Iterative simulations to estimate the elastic properties from a series of MRI images followed by MRI-US validation

Francesco Visentin (Corresponding Author), Vincent Groenhuis, Bogdan Maris, Diego Dall'Alba, Françoise Siepel, Stefano Stramigioli, Paolo Fiorini

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    Abstract

    The modeling of breast deformations is of interest in medical applications such as image-guided biopsy, or image registration for diagnostic purposes. In order to have such information, it is needed to extract the mechanical properties of the tissues. In this work, we propose an iterative technique based on finite element analysis that estimates the elastic modulus of realistic breast phantoms, starting from MRI images acquired in different positions (prone and supine), when deformed only by the gravity force. We validated the method using both a single-modality evaluation in which we simulated the effect of the gravity force to generate four different configurations (prone, supine, lateral, and vertical) and a multi-modality evaluation in which we simulated a series of changes in orientation (prone to supine). Validation is performed, respectively, on surface points and lesions using as ground-truth data from MRI images, and on target lesions inside the breast phantom compared with the actual target segmented from the US image. The use of pre-operative images is limited at the moment to diagnostic purposes. By using our method we can compute patient-specific mechanical properties that allow compensating deformations.
    Original languageEnglish
    Pages (from-to)913-924
    Number of pages12
    JournalMedical & biological engineering & computing
    Volume57
    Issue number4
    Early online date27 Nov 2018
    DOIs
    Publication statusPublished - Apr 2019

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