Enhancement of mobile C-arm cone-beam reconstruction using prior anatomical models

Ofri Sadowsky; Junghoon Lee; Edward Grant Sutter; Simon J Wall; Jerry L. Prince; Russell H. Taylor

doi:10.1117/12.813405

13 March 2009 Enhancement of mobile C-arm cone-beam reconstruction using prior anatomical models

Ofri Sadowsky, Junghoon Lee, Edward Grant Sutter, Simon J Wall, Jerry L. Prince, Russell H. Taylor

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72585B (2009) https://doi.org/10.1117/12.813405
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

We demonstrate an improvement to cone-beam tomographic imaging by using a prior anatomical model. A protocol for scanning and reconstruction has been designed and implemented for a conventional mobile C-arm: a 9 inch image-intensifier OEC-9600. Due to the narrow field of view (FOV), the reconstructed image contains strong truncation artifacts. We propose to improve the reconstructed images by fusing the observed x-ray data with computed projections of a prior 3D anatomical model, derived from a subject-specific CT or from a statistical database (atlas), and co-registered (3D/2D) to the x-rays. The prior model contains a description of geometry and radiodensity as a tetrahedral mesh shape and density polynomials, respectively. A CT-based model can be created by segmentation, meshing and polynomial fitting of the object's CT study. The statistical atlas is created through principal component analysis (PCA) of a collection of mesh instances deformably-registered (3D/3D) to patient datasets. The 3D/2D registration method optimizes a pixel-based similarity score (mutual information) between the observed x-rays and the prior. The transformation involves translation, rotation and shape deformation based on the atlas. After registration, the image intensities of observed and prior projections are matched and adjusted, and the two information sources are blended as inputs to a reconstruction algorithm. We demonstrate recostruction results of three cadaveric specimens, and the effect of fusing prior data to compensate for truncation. Further uses of hybrid reconstruction, such as compensation for the scan's limited arc length, are suggested for future research.

Citation Download Citation

Ofri Sadowsky, Junghoon Lee, Edward Grant Sutter, Simon J Wall, Jerry L. Prince, and Russell H. Taylor "Enhancement of mobile C-arm cone-beam reconstruction using prior anatomical models", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72585B (13 March 2009); https://doi.org/10.1117/12.813405

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