Determining material properties of the breast for image-guided surgery

Timothy J. Carter; Christine Tanner; David J. Hawkes

doi:10.1117/12.810092

13 March 2009 Determining material properties of the breast for image-guided surgery

Timothy J. Carter, Christine Tanner, David J. Hawkes

Proceedings Volume 7261, Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling; 726124 (2009) https://doi.org/10.1117/12.810092
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

We have previously proposed a system for image-guided breast surgery that compensates for the deformation of the breast during patient set-up. Since breast surgery is performed with the patient positioned supine, but MR imaging is performed with the patient positioned prone, a large soft tissue deformation must be accounted for. A biomechanical model can help to constrain the associated registrations. However the necessary material properties for breast tissue under such strains are not available in the literature. This paper describes a method to determine these properties. We first show that the stress-free or 'reference' state of an object can be approximated by submerging it in liquid of a similar density. MR images of the breast submerged in water and in a pendulous prone position are acquired. An intensity-based non-rigid image registration algorithm is used to establish point-by-point correspondence between these images. A finite element model of the breast is then constructed from the submerged images and the deformation to free-pendulous is simulated. The material properties for which the model deformation best fits the observed deformation are determined. Assuming neo-Hookean material properties, the initial shear moduli of fibroglandular and adipose tissue are found to be 0.4 kPa and 0.3 kPa respectively.

Citation Download Citation

Timothy J. Carter, Christine Tanner, and David J. Hawkes "Determining material properties of the breast for image-guided surgery", Proc. SPIE 7261, Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling, 726124 (13 March 2009); https://doi.org/10.1117/12.810092

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