Spectral imaging at BM-18 with single shot acquisition using prisms

The overall objective is to develop a new method for 2D and 3D spectral computed tomography on synchrotron beamlines. Spectral or energy-resolved transmission imaging on beamlines is realized for example by collimating pencil synchrotron micro-beams. Generally, the energy resolution stems from crystal- or multi-layer mirrors positioned upstream of the object. Since every energy and pixel have to be scanned by consecutive motor steps these scans are extremely time consuming and their applicability to larger objects, i.e., higher energies like those on BM18 remains largely theoretical. With this project we propose to use pre-filtered high-energy polychromatic beams for single shot acquisition of spectral pixel lines. Our setup places refractive optics downstream of the object for mapping the polychromatic X-rays line wise onto spectral projections for the slice beam geometry of BM18 as well as algorithms and software for the visualization of the spectral data.