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VERDICT-AMICO: Ultrafast fitting algorithm for non-invasive prostate microstructure characterization.

Elisenda Bonet-Carne1,2, Edward Johnston1, Alessandro Daducci3,4

  • 1UCL Centre for Medical Imaging, London, UK.

NMR in Biomedicine
|November 1, 2018
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Summary
This summary is machine-generated.

This study introduces VERDICT-AMICO, a faster method for prostate cancer imaging. It significantly reduces computational time for microstructural analysis, enabling quicker and more precise tumor characterization.

Keywords:
AMICOVERDICT MRIcancer imagingdiffusion MRImicrostructure imagingprostate cancerquantitative imaging

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Computational Biology

Background:

  • Diffusion MRI enables non-invasive estimation of tissue microstructural features using VERDICT (vascular, extracellular and restricted diffusion for cytometry in tumours).
  • Current VERDICT model fitting is computationally intensive, posing a challenge for clinical prostate cancer diagnosis.

Purpose of the Study:

  • To accelerate VERDICT parameter estimation for prostate cancer diagnosis.
  • To compare the accuracy, computational time, and reliability of linearized VERDICT fitting (VERDICT-AMICO) against the original non-linear method.

Main Methods:

  • Adapted the AMICO (accelerated microstructure imaging via convex optimization) framework to linearize VERDICT parameter estimation.
  • Quantified accuracy using synthetic data and evaluated computational time, reliability, and repeatability in eight prostate cancer patients.

Main Results:

  • VERDICT-AMICO demonstrated higher accuracy in simulations (SNR 20 dB) and reduced processing time by three orders of magnitude (6.55 s/voxel to 1.78 ms/voxel).
  • Linearized fitting provided more precise parameter estimates, similar parametric maps, and high correlation (r² > 0.7) with the original method.
  • VERDICT-AMICO exhibited high repeatability and allowed estimation of an additional diffusivity parameter without compromising tumor conspicuity.

Conclusions:

  • VERDICT-AMICO significantly accelerates microstructural mapping for prostate cancer characterization.
  • The linearized approach maintains diagnostic utility while drastically improving efficiency, making it suitable for clinical application.