TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Wieder, Frank A1 - Bellon, Carsten A1 - Ewert, Uwe A1 - Vogel, Justus A1 - Sanjeevareddy, Sanjeevareddy A1 - Zscherpel, Uwe T1 - Back scatter X-ray imaging with twisted slit collimator – quantitative simulation and comparison to experiments N2 - X-ray backscatter imaging is a promising NDT technique to inspect complex objects using only a single-sided access. In difference to conventional transmission X-ray radiography, the X-ray backscatter imaging utilizes the scattered radiation caused by the Compton scattering effect. In order to achieve high backscatter intensities from a test object, it is necessary to optimize the backscatter system parameters namely the angle between source and slit camera, the slit-collimator system, the shielding between the source and scatter camera, and the type of detector. Here a single-slit as well as a multi-slit camera are considered. For the multi-slit camera several twisted slits were parallel arranged in a metal block. This camera generates a set of similar projections per slit overlaying each other. Afterwards, the image is corrected based on a de-convolution algorithm to focus the overlaying projections into a single representation of the object. The scatter phenomena in the object under inspection are investigated. In this contribution, the Monte Carlo model McRay is discussed, which considers all relevant single and multiple interactions of photons and electrons. This model can be used to simulate back scatter techniques. Simulations are important to describe the imaging process, to interpret the results, and to optimize the backscatter camera investigated here. Experimental results will be presented and compared with simulations. T2 - 55th Annual British Conference of Non-Destructive Testing CY - Nottingham, UK DA - 12.09.2016 KW - Modeling KW - X-rays KW - Backscatter application KW - Synthetic aperture focusing PY - 2016 AN - OPUS4-37618 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -