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Scientific Publishing Center
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 Type
Dr Grade
Email
فائز حماد حمود الغريبي
FAYEZ H. H. AL-GHORABIE
Researcher
Files
File Name
Type
Description
22537.pdf
pdf
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