quality Assurance; Dosimetry; Head and neck

• Publisher: Versita
• Journal: Polish Journal of Medical Physics And Engineering
• Year: 2009
• Volume: 15
• Issue: 4
• Pages: 193-208

Dates

published

1 - 1 - 2009

online

22 - 9 - 2010

Contributors

author

Atul Tyagi

author

Sapna Nangia

• Department of Oncology, Batra Hospital and Medical Research Center, New Delhi, India

author

Kundan Chufal

• Department of Oncology, Batra Hospital and Medical Research Center, New Delhi, India

author

Maninder Mishra

• Department of Oncology, Batra Hospital and Medical Research Center, New Delhi, India

author

Dhananjay Ghosh

• Department of Oncology, Batra Hospital and Medical Research Center, New Delhi, India

author

Sanjay Supe

• Department of Radiation Physics, Kidwai Memorial Institute of Oncology, Bangalore, Karnataka, India

author

Man Singh

• Department of Physics, MMH College, Ghaziabad, Uttar Pradesh, India

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Identifiers

DOI

10.2478/v10013-009-0019-3