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"Automated Extraction and Labelling of the Arterial Tree from Whole-Body MRA Data"

Rahil Shahzad, Oleh Dzyubachyk, Marius Staring, Joel Kullberg, Lars Johansson, Håkan Ahlström, Boudewijn P. F. Lelieveldt and Rob J. van der Geest

Abstract

In this work, we present a fully automated algorithm for extraction of the 3D arterial tree and labelling the tree segments from whole-body magnetic resonance angiography (WB-MRA) sequences. The algorithm developed consists of two core parts (i) 3D volume reconstruction from different stations with simultaneous correction of different types of intensity inhomogeneity, and (ii) Extraction of the arterial tree and subsequent labelling of the pruned extracted tree. Extraction of the arterial tree is performed using the probability map of the "contrast" class, which is obtained as one of the results of the inhomogeneity correction scheme. We demonstrate that such approach is more robust than using the difference between the pre- and post-contrast channels traditionally used for this purpose. Labelling the extracted tree is performed by using a combination of graph-based and atlas-based approaches. Validation of our method with respect to the extracted tree was performed on the arterial tree subdivided into 32 segments, 82.4% of which were completely detected, 11.7% partially detected, and 5.9% were missed on a cohort of 35 subjects. With respect to automated labelling accuracy of the 32 segments, various registration strategies were investigated on a training set consisting of 10 scans. Further analysis on the test set consisting of 25 data sets indicates that 69% of the vessel centerline tree in the head and neck region, 80% in the thorax and abdomen region, and 84% in the legs was accurately labelled to the correct vessel segment. These results indicate clinical potential of our approach in enabling fully automated and accurate analysis of the entire arterial tree. This is the first study that not only automatically extracts the WB-MRA arterial tree, but also labels the vessel tree segments.

 

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Copyright © 2015 by the authors. Published version © 2015 by Elsevier Science. Personal use of this material is permitted. However, permission to reprint or republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works, must be obtained from the copyright holder.

 

BibTeX entry

@article{Shahzad:2015,
author = "{Rahil Shahzad and Oleh Dzyubachyk and Marius Staring and Joel Kullberg and Lars Johansson and Håkan Ahlström and Boudewijn P. F. Lelieveldt and Rob J. van der Geest}",
title = "{Automated Extraction and Labelling of the Arterial Tree from Whole-Body MRA Data}",
journal = "{Medical Image Analysis}",
volume = "{24}",
number = "{1}",
pages = "{28 - 40}",
month = "{August}",
year = "{2015}",
}

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