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A Multi-task Learning Approach for Compartmental Model Parameter Estimation in DCE-CT Sequences

  • Blandine Romain
  • Véronique Letort
  • Olivier Lucidarme
  • Laurence Rouet
  • Florence d’Alché-Buc
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8150)

Abstract

Today’s follow-up of patients presenting abdominal tumors is generally performed through acquisition of dynamic sequences of contrast-enhanced CT. Estimating parameters of appropriate models of contrast intake diffusion through tissues should help characterizing the tumor physiology, but is impeded by the high level of noise inherent to the acquisition conditions. To improve the quality of estimation, we consider parameter estimation in voxels as a multi-task learning problem (one task per voxel) that takes advantage from the similarity between two tasks. We introduce a temporal similarity between tasks based on a robust distance between observed contrast-intake profiles of intensity. Using synthetic images, we compare multi-task learning using this temporal similarity, a spatial similarity and a single-task learning. The similarities based on temporal profiles are shown to bring significant improvements compared to the spatial one. Results on real CT sequences also confirm the relevance of the approach.

Keywords

Multi-task learning CT perfusion model parameter estimation 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Blandine Romain
    • 1
    • 2
    • 5
  • Véronique Letort
    • 1
  • Olivier Lucidarme
    • 3
  • Laurence Rouet
    • 2
  • Florence d’Alché-Buc
    • 4
    • 5
  1. 1.MASEcole Centrale ParisChatenay-MalabryFrance
  2. 2.Philips Research, SuresnesFrance
  3. 3.Hospital La Pitie-Salpetriere, AP-HPParisFrance
  4. 4.INRIA-Saclay, LRI CNRS 8623OrsayFrance
  5. 5.IBISCUniversity of EvryEvryFrance

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