Modeling of needle-tissue interaction using ultrasound-based motion estimation.
A needle-tissue interaction model is an essential part of every needle insertion simulator. In this paper, a new experimental method for the modeling of needle-tissue interaction is presented. The method consists of measuring needle and tissue displacements with ultrasound, measuring needle base forces, and using a deformation simulation model to identify the parameters of a needle-tissue interaction model. The feasibility of this non-invasive approach was demonstrated in an experiment in which a brachytherapy needle was inserted into a prostate phantom. Ultrasound radio-frequency data and the time-domain cross-correlation method, often used in ultrasound elastography, were used to generate the tissue displacement field during needle insertion. A three-parameter force density model was assumed for the needle-tissue interaction. With the needle displacement, tissue displacement and needle base forces as input data, finite element simulations were carried out to adjust the model parameters to achieve a good fit between simulated and measured data.
Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada. tims@ece.ubc.ca
Ehsan
E
Dehghan
Xu
X
Wen
Reza
R
Zahiri-Azar
Maud
M
Marchal
Septimiu E
SE
Salcudean
D001918:Brachytherapy / Q000295:instrumentation / Q000379:methods*; D003198:Computer Simulation; D003238:Connective Tissue / Q000000981:diagnostic imaging* / Q000502:physiology*; D006801:Humans; D008954:Models, Biological; D009339:Needles; D019919:Prosthesis Implantation / Q000379:methods*; D013314:Stress, Mechanical; D018084:Ultrasonography, Interventional / Q000379:methods*