We seek to characterize the sampling conditions for iterative image reconstruction exploiting gradient-magnitude sparsity. We seek the number of views necessary for accurate image reconstruction by constrained, total variation (TV) minimization, which is the optimization problem suggested in the compressive sensing (CS) community for this type of sparsity. The preliminary finding here, based on simulations using images of realistic sparsity levels, is that necessary sampling can go as low as N/4 views for an NxN pixel array. This work sets the stage for fixed-exposure studies where the number of projections is balanced against the X-ray intensity per projection.
|Journal||Proceedings of SPIE, the International Society for Optical Engineering|
|Publication status||Published - 2012|
|Event||SPIE Medical Imaging 2012: Ultrasonic Imaging, Tomography, and Therapy - San Diego, United States|
Duration: 4 Feb 2012 → 9 Feb 2012
|Conference||SPIE Medical Imaging 2012|
|Period||04/02/2012 → 09/02/2012|
|Other||Proc. volume 8320|