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Development and evaluation of a Perspex anthropomorphic head and neck phantom for three dimensional conformal radiation therapy (3D-CRT)

Published online by Cambridge University Press:  22 April 2013

Khaldoon M. Radaideh ,
Laila M. Matalqah ,
A. A. Tajuddin ,
W. I. Fabian Lee ,
S. Bauk  and
E. M. Eid Abdel Munem
Khaldoon M. Radaideh*
Affiliation:
School of Medical Imaging and Radiotherapy, Allianze University College of Medical Sciences (AUCMS), Kepala Batas, Penang, Malaysia School of Physics, Universiti Sains Malaysia, Penang, Malaysia
Laila M. Matalqah
Affiliation:
School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia School of Pharmacy, Allianze University College of Medical Sciences (AUCMS), Kepala Batas, Penang, Malaysia
A. A. Tajuddin
Affiliation:
School of Physics, Universiti Sains Malaysia, Penang, Malaysia Advanced Medical and Dental Institute, Universiti Sains Malaysia, Kepala Batas, Penang, Malaysia
W. I. Fabian Lee
Affiliation:
Department of Radiotherapy and Oncology, Mount Miriam Cancer Hospital, Jalan Bulan, Penang, Malaysia
S. Bauk
Affiliation:
Physics Section, School of Distance Education, Universiti Sains Malaysia, Minden, Penang, Malaysia
E. M. Eid Abdel Munem
Affiliation:
School of Physics, Universiti Sains Malaysia, Penang, Malaysia
*
Correspondence to: Dr Khaldoon M. Radaideh, School of Medical Imaging and Radiotherapy, Allianze University College of Medical Sciences (AUCMS), 13200, Kepala Batas, Penang, Malaysia. Tel: 0060175041614. Fax: 0060145780840. E-mail: [email protected]
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Abstract

Purposes

To design, construct and evaluate an anthropomorphic head and neck phantom for the dosimetric evaluation of 3D-conformal radiotherapy (3D-CRT) dose planning and delivery, for protocols developed by the Radiation Therapy Oncology Group (RTOG).

Materials and methods

An anthropomorphic head and neck phantom was designed and fabricated using Perspex material with delineated planning target volumes (PTVs) and organs at risk (OARs) regions. The phantom was imaged, planned and irradiated conformally by a 3D-CRT plan. Dosimetry within the phantom was assessed using thermoluminescent dosimeters (TLDs). The reproducibility of phantoms and TLD readings were checked by three repeated identical irradiations. Subsequent three clinical 3D-CRT plans for nasopharyngeal patients have been verified using the phantom. Measured doses from each dosimeter were compared with those acquired from the treatment planning system (TPS).

Results

Phantom's measured doses were reproducible with <3·5% standard deviation between the three TLDs’ repeated measurements. Verification of three head and neck 3D-CRT patients’ plans was implemented, and good agreement between measured values and those predicted by TPS was found. The percentage dose difference for TLD readings matched those corresponding to the calculated dose to within 4%.

Conclusion

The good agreement between predicted and measured dose shows that the phantom is a useful and efficient tool for 3D-CRT technique dosimetric verification.

Keywords

anthropomorphic head and neck Phantom3D-CRTthermoluminescent dosimeter
Type
Technical Note
Information
Journal of Radiotherapy in Practice , Volume 12 , Issue 3 , September 2013 , pp. 272 - 280
Copyright
Copyright © Cambridge University Press 2013 

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