On the importance of modelling organ geometry and boundary conditions for predicting three-dimensional prostate deformation

Alex Jahya, Martijn G. Schouten, Jurgen J. Fütterer and Sarthak Misra

Computer Methods in Biomechanics and Biomedical Engineering, 2014, vol. 17, issue 5, 497-506

Abstract: The use of an ultrasound probe or a needle guide during biopsy deforms both the rectal wall and the prostate, resulting in lesion motion. An accurate patient-specific finite element (FE)-based biomechanical model can be used to predict prostate deformations. In this study, an FE model of a prostate phantom is developed using magnetic resonance images, while soft-tissue elasticity is estimated in vivo using an ultrasound-based acoustic radiation force impulse imaging technique. This study confirms that three-dimensional FE-predicted prostate deformation is predominantly dependent on accurate modelling of prostate geometry and boundary conditions. Upon application of various compressive displacements, our results show that a linear elastic FE model can accurately predict prostate deformations. The maximum global error between FE-predicted simulations and experimental results is 0.76 mm. Moreover, the effect of including the urethra, puboprostatic ligament and urinary bladder on prostate deformations is investigated by a sensitivity study.

Date: 2014
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DOI: 10.1080/10255842.2012.694876

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