Please use this identifier to cite or link to this item:
Title: Evaluation of three-dimensional finite element-based deformable registration of pre- and intraoperative prostate imaging
Authors: Bharatha, Aditya
Hirose, Masanori
Hata, Nobuhiko
Warfield, Simon K.
Ferrant, Matthieu
Zou, Kelly H.
Suarez-Santana, Eduardo
Ruiz-Alzola, Juan 
D'Amico, Anthony
Cormack, Robert A.
Kikinis, Ron
Jolesz, Ferenc A.
Tempany, Clare M.C.
UNESCO Clasification: 3314 Tecnología médica
Keywords: Finite‐element and Galerkin methods
magnetic resonance imaging
Image analysis
medical image processing
Image registration
Issue Date: 2001
Publisher: 0094-2405
Journal: Medical Physics 
Abstract: In this report we evaluate an image registration technique that can improve the information content of intraoperative image data by deformable matching of preoperative images. In this study, pretreatment 1.5 tesla (T) magnetic resonance (MR) images of the prostate are registered with 0.5 T intraoperative images. The method involves rigid and nonrigid registration using biomechanical finite element modeling. Preoperative 1.5 T MR imaging is conducted with the patient supine, using an endorectal coil, while intraoperatively, the patient is in the lithotomy position with a rectal obturator in place. We have previously observed that these changes in patient position and rectal filling produce a shape change in the prostate. The registration of 1.5 T preoperative images depicting the prostate substructure [namely central gland (CG) and peripheral zone (PZ)] to 0.5 T intraoperative MR images using this method can facilitate the segmentation of the substructure of the gland for radiation treatment planning. After creating and validating a dataset of manually segmented glands from images obtained in ten sequential MR-guided brachytherapy cases, we conducted a set of experiments to assess our hypothesis that the proposed registration system can significantly improve the quality of matching of the total gland (TG), CG, and PZ. The results showed that the method statistically-significantly improves the quality of match (compared to rigid registration), raising the Dice similarity coefficient (DSC) from prematched coefficients of 0.81, 0.78, and 0.59 for TG, CG, and PZ, respectively, to 0.94, 0.86, and 0.76. A point-based measure of registration agreement was also improved by the deformable registration. CG and PZ volumes are not changed by the registration, indicating that the method maintains the biomechanical topology of the prostate. Although this strategy was tested for MRI-guided brachytherapy, the preliminary results from these experiments suggest that it may be applied to other settings such as transrectal ultrasound-guided therapy, where the integration of preoperative MRI may have a significant impact upon treatment planning and guidance.
ISSN: 0094-2405
DOI: 10.1118/1.1414009
Source: Medical Physics[ISSN 0094-2405],v. 28, p. 2551-2560
Appears in Collections:Artículos
Show full item record

Google ScholarTM




Export metadata

Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.