Document Details

Document Type : Article In Journal 
Document Title :
A Theoretical Design of a Flattening Filter to Improve Field Uniformity of a SuperficialTherapeutic X-Ray Beam
تصميم نظري لمرشح استوائي لتحسين التماثل الحقلي لجهاز اشعة سينية علاجية سطحية
 
Subject : Physics 
Document Language : English 
Abstract : A Monte Carlo model has been developed using the EGS4 code to aid the design of a flattening filter, to improve field uniformity of a superficial X-ray machine. The machine is operating at 90 kV and filtered with a 1.1 mm aluminium filter. In the theoretical simulation the original flat filter was replaced by a varying thickness filter to improve the uniformity across field sizes 20, 5 and 2 cm diameter as well as hardening the beam. Simulation results showed that flatness of the beam profile was improved for the 20 cm field size from ±7.3% to ±1.1% across the anode/cathode direction, and from ±7.7% to ±3.2% in the anode/cathode direction. For the 5 cm field size the improvement was from ±4.6% to ±3.1% and from ±5.5% to ±3.4%, and for the 2 cm field size from ±3.1% to ±2.4% and from ±10.2% to ±9.5%, in the same directions, respectively. Beam quality simulations were made and the original half-value layer was reduced from 2.21 ± 0.09 mm aluminium to 2.04 ± 0.09 mm aluminium. The study demonstrated that it was possible to build a filter capable of flattening the beam profile for different sized applicators without significantly changing the penetrating ability of the beam. 
ISSN : 1012-1319 
Journal Name : Science Journal 
Volume : 13 
Issue Number : 1 
Publishing Year : 1421 AH
2001 AD 
Number Of Pages : 13 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
فائز حماد حمود الغريبيFAYEZ H. H. AL-GHORABIEResearcher  

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