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Quality assurance of volumetric-modulated arc therapy head and neck cancer treatment using PRESAGE® dosimeter

Published online by Cambridge University Press:  16 July 2018

Jalil ur Rehman ,
Muhammad Isa ,
Nisar Ahmad ,
H. M. Noor ul Huda Khan Asghar ,
Zaheer A. Gilani ,
James C. L. Chow ,
Muhammad Afzal  and
Geoffrey S. Ibbott
Jalil ur Rehman*
Affiliation:
Department of Physics, Balochistan University of Information Technology, Engineering & Management Sciences, Quetta, Pakistan Department of Physics, The Islamia University of Bahawalpur, Bahawalpur, Pakistan The University of Texas MD Anderson Cancer Center, Houston, TX, USA
Muhammad Isa
Affiliation:
Department of Physics, Hafiz Hayat Campus University of Gujrat, Gujrat, Pakistan
Nisar Ahmad
Affiliation:
Department of Physics, Balochistan University of Information Technology, Engineering & Management Sciences, Quetta, Pakistan
H. M. Noor ul Huda Khan Asghar
Affiliation:
Department of Physics, Balochistan University of Information Technology, Engineering & Management Sciences, Quetta, Pakistan
Zaheer A. Gilani
Affiliation:
Department of Physics, Balochistan University of Information Technology, Engineering & Management Sciences, Quetta, Pakistan
James C. L. Chow
Affiliation:
Princess Margaret Cancer Centre, Toronto, ON, Canada
Muhammad Afzal
Affiliation:
Department of Physics, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
Geoffrey S. Ibbott
Affiliation:
The University of Texas MD Anderson Cancer Center, Houston, TX, USA
*
Author for correspondence: Jalil ur Rehman, Department of Physics, Balochistan University of Information Technology, Engineering & Management Sciences, Quetta 87300, Pakistan. E-mail: [email protected]
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Abstract

Background

Accurate three-dimensional dosimetry is essential in modern radiotherapy techniques such as volumetric-modulated arc therapy (VMAT) and intensity-modulated radiation therapy (IMRT). In this research work, the PRESAGE® dosimeter was used as quality assurance (QA) tool for VMAT planning for head and neck (H&N) cancer.

Material and method

Computer tomography (CT) scans of an Image Radiation Oncology Core (IROC) H&N anthropomorphic phantom with both IROC standard insert and PRESAGE® insert were acquired separately. Both CT scans were imported into the Pinnacle (9.4 version) TPS for treatment planning, where the structures [planning target volume (PTV), organs at risk) and thermoluminescent detectors (TLDs) were manually contoured and used to optimise a VMAT plan. Treatment planning was done using VMAT (dual arc: 182°–178°, 178°–182°). Beam profile comparisons and gamma analysis were used to quantify agreement with film, PRESAGE® measurement and treatment planning system (TPS) calculated dose distribution.

Results

The average ratio of TLD measured to calculated doses at the four PTV locations in the H&N phantom were between 0·95 to 0·99 for all three VMAT deliveries. Dose profiles were taken along the left–right, the anterior–posterior and superior–inferior axes, and good agreement was found between the PRESAGE® and Pinnacle profile. The mean value of gamma results for three VMAT deliveries in axial and sagittal planes were found to be 94·24 and 93·16% when compared with film and Pinnacle, respectively. The average values comparing the PRESAGE® results and dose values calculated on Pinnacle were observed to be 95·29 and 94·38% in the said planes, respectively, using a 5%/3 mm gamma criteria.

Conclusion

The PRESAGE® dose measurements and calculated dose of pinnacle show reasonable agreement in both axial and sagittal planes for complex dual arc VMAT treatment plans. In general, the PRESAGE® dosimeter is found to be a feasible QA tool of VMAT plan for H&N cancer treatment.

Keywords

EBT filmimaging radiation oncology corePinnaclePRESAGE®volumetric-modulated arc therapy
Type
Technical Note
Information
Journal of Radiotherapy in Practice , Volume 17 , Issue 4 , December 2018 , pp. 441 - 446
Copyright
© Cambridge University Press 2018 

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