NDLI: High-order 3D FEM of prostate needle insertion forces

Content Provider	IEEE Xplore Digital Library
Author	Krishnan, A.P. O'Dell, W.G.
Copyright Year	2005
Description	Author affiliation: Dept. of Biomedical Eng., Rochester Univ., NY, USA (Krishnan, A.P.)
Abstract	The long term goal of this project is to predict the deformation brachytherapy needle insertion using a 3D finite element model (FEM). Our FEM was based on a realistic prostate geometry obtained from ultrasound images from a human patient subject, including the geometry of the urethra and prostate capsule. The model was used to investigate pin cushion deformation that occurs during brachytherapy just prior to puncture of the capsule. A 2D FEM was used previously to validate the approach. The 2D FEM employed non-linear element basis functions and the model predictions were compared to those reported in the literature. The current study employed a 3D FEM model with code developed in Matlab and using linear combinations of cubic Hermite finite element basis functions. The material properties for the prostate were those obtained from the literature. The base mesh was defined as an ellipsoidal prostate and capsule, with 48 nodes defining the prostate surface. The urethra was modelled as a paraboloid running through the prostate. The nodal parameters of the prostate base mesh were then optimized to match the unique anatomy of the representative human prostate under investigation. The surface fitting error after optimization was 1.4 mm. Finally, a 10 N axial force was applied to an apical capsule node and the deformed mesh satisfying force balance equilibrium was converged to in approximately 1 hour. A 8% reduction was found for the overall axial displacement of the node at which the force was applied when the results using the encapsulated prostate model was compared to previous results where the capsule was not included. This finding suggests that the capsule plays a prominent mechanical role in brachytherapy needle insertion and warrants a more in-depth study of capsule mechanical properties.
Starting Page	114
Ending Page	118
File Size	308114
Page Count	5
File Format	PDF
ISBN	0780392744
DOI	10.1109/ROMAN.2005.1513766
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-08-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Needles Mathematical model Brachytherapy Surface fitting Finite element methods Deformable models Predictive models Geometry Humans Ultrasonic imaging
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in