Tomosynthesis imaging with 2D scanning trajectories

Kedar Khare; Bernhard E. H. Claus; Jeffrey W. Eberhard

doi:10.1117/12.878272

16 March 2011 Tomosynthesis imaging with 2D scanning trajectories

Kedar Khare, Bernhard E. H. Claus, Jeffrey W. Eberhard

Proceedings Volume 7961, Medical Imaging 2011: Physics of Medical Imaging; 796115 (2011) https://doi.org/10.1117/12.878272
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

Tomosynthesis imaging in chest radiography provides volumetric information with the potential for improved diagnostic value when compared to the standard AP or LAT projections. In this paper we explore the image quality benefits of 2D scanning trajectories when coupled with advanced image reconstruction approaches. It is intuitively clear that 2D trajectories provide projection data that is more complete in terms of Radon space filling, when compared with conventional tomosynthesis using a linearly scanned source. Incorporating this additional information for obtaining improved image quality is, however, not a straightforward problem. The typical tomosynthesis reconstruction algorithms are based on direct inversion methods e.g. Filtered Backprojection (FBP) or iterative algorithms that are variants of the Algebraic Reconstruction Technique (ART). The FBP approach is fast and provides high frequency details in the image but at the same time introduces streaking artifacts degrading the image quality. The iterative methods can reduce the image artifacts by using image priors but suffer from a slow convergence rate, thereby producing images lacking high frequency details. In this paper we propose using a fast converging optimal gradient iterative scheme that has advantages of both the FBP and iterative methods in that it produces images with high frequency details while reducing the image artifacts. We show that using favorable 2D scanning trajectories along with the proposed reconstruction method has the advantage of providing improved depth information for structures such as the spine and potentially producing images with more isotropic resolution.

Citation Download Citation

Kedar Khare, Bernhard E. H. Claus, and Jeffrey W. Eberhard "Tomosynthesis imaging with 2D scanning trajectories", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 796115 (16 March 2011); https://doi.org/10.1117/12.878272

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