Methodology for registration of distended recutms in pelvic CT studies

Rodríguez Vila, Borja and García Vicente, Feliciano and Gómez Aguilera, Enrique J. (2012). Methodology for registration of distended recutms in pelvic CT studies. "Medical Physics", v. 39 (n. 10); pp. 6351-6359. ISSN 978-953-307-518-1. https://doi.org/10.1118/1.4754798.

Description

Title: Methodology for registration of distended recutms in pelvic CT studies
Author/s:
  • Rodríguez Vila, Borja
  • García Vicente, Feliciano
  • Gómez Aguilera, Enrique J.
Item Type: Article
Título de Revista/Publicación: Medical Physics
Date: October 2012
ISSN: 978-953-307-518-1
Volume: 39
Subjects:
Freetext Keywords: non-rigid registration, distended rectum, pelvic CT
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Tecnología Fotónica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Purpose: Accurate delineation of the rectum is of high importance in off-line adaptive radiation therapy since it is a major dose-limiting organ in prostate cancer radiotherapy. The intensity-based deformable image registration (DIR) methods cannot create a correct spatial transformation if there is no correspondence between the template and the target images. The variation of rectal filling, gas, or feces, creates a noncorrespondence in image intensities that becomes a great obstacle for intensity-based DIR. Methods: In this study the authors have designed and implemented a semiautomatic method to create a rectum mask in pelvic computed tomography (CT) images. The method, that includes a DIR based on the demons algorithm, has been tested in 13 prostate cancer cases, each comprising of two CT scans, for a total of 26 CT scans. Results: The use of the manual segmentation in the planning image and the proposed rectum mask method (RMM) method in the daily image leads to an improvement in the DIR performance in pelvic CT images, obtaining a mean value of overlap volume index = 0.89, close to the values obtained using the manual segmentations in both images. Conclusions: The application of the RMM method in the daily image and the manual segmentations in the planning image during prostate cancer treatments increases the performance of the registration in presence of rectal fillings, obtaining very good agreement with a physician's manual contours.

More information

Item ID: 16272
DC Identifier: http://oa.upm.es/16272/
OAI Identifier: oai:oa.upm.es:16272
DOI: 10.1118/1.4754798
Official URL: http://online.medphys.org/resource/1/mphya6/v39/i10/p6351_s1?isAuthorized=no
Deposited by: Memoria Investigacion
Deposited on: 10 Jul 2013 16:18
Last Modified: 21 Apr 2016 16:34
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