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None Medical imaging 

Keywords: Medical imaging
Forum: Documentation and Examples
Date: 23 Jul, 2003
From: Martin Scheelke <Martin Scheelke>


We (Scannex, University of Cape Town – Department of Biomedical Engineering) are working on the simulation of a medical slot scanning x-ray machine. The goal of the simulation is to create a tool which can be used to optimize the design of the x-ray machine imaging subsystem. The subsystem of interest consists of a tungsten target source, filtration, parallel plate collimator, patient, scintillating detector.

        The design parameters of interest include:

Collimator material

Collimator geometry

Source kV’s, mA

Filtration material e.g Aluminium, Rhodium

Filtration thickness

Detector type and geometry Etc....

         Results of interest include:

Scatter to primary ratio

Delivered dose in the patient

Photon flux distribution at the detector

We are at present evaluating the suitability of the GEANT package for this type of simulation. We envision the simulation to proceed using an input spectrum generated by (for example) the method of Boone (Boone, 1997), a simple geometry and material specification of the subsystem and a simple phantom model of the patient. The material specs for the phantom model will most likely come from ICRU report 44 (Tissue substitutes in radiation Dosimetry and Measurement).

Our questions are:

1)What is the accuracy of GEANT photon transport in the energy range 20-150 keV? i.e. Do we need to import special physics list etc…?

2)Has GEANT been used before in medical imaging simulations?

3)Does anyone in the GEANT collaboration have any comments or pointers?


Martin Scheelke

References: John M. Boone and J. Anthony Seibert, “An accurate method for computer-generating tungsten anode x-ray spectra from 30 to 140 kV”, Med. Phys. 24 (11), November 1997

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