Scalable High-Performance Image Registration Framework by Unsupervised Deep Feature Representations Learning - PubMed (original) (raw)

Scalable High-Performance Image Registration Framework by Unsupervised Deep Feature Representations Learning

Guorong Wu et al. IEEE Trans Biomed Eng. 2016 Jul.

Erratum in

Abstract

Feature selection is a critical step in deformable image registration. In particular, selecting the most discriminative features that accurately and concisely describe complex morphological patterns in image patches improves correspondence detection, which in turn improves image registration accuracy. Furthermore, since more and more imaging modalities are being invented to better identify morphological changes in medical imaging data, the development of deformable image registration method that scales well to new image modalities or new image applications with little to no human intervention would have a significant impact on the medical image analysis community. To address these concerns, a learning-based image registration framework is proposed that uses deep learning to discover compact and highly discriminative features upon observed imaging data. Specifically, the proposed feature selection method uses a convolutional stacked autoencoder to identify intrinsic deep feature representations in image patches. Since deep learning is an unsupervised learning method, no ground truth label knowledge is required. This makes the proposed feature selection method more flexible to new imaging modalities since feature representations can be directly learned from the observed imaging data in a very short amount of time. Using the LONI and ADNI imaging datasets, image registration performance was compared to two existing state-of-the-art deformable image registration methods that use handcrafted features. To demonstrate the scalability of the proposed image registration framework, image registration experiments were conducted on 7.0-T brain MR images. In all experiments, the results showed that the new image registration framework consistently demonstrated more accurate registration results when compared to state of the art.

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Figures

Fig. 1

Fig. 1

The reconstructed image patches by single Auto-Encoder (b) and Stacked Auto-Encoder (e). The bright and dark colors indicate large and small reconstruction errors, respectively.

Fig. 2

Fig. 2

The hierarchical architecture of Stacked Auto-Encoder (SAE).

Fig. 3

Fig. 3

The 3×3 max pooling procedure in convolutional network.

Fig. 4

Fig. 4

The importance map and the sampled image patches (denoted by the red dots) for deep learning. The color bar indicates the varying importance values for individual voxels.

Fig. 5

Fig. 5

The similarity maps of identifying the correspondence for the red-crossed point in the template (a) w.r.t. the subject (b) by handcraft features (d–e) and the learned features by unsupervised deep learning (f). The registered subject image is shown in (c). It is clear that the in-accurate registration results might undermine the supervised feature representation learning that highly relies on the correspondences across all training images.

Fig. 6

Fig. 6

The Dice ratios of 56 ROIs on LONI dataset by 6 registration methods.

Fig. 7

Fig. 7

Large structural difference around hippocampus between 1.5-tesla (a) and 7.0-tesla (b) MR images. The 1.5-tesla image is enlarged w.r.t. the image resolution of the 7.0-tesla image for convenience of visual comparison. .

Fig. 8

Fig. 8

Typical registration results on 7.0-tesla MR brain images by Demons, HAMMER, and H+DP, respectively. Three rows represent three different slices in the template, subject, and registered subjects.

Fig. 9

Fig. 9

The Dice ratios of 56 ROIs in LONI dataset by HAMMER (blue), H+DP-LONI (red), and H+DP-ADNI (green), respectively. Note, H+DP-LONI denotes for the HAMMER registration integrating with the feature representations learned directly from LONI dataset, while H+DP-ADNI stands for applying HAMMER registration on LONI dataset but using the feature representations learned from ADNI dataset, respectively.

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