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KMID : 1164220020140010109
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Journal of Korean Society for Radiotherapeutic Technology
2002 Volume.14 No. 1 p.109 ~ p.116
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Dosimetric characteristics of an independent collimator system using measurements performed quarter fields
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Kim Gun-Oh
Chung Se-Young
Kim Young-Bum
Kweon Young-Ho
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Abstract
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The mordem linear accelerators are equipped with X-ray collimators that can be moved independently to allow asymmetric fields with field centers positioned away from the true central axis of the beam. We have studied the dosimetric of an independent collimator system using measurements performed quarter fields. The field size factors for asymmetric fields are compared to those for symmetric fields. Dosimetric measurements include portent depth don, beam penumbra and shape of isodose curves for symmetric and quarter fields.
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