Neuroradiology

, Volume 56, Issue 5, pp 363–374 | Cite as

A subtraction pipeline for automatic detection of new appearing multiple sclerosis lesions in longitudinal studies

  • Onur Ganiler
  • Arnau Oliver
  • Yago Diez
  • Jordi Freixenet
  • Joan C. Vilanova
  • Brigitte Beltran
  • Lluís Ramió-Torrentà
  • Àlex Rovira
  • Xavier Lladó
Diagnostic Neuroradiology

Abstract

Introduction

Time-series analysis of magnetic resonance images (MRI) is of great value for multiple sclerosis (MS) diagnosis and follow-up. In this paper, we present an unsupervised subtraction approach which incorporates multisequence information to deal with the detection of new MS lesions in longitudinal studies.

Methods

The proposed pipeline for detecting new lesions consists of the following steps: skull stripping, bias field correction, histogram matching, registration, white matter masking, image subtraction, automated thresholding, and postprocessing. We also combine the results of PD-w and T2-w images to reduce false positive detections.

Results

Experimental tests are performed in 20 MS patients with two temporal studies separated 12 (12M) or 48 (48M) months in time. The pipeline achieves very good performance obtaining an overall sensitivity of 0.83 and 0.77 with a false discovery rate (FDR) of 0.14 and 0.18 for the 12M and 48M datasets, respectively. The most difficult situation for the pipeline is the detection of very small lesions where the obtained sensitivity is lower and the FDR higher.

Conclusion

Our fully automated approach is robust and accurate, allowing detection of new appearing MS lesions. We believe that the pipeline can be applied to large collections of images and also be easily adapted to monitor other brain pathologies.

Keywords

Multiple sclerosis Brain MRI longitudinal analysis Lesion change detection 3D subtraction 

Notes

Conflict of interest

We declare that we have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Onur Ganiler
    • 1
  • Arnau Oliver
    • 1
  • Yago Diez
    • 1
  • Jordi Freixenet
    • 1
  • Joan C. Vilanova
    • 2
  • Brigitte Beltran
    • 3
  • Lluís Ramió-Torrentà
    • 4
  • Àlex Rovira
    • 5
  • Xavier Lladó
    • 1
  1. 1.VICOROB Computer Vision and Robotics GroupUniversity of GironaGironaSpain
  2. 2.Girona Magnetic Resonance CenterGironaSpain
  3. 3.Institut d’Investigació Biomèdica de GironaDr. Josep Trueta University HospitalGironaSpain
  4. 4.Multiple Sclerosis and Neuroimmunology UnitDr. Josep Trueta University Hospital, Institut d’Investigació Biomèdica de GironaGironaSpain
  5. 5.Magnetic Resonance Unit, Department of RadiologyVall d’Hebron University HospitalBarcelonaSpain

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