My Master Project

ZUBAL Phantom

MCNP Plotter

1-Abstract:

 

Papers published by study groups about involving MC (Mont Carlo calculation) in TPSs (treatment planning systems) verification, and converting human phantoms to MCNP format have been reviewed. Software has been written to convert ZUBA head phantom into MCNP format.  The major components of a 10&6MV Varian-LINAC 2100C\D have been simulated for two field sizes, 10 by 10, and 5 by 5 cm2, and the geometry has been commissioned by comparing the PDD and beam profiles at different depths with the measured data. 

After that, the phantom has been inserted into the LINAC geometry, and an AP (anterior posterior) beam with 100 cm SSD, and 5 by 5 cm2 field size has been applied on the phantom front head. A GUI (graphical user inter face) has been programmed by MATLAB to view the dose distribution, and the iso-dose lines calculated by MCNP.

 

 The modified ZUBAL head phantom whish has been used in MCNP has been converted from material based voxels to CT numbers based voxel, and entered in “plan UNC” treatment planning software developed in the University of North Carolina.

And the same MCNP plan has been applied to the head, with the same beam parameters, and the result has been graphically compared.

Master project Objectives:

 

· Designing software that can convert human phantom such as ZUBAL phantom into a format hat can be read by MCNP5.

· Using the software to build a cube that consists of voxels 30*30*30 cm3, with a voxel volume of 0.5*0.5*0.5 cm3.

· Using this cube to commission LINAC beam geometry by obtaining the PDD and beam profile using MATLAB.

· Inserting the phantom into these voxels.

· Obtaining the dose distribution in the phantom slices using MATLAB (a GUI showing the anatomy with the iso-dose lines for both transverse and coronal cross sections).

· Converting to phantom into CT slices DICOM format, and re enter it in Plan-UNC (TPS).

· Compare between dose distributions generated by MCNP, and Plan-UNC.

ZUBAL phantom Dosimetry using Plan-UNC TPS and MCNP

Course Advisor : Dr. Nabil Maalej

Associated  professor at KFUPM, Physics DEPT