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| Dicom |
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| README |
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The DICOM application has been developed by the Geant4 users:
Louis Archambault,*Luc Beaulieu, +Vincent Hubert-Tremblay.
*Centre Hospitalier Universitaire de Quebec (CHUQ),
Hotel-Dieu de Quebec, departement de Radio-oncologie
11 cote du palais. Quebec, QC, Canada, G1R 2J6
tel (418) 525-4444 #6720
fax (418) 691 5268
web : thomson.phy.ulaval.ca/phys_med
+ Université Laval, Québec (QC) Canada
This example illustrates a preliminary version of a Geant4 interface
to the DICOM image format.
The example consists in modeling a phantom inside a Geant4 application,
given the dicom files describing the phantom.
--->1) Introduction
DICOM images are read and used to model the geometry set-up for simulation.
Three file .dcm give the experimental set-up
(in terms of tissues and tissue geometry position) are read.
It is possible to visualise the reproduced experimental
set-up thanks to the use of visualisation packages.
You can find the phantom reproduced in the image PhantomCT.jpg.
In the application the phantom is placed on a table.
---> 2) Installation:
-example enviroment with the compiler 3.2.3
-a standard Geant4 example GNUmakefile is provided
setup with:
compiler = gcc-3.2.3
G4SYSTEM = linux-g++
The following environment variables need to be set:
G4LEDATA: points to low energy data base - G4EMLOW2.3
visualisation package: OpenGL
---> 3) Run the example:
- batch mode:
-dicom vis.mac :the geometry is visualised with OPENGL
-dicom run.mac :no geometry visualisation
- interactive mode:
dicom
the file default.mac is read in order to visualise the phantom.
--->4) Some details :
The DICOM images pixel values represent CT (Hounsfield) numbers and they should be
converted, first, to a given density and then to a material type. The relation between
CT number and density is more or less linear. The one used in this program is represented
in the table below.
#####################################################
# Density Range Material #
#---------------------------------------------------#
# mg/cm3 - #
#---------------------------------------------------#
# [ 0.207 , 0.227 ] Lungs (inhale) #
# [ 0.481 , 0.534 ] Lungs (exhale) #
# [ 0.919 , 0.979 ] Adipose #
# ] 0.979 , 1.004 ] Breast #
# ] 1.004 , 1.043 ] Phantom #
# ] 1.043 , 1.109 ] Liver #
# ] 1.109 , 1.113 ] Muscle #
# ] 1.113 , 1.217 ] Trabecular Bone#
# [ 1.496 , 1.654 ] Dense Bone #
#####################################################
Data taken from the International Commission on Radiation Units and measurements (ICRU)
report 46 was used to build the materials (lung, liver, breast, bones, ...)
5) Contacts
If you have any questions or wish to notify of updates and/or modification
please contact:
*Louis Archambault at louis.archambault@phy.ulaval.ca
*Luc Beaulieu at beaulieu@phy.ulaval.ca
+ Vincent Hubert-Tremblay
<tigre.2@sympatico.ca> or <vihut@phy.ulaval.ca>
*Centre Hospitalier Universitaire de Quebec (CHUQ),
Hotel-Dieu de Quebec, departement de Radio-oncologie
11 cote du palais. Quebec, QC, Canada, G1R 2J6
tel (418) 525-4444 #6720
fax (418) 691 5268
web : thomson.phy.ulaval.ca/phys_med
+ Université Laval, Québec (QC) Canada
Gabriele Cosmo