Annals of Biomedical Engineering

, Volume 41, Issue 1, pp 100–111 | Cite as

An Inverse Problem Approach to Recovery of In Vivo Nanoparticle Concentrations from Thermal Image Monitoring of MR-Guided Laser Induced Thermal Therapy

  • D. Fuentes
  • A. Elliott
  • J. S. Weinberg
  • A. Shetty
  • J. D. Hazle
  • R. J. Stafford


Quantification of local variations in the optical properties of tumor tissue introduced by the presence of gold–silica nanoparticles (NP) presents significant opportunities in monitoring and control of NP-mediated laser induced thermal therapy (LITT) procedures. Finite element methods of inverse parameter recovery constrained by a Pennes bioheat transfer model were applied to estimate the optical parameters. Magnetic resonance temperature imaging (MRTI) acquired during a NP-mediated LITT of a canine transmissible venereal tumor in brain was used in the presented statistical inverse problem formulation. The maximum likelihood (ML) value of the optical parameters illustrated a marked change in the periphery of the tumor corresponding with the expected location of NP and area of selective heating observed on MRTI. Parameter recovery information became increasingly difficult to infer in distal regions of tissue where photon fluence had been significantly attenuated. Finite element temperature predictions using the ML parameter values obtained from the solution of the inverse problem are able to reproduce the NP selective heating within 5 °C of measured MRTI estimations along selected temperature profiles. Results indicate the ML solution found is able to sufficiently reproduce the selectivity of the NP mediated laser induced heating and therefore the ML solution is likely to return useful optical parameters within the region of significant laser fluence.


Bioheat transfer Laser induced thermal therapy Statistical inverse Nanoparticle selective heating MR temperature imaging PDE constrained optimization 


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Copyright information

© Biomedical Engineering Society 2012

Authors and Affiliations

  • D. Fuentes
    • 1
  • A. Elliott
    • 1
  • J. S. Weinberg
    • 2
  • A. Shetty
    • 3
  • J. D. Hazle
    • 1
  • R. J. Stafford
    • 1
  1. 1.Department of Imaging PhysicsThe University of Texas M.D. Anderson Cancer CenterHoustonUSA
  2. 2.Department of NeurosurgeryThe University of Texas M.D. Anderson Cancer CenterHoustonUSA
  3. 3.BioTex, Inc.HoustonUSA

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