Paper Information

Journal:   IRANIAN JOURNAL OF MEDICAL PHYSICS   FALL 2013-WINTER 2014 , Volume 10-11 , Number 1-4; Page(s) 195 To 204.
 
Paper: 

ELECTRON BEAM DOSE DISTRIBUTION IN THE PRESENCE OF NON-UNIFORM MAGNETIC FIELD

 
 
Author(s):  TAHMASEBI BIRGANI MOHAMAD JAVAD, BAYATIANI MOHAMAD REZA*, SEIF FATEMEH, ZABIHZADEH MANSUR, SHAHBAZIAN HOJATOLAH
 
* RADIOTHERAPY AND MEDICAL PHYSICS DEPARTMENT OF ARAK UNIVERSITY OF MEDICAL SCIENCES AND KHANSARI HOSPITAL, ARAK, IRAN
 
Abstract: 

Introduction:
Magnetic fields are capable of altering the trajectory of electron beams andcan be used in radiation therapy. Theaim of this study was to produce regions with dose enhancement and reduction in the medium.
Materials and Methods:
The NdFeB permanent magnets were arranged on the electron applicator in several configurations. Then, after the passage of the electron beams (9 and 15 MeV Varian 2100C/D) through the non-uniform magnetic field, the Percentage Depth Dose (PDDs) on central axis and dose profiles in three depths for each energy were measured in a 3D water phantom.
Results:
For all magnet arrangements and for two different energies, the surface dose increment and shift in depth of maximum dose (dmax) were observed. In addition, the pattern of dose distribution in buildup region was changed. Measurement of dose profile showed dose localization and spreading in some other regions.
Conclusion:
The results of this study confirms that using magnetic field can alter the dose deposition patterns and as a result can produce dose enhancement as well as dose reduction in the medium using high-energy electron beams. These effects provide dose distribution with arbitrary shapes for use in radiation therapy.

 
Keyword(s): ELECTRON BEAM, MAGNETIC FIELD, RADIATION THERAPY
 
References: 
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