Fast and accurate X-ray fluorescence computed tomography imaging with the ordered-subsets expectation maximization algorithm

The ordered-subsets expectation maximization algorithm in X-ray fluorescence computed tomography allows image reconstruction with a large angular sampling interval but maintaining a high image quality.

QXAFS system of the BL14W1 XAFS beamline at the Shanghai Synchrotron Radiation Facility

A quick-scanning XAFS system, based on EPICS and LabVIEW, was developed at beamline BL14W1 at the Shanghai Synchrotron Radiation Facility. This paper described the whole system, including the equipment implemented on the beamline and the factors related to its performance. The signal-to-noise ratio was studied under different experimental situations.