|
KMID : 1164220070190020077
|
|
Journal of Korean Society for Radiotherapeutic Technology
2007 Volume.19 No. 2 p.77 ~ p.82
|
|
|
A Study of Peripheral Doses for Physical Wedge and Dynamic Wedge
|
|
Min Je-Sun
Na Kyoung-Su
Lee Je-Hee
Park Heung-Deuk
|
|
|
Abstract
|
|
|
Purpose: This study investigates peripheral dose from physical wedge and dynamic wedge system on a multileaf collimator (MLC) equipment linear accelerator.
Materials and Methods: Measurments were performed using a 2D array ion chamber and solid water phantom for a 1010 cm, source-surface distance (SSD) 90 cm, 6 and 15 MV photon beam at depths of 0.5 cm, 5 cm through dmax. Measurments of peripheral dose at 0.5 cm and 5 cm depths were performed from 1 cm to 5 cm outside of fields for the dynamic wedge and physical wedge 15, 45. Dose profiles normalized to dose at the maximum depth.
Results: At 6 MV photon beam, the average peripheral dose of dynamic wedge were lower by 1.4% and 0.1%. At 15 MV photon beam, the peripheral dose of dynamic wedge were lower by maximum 1.6%.
Conclusion: This study showed that dynamic wedge can reduce scattered dose of clinical organ close to the field edge and reduced treatment time. The wedge systems produce significantly different peripheral dose that should be considered in properly choosing a wedge system for clinical use.
|
|
|
KEYWORD
|
|
|
physical wedge, dynamic wedge, peripheral dose
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|
|