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Regional infarction identification from cardiac CT images: a computer-aided biomechanical approach.

Abstract：

PURPOSE:Regional infarction identification is important for heart disease diagnosis and management, and myocardial deformation has been shown to be effective for this purpose. Although tagged and strain-encoded MR images can provide such measurements, they are uncommon in clinical routine. On the contrary, cardiac CT images are more available with lower costs, but they only provide motion of cardiac boundaries and additional constraints are required to obtain the myocardial strains. The goal of this study is to verify the potential of contrast-enhanced CT images on computer-aided regional infarction identification. METHODS:We propose a biomechanical approach combined with machine learning algorithms. A hyperelastic biomechanical model is used with deformable image registration to estimate 3D myocardial strains from CT images. The regional strains and CT image intensities are input to a classifier for regional infarction identification. Cross-validations on ten canine image sequences with artificially induced infarctions were used to study the performances of using different feature combinations and machine learning algorithms. RESULTS:Radial strain, circumferential strain, first principal strain, and image intensity were shown to be discriminative features. The highest identification accuracy ([Formula: see text] %) was achieved when combining radial strain with image intensity. Random forests gave better results than support vector machines on less discriminative features. Random forests also performed better when all strains were used together. CONCLUSION:Although CT images cannot directly measure myocardial deformation, with the use of a biomechanical model, the estimated strains can provide promising identification results especially when combined with CT image intensity.

journal_name

Int J Comput Assist Radiol Surg

journal_title

International journal of computer assisted radiology and surgery

authors

Wong KC,Tee M,Chen M,Bluemke DA,Summers RM,Yao J

doi

10.1007/s11548-016-1404-5

subject

Has Abstract

pub_date

2016-09-01 00:00:00

pages

1573-83

issue

eissn

1861-6410

issn

1861-6429

pii

10.1007/s11548-016-1404-5

journal_volume

pub_type

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Regional infarction identification from cardiac CT images: a computer-aided biomechanical approach.