DICOM Extended Example

The DICOM application has been originally developed by the Geant4 users:

  • Louis Archambault, Luc Beaulieu, Centre Hospitalier Universitaire de Quebec (CHUQ), Hotel-Dieu de Quebec, departement de Radio-oncologie, and
  • Vincent Hubert-Tremblau, Université Laval, Québec (QC) Canada

Since 2007 the example has been reviewed by Pedro Arce, Stephane Chauvie and Jonathan Madsen of the Geant4 Collaboration. Currently the example is maintained by Pedro Arce.


This example serves first to convert a DICOM file to a simple ASCII file, where the Hounsfield numbers are converted to materials and densities so that it can be used by GEANT4. It serves also to create a GEANT4 geometry based on the DICOM file information using the G4PhantomParameterisation.

The example simulate a simple monenergetic electron beam inside the patient. The output of the example is a 3D dose (Gy) deposited inside the patient.

The example is located in the geant4/examples/extended/medical/DICOM tree.

The following files can be found in the DICOM directory:

File Content
Data.dat it contains the input information for reading DICOM files
dicom.cc main
PhantomCT.jpg image of the phantom used for CT calibration, that is the same of the DICOM images
vis.mac macro file for visualisation using OpenGL
Colourmap.dat it defines the colour of the different DICOM materials
README information on how to run the example (Read it first!!!)
CT2Density.dat calibration of HU into materials using the phantom used for CT calibration
run.mac macro for batch mode

Recent developments:

  • A new way to read DICOM files has been implemented since release 10.3, to avoid the often problems found by users when reading DICOM files. It can also read RT structures in DICOM format as well as RT plans. This utility uses the DCMTK (http://dicom.offis.de/dcmtk.php.en).

  • A new DICOM Digital Head included by S. Guatelli (susanna@uowNOSPAMPLEASE.edu.au) and V. Giacometti. This DICOM project is released within Geant4 since Geant4 10.4. The Digital model is documented in: Giacometti, V., Guatelli, S., Bazalova-Carter, M., Rosenfeld, A.B., Schulte, R.W., "Development of a high resolution voxelised head phantom for medical physics applications", (2017) Physica Medica, 33, pp. 182-188.

extendedexamplesDICOM.jpg head_phantom.png
Monoenergetic 6 MeV electron beam incident on a phantom
modelised with the DICOM extended example
DICOM HEAD project released with the extended example, documented in Physica Medica, 33, pp. 182-188, 2017.

Topic attachments
I Attachment History Action Size Date Who Comment
JPEGjpg ct-thorax.jpg r1 manage 208.0 K 2010-01-07 - 12:52 StephaneChauvie Monoenergetic beam of 6 MeV electrons impinging on a Patient's thorax modelised with the DICOM interface of the DICOM extended example
PNGpng head_phantom.png r1 manage 78.1 K 2019-09-10 - 05:48 SusannaGuatelli The DICOM HEAD study released within the Geant4 DICOM extended example.
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Topic revision: r10 - 2019-09-10 - SusannaGuatelli
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