Journal of Medical Physics
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Year : 2020  |  Volume : 45  |  Issue : 3  |  Page : 168-174

Gradient based elastic property reconstruction in digital image correlation elastography

Department of Mechanical Engineering, University of Sherbrooke, Sherbrooke, Quebec J1L 2R1, Canada

Correspondence Address:
Dr. Alexandre Brazy
134A rue du Conseil, Sherbrooke, Québec J1G 1H8
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jmp.JMP_99_19

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Aim: A Conjugate Gradient implementation of the Digital Image Correlation Elastography method is presented. Method: The gradient is calculated using the adjoint method, requiring only two forward solutions regardless of the number of mechanical properties to reconstruct. A power-law based multi-frequency viscoelastic model is used to relate the reconstructed mechanical properties and the Digital Image Correlation surface displacement measurements. Result: The method is tested against harmonic surface motion fields generated through numerical simulation and measured on a silicon phantom. Conclusion: Reconstruction results show the ability of the gradient reconstruction method to detect stiff internal inclusions in simulated and phantom data.

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