The Experimental Assessment Of Build Up Factor And Attenuation Coefficient Of Brass Compensator Applied In Intensity-Modulated Radiation Therapy (Imrt) For 6mv Photon Beam
Journal of University of Malaya Medical Centre
;
: 26-30, 2017.
Article
in English
| WPRIM
| ID: wpr-732129
ABSTRACT
Introduction:
Recent compensators are commonly applied in IMRT. The precise properties of applied compensators such as thickness, attenuation coefficient and build up factor are intensively important for IMRT calculations.Method:
The brass compensator used for 6 MV photon beam was studied to estimate the relative effect of thickness and field size on IMRT calculations. Various field size together with several compensator thicknesses were examined.Result:
The average reduction of effective attenuation coefficient (EAC), for the fields of 10×10 cm2 to 20×20 cm2, was 9.94%. By increasing the field size, EAC was decreased. The major reduction of EAC due to increasing field size was found to be 9.62%. The build up factor was increased by 2% to 21.8% respect to field size and compensator thickness. Also, the build up factor was increased by adding up the thickness. The rate of changes ranged from 24% to 48 %.Conclusion:
The compensator thickness and field size are significantly important to calculate the effective attenuation coefficient and build up facto
Full text:
Available
Index:
WPRIM (Western Pacific)
Language:
English
Journal:
Journal of University of Malaya Medical Centre
Year:
2017
Type:
Article
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