Registration of free-hand ultrasound and MRI of carotid arteries through combination of point-based and intensity-based algorithms

Diego D.B. Carvalho, Stefan Klein, Zeynettin Akkus, Gerrit L. Ten Kate, Hui Tang, Mariana Selwaness, Arend F.L. Schinkel, Johan G. Bosch, Aad Van Der Lugt, Wiro J. Niessen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


We propose a methodology to register medical images of carotid arteries from tracked freehand sweep B-Mode ultrasound (US) and magnetic resonance imaging (MRI) acquisitions. Successful registration of US and MR images will allow a multimodal analysis of atherosclerotic plaque in the carotid artery. The main challenge is the difference in the positions of the patient's neck during the examinations. While in MRI the patient's neck remains in a natural position, in US the neck is slightly bent and rotated. Moreover, the image characteristics of US and MRI around the carotid artery are very different. Our technique uses the estimated centerlines of the common, internal and external carotid arteries in each modality as landmarks for registration. For US, we used an algorithm based on a rough lumen segmentation obtained by robust ellipse fitting to estimate the lumen centerline. In MRI, we extract the centerline using a minimum cost path approach in which the cost is defined by medialness and an intensity based similarity term. The two centerlines are aligned by an iterative closest point (ICP) algorithm, using rigid and thin-plate spline transformation models. The resulting point correspondences are used as a soft constraint in a subsequent intensity-based registration, optimizing a weighted sum of mutual information between the US and MRI and the Euclidean distance between corresponding points. Rigid and B-spline transformation models were used in this stage. Experiments were performed on datasets from five healthy volunteers. We compared different registration approaches, in order to evaluate the necessity of each step, and to establish the optimum algorithm configuration. For the validation, we used the Dice similarity index to measure the overlap between lumen segmentations in US and MRI.

Original languageEnglish (US)
Title of host publicationBiomedical Image Registration - 5th International Workshop, WBIR 2012, Proceedings
Number of pages10
StatePublished - 2012
Event5th International Workshop on Biomedical Image Registration, WBIR 2012 - Nashville, TN, United States
Duration: Jul 7 2012Jul 8 2012

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume7359 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference5th International Workshop on Biomedical Image Registration, WBIR 2012
Country/TerritoryUnited States
CityNashville, TN


  • Image registration
  • atherosclerosis
  • carotid artery
  • magnetic resonance imaging
  • ultrasound

ASJC Scopus subject areas

  • Theoretical Computer Science
  • General Computer Science


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