1 June 2007 Conjugate cone-beam reconstruction algorithm
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Backprojection is an essential step of the cone-beam reconstruction algorithm for computed tomography. Conventional backprojection maps a reconstructed voxel to the projection space by interpolating across adjacent detector channels and rows of a single projection. Although this approach is computationally efficient, both theoretical analysis and phantom experiments have shown that a significant degradation in z resolution can result. To overcome this shortcoming, we propose a conjugate cone-beam backprojection approach in which two projections that are 180 deg apart are backprojected simultaneously. By carefully selecting the helical pitch and designing the interpolation function, the z resolution of the reconstructed images can be significantly improved. The proposed conjugate backprojection algorithm has the potential to reduce data extrapolation artifacts due to limited detector size in step-and-shoot data acquisition. Extensive computer simulations and phantom experiments are used to demonstrate the efficacy of our approach.
© (2007) Society of Photo-Optical Instrumentation Engineers (SPIE)
Jiang Hsieh, Jiang Hsieh, Xiangyang Tang, Xiangyang Tang, Jean-Baptiste Thibault, Jean-Baptiste Thibault, Charlie Shaughnessy, Charlie Shaughnessy, Roy A. Nilsen, Roy A. Nilsen, Eugene C. Williams, Eugene C. Williams, "Conjugate cone-beam reconstruction algorithm," Optical Engineering 46(6), 067001 (1 June 2007). https://doi.org/10.1117/1.2746866 . Submission:

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