Evaluation of PET reconstruction with sinogram restoration and detector motion

In a recent paper, a resolution-enhancement approach for tomographic imaging was proposed (see J. Opt. Soc. Am. A, vol. 9, p. 1547-53, 1992). The authors suggested that improved image quality can be achieved by undersampled tomographic systems if scanning motions are introduced, and signal restoration is applied in the preparation of the sinogram prior to reconstruction. Here, the authors summarize the results of studies designed to evaluate the performance of the method for quantitative imaging tasks. They use wobble motion to improve restoration performance by finely sampling the signal. The method of projections onto convex sets (POCS) is used to compute the sinogram, from which the image is reconstructed by conventional filtered backprojection. The advantage of this approach is that significant improvements in image quality are obtained without the computational burden associated with iterative image-space reconstruction methods