Abstract
Purpose
Temporal subtraction images constructed from image registration can facilitate the visualization of pathologic changes. In this study, we propose a deformable image registration (DIR) framework for creating temporal subtraction images of chest radiographs.
Methods
We developed a DIR methodology using two different image similarity metrics, varying flow (VF) and compressible flow (CF). The proposed registration method consists of block matching, filtering, and interpolation. Specifically, corresponding point pairs between reference and target images are initially determined by minimizing a nonlinear least squares formulation using grid-searching optimization. A two-step filtering process, including least median of squares filtering and backward matching filtering, is then applied to the estimated point matches in order to remove erroneous matches. Finally, moving least squares is used to generate a full displacement field from the filtered point pairs.
Results
We applied the proposed DIR method to 10 pairs of clinical chest radiographs and compared it with the demons and B-spline algorithms using the five-point rating score method. The average quality scores were 2.7 and 3 for the demons and B-spline methods, but 3.5 and 4.1 for the VF and CF methods. In addition, subtraction images improved the visual perception of abnormalities in the lungs by using the proposed method.
Conclusion
The VF and CF models achieved a higher accuracy than the demons and the B-spline methods. Furthermore, the proposed methodology demonstrated the ability to create clinically acceptable temporal subtraction chest radiographs that enhance interval changes and can be used to detect abnormalities such as non-small cell lung cancer.







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Acknowledgments
We thank Dr. Samantha Aso and Justin Yu in the Department of Radiation Oncology at the University of Texas MD Anderson Cancer Center, for providing help in subtraction image observation. This work is partially funded by MD Anderson’s Cancer Center Support Grant (CA016672) and the National Institutes of Health through an NIH Director’s New Innovator Award (DP2OD007044), and by the grants from the National Natural Science Foundation of China (NSFC No. 60771025).
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The authors declare that they have no conflict of interest.
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Li, M., Castillo, E., Luo, HY. et al. Deformable image registration for temporal subtraction of chest radiographs. Int J CARS 9, 513–522 (2014). https://doi.org/10.1007/s11548-013-0947-y
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DOI: https://doi.org/10.1007/s11548-013-0947-y