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Localized-atlas-based segmentation of breast MRI in a decision-making framework.

Aida Fooladivanda1, Shahriar B Shokouhi2, Nasrin Ahmadinejad3

  • 1Department of Electrical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran. a_fooladivanda@iust.ac.ir.

Australasian Physical & Engineering Sciences in Medicine
|January 25, 2017
PubMed
Summary

Accurate breast segmentation in MRI is crucial for diagnosis. This study introduces a robust method using a decision framework and localized atlases, achieving high accuracy for complex and simple cases.

Keywords:
Atlas-based segmentationBreast MRIBreast segmentationGeometric featuresLocalized-atlasSupport vector machine (SVM)

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Area of Science:

  • Medical Imaging
  • Radiology
  • Computer-Aided Diagnosis

Background:

  • Breast-region segmentation in MRI is vital for density estimation and CAD systems.
  • Accurate segmentation is challenging due to the similarity between fibroglandular tissue and pectoral muscle, particularly at the breast-chest wall boundary.
  • Existing methods struggle with complex cases where these tissues are connected.

Purpose of the Study:

  • To propose a robust breast-region segmentation method for Magnetic Resonance Imaging (MRI).
  • To develop a decision-making framework capable of handling both simple and complex breast segmentation cases.
  • To improve the accuracy and efficiency of breast segmentation for Computer-Aided Diagnosis (CAD) systems.

Main Methods:

  • A decision-making framework utilizing geometric features and Support Vector Machine (SVM) to classify cases as simple or complex.
  • For complex cases, a hybrid approach combining intensity-based and a novel localized-atlas based segmentation is employed.
  • Simple cases are segmented using an intensity-based approach, while the localized-atlas method uses a chest wall template for atlas construction and registration within the region of interest (ROI).

Main Results:

  • The proposed method achieved high segmentation accuracy with a Dice similarity coefficient of 96.3% and Jaccard coefficient of 92.9%.
  • Excellent overlap (97.4%) with low false positive (4.77%) and false negative (2.61%) rates were reported.
  • The average deviation distance for breast-chest wall boundary localization was 1.97 mm, indicating precise boundary detection.

Conclusions:

  • The developed framework provides robust and accurate breast-region segmentation across diverse breast sizes, shapes, and densities.
  • The method demonstrates negligible errors and efficient computational time, making it suitable for clinical applications in MRI.
  • This approach effectively addresses the challenges of segmenting complex breast-chest wall boundaries, enhancing CAD system reliability.