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KMID : 1164219990110010073
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Journal of Korean Society for Radiotherapeutic Technology
1999 Volume.11 No. 1 p.73 ~ p.78
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The Dosimetric evaluation of the standard electron cone for the extended cone for the extended SSD and The Dosimetric characteristics of the custom-made electron cone
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Chung Se-Young
Kim Young-Bum
Kwoen Young-Ho
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Abstract
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In general, the patients of the head and neck cancer are treated with 4MV photon beam up to prescribed dose, but spinal cord should be excluded in the treatment field. When its absorbed dose is limited at the tolerance dose. In case of the patients who has the positive posterior neck nodes need a boost electron beam treatment to the prescribed dose. In that case, the anatomical structure of the neck and the physical structure of the standard electron cone interrupt to allow proper access to the disease site. Therefore, we extended treatment SSD for the remove of the those hindrances. In this study, we evaluated the dosimetric variation of the standard electron cone for the extended SSD, from 100cm to 120cm, 5 cm increment, and compare to the custom-made electron cone. As a result, the depth dose, the point of maximum dose and the range of maximum were changed within the . The penumbra width was increased from 1.0cm to 2.0cm. However, the dosimetric characteristics of the custom-made electron cone was very similar to that of the 100cm SSD standard electron cone and due to its characteristic of physical structure, patients didn’t need re-positioning after photon beam treatment, therefore accurate treatment was possible, we conclude that the custom-made electron cone was very useful for the clinical practice.
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KEYWORD
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extended SSD, standard electron cone, custom-made electron cone
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