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KMID : 1164220030150010041
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Journal of Korean Society for Radiotherapeutic Technology
2003 Volume.15 No. 1 p.41 ~ p.52
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The usefulness of Forward IMRT for Head and Neck Cancer
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Back Geum-Mun
Kim Jeong-Man
Kim Dae-Sup
Park Kwang-Ho
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Abstract
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Purpose : The dose distribution in normal tissues and target lesions is very important in the treatment planning. To make the uniform dose distribution in target lesions, many methods has been used. Especially in the head and neck, the dose inhomogeneity at the skin surface should be corrected. Conventional methods have a limitation in delivering the enough doses to the planning target volume (PTV) with minimized dose to the parotid gland and spinal cord. In this study, we investigated the feasibility and the practical QA methods of the forward IMRT.
Material and Methods : The treatment plan of the forward IMRT with the partial block technique using the dynamic multi-leaf collimator (dMLC) for the patients with the nasopharyngeal cancer was verified using the dose volume histogram (DVH). The films and pinpoint chamber were used for the accurate dose verification.
Results : As a result of verifying the DVH for the 2-D treatment plan with the forward IMRT, the dose to the both parotid gland and spinal cord were reduced. So the forward IMRT could save the normal tissues and optimize the treatment. Forward IMRT can use the 3-D treatment planning system and easily assure the quality, so it is easily accessible comparing with inverse IMRT
Conclusion : The forward IMRT could make the uniform dose in the PTV while maintaining under the tolerance dose in the normal tissues comparing with the 2-D treatment.
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KEYWORD
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forwardIMRT, dynamic MLC, dose distribution, Nasopharyngeal cancer
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