TestDose: A SPECT image generator for clinical dosimetry studies

M.-P. Garcia, H. Der Sarkissian, E. McKay, L. Ferrer, M. Bardiès, D. Villoing, H. Batatia, A. Basarab, J.-Y. Tourneret, D. Kouamé

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Patient-specific dosimetry in nuclear medicine relies on activity quantification in volumes of interest from scintigraphic imaging. Clinical dosimetry protocols have to be benchmarked against results computed from test phantoms. The design of an adequate model is a crucial step for the validation of image-based activity quantification. We propose a computing platform to automatically generate simulated SPECT images from a dynamic phantom for arbitrary scintigraphic image protocols. As regards the image generation, we first use the open-source NCAT phantom code to generate an anatomical model and 3D activity maps for different source compartments. This information is used as input for an image simulator and each source is modelled separately. Then, a compartmental model is designed, which describes interactions between different functional compartments. As a result, we can derive time-activity curves for each compartment with sampling time determined from real image acquisition protocols. Finally, to get an image at a given time after radionuclide injection, the resulting projections are aggregated by scaling the compartment contribution using the specific pharmacokinetics and corrupted by Poisson noise. Our platform consists of many software packages, either in-house developments or open-source codes. In particular, an important part of our work has been to integrate the GATE simulator in our platform, in order to generate automatically the command files needed to run a simulation. Furthermore, some developments were added in the GATE code, to optimize the generation of projections with multiple energy windows in a minimum computation time.

Original languageEnglish
Title of host publicationMedical Imaging 2013
Subtitle of host publicationPhysics of Medical Imaging
PublisherSPIE
ISBN (Print)9780819494429
DOIs
Publication statusPublished - 6 Mar 2013
EventMedical Imaging 2013: Physics of Medical Imaging - Lake Buena Vista, United States
Duration: 11 Feb 201314 Feb 2013

Publication series

NameProceedings of SPIE
Volume8668
ISSN (Print)1605-7422

Conference

ConferenceMedical Imaging 2013: Physics of Medical Imaging
CountryUnited States
CityLake Buena Vista
Period11/02/1314/02/13

Keywords

  • GATE
  • Monte carlo simulation
  • Nuclear medicine
  • SPECT

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

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