When x-rays penetrate soft matter, their phase changes more rapidly than their amplitude. Interference effects
visible with high brightness sources creates higher contrast, edge enhanced images. When the object is piecewise
smooth (made of big blocks of a few components), such higher contrast datasets have a sparse solution. We
apply basis pursuit solvers to improve SNR, remove ring artifacts, reduce the number of views and radiation dose
from phase contrast datasets collected at the Hard X-Ray Micro Tomography Beamline at the Advanced Light
Source. We report a GPU code for the most computationally intensive task, the gridding and inverse gridding
algorithm (non uniform sampled Fourier transform).
This paper was published in SPIE Proceedings Vol. 7800