Digital Tomographic Image Reconstruction System Using a X-ray Cinematogram

Tomographic Image Reconstruction using Dictionary Priors

We describe and examine an algorithm for tomographic image reconstruction where prior knowledge about the solution is available in the form of training images. We first construct a nonnegative dictionary based on prototype elements from the training images; this problem is formulated as a regularized non-negative matrix factorization. Incorporating the dictionary as a prior in a convex reconstr...

Non-convexly constrained image reconstruction from nonlinear tomographic X-ray measurements.

The use of polychromatic X-ray sources in tomographic X-ray measurements leads to nonlinear X-ray transmission effects. As these nonlinearities are not normally taken into account in tomographic reconstruction, artefacts occur, which can be particularly severe when imaging objects with multiple materials of widely varying X-ray attenuation properties. In these settings, reconstruction algorithm...

Tomographic Image Reconstruction

Image Distortion Compensation by Using a Polynomial Model in an X-ray Digital Tomosynthesis System

X-ray technology has been widely used in a number of industrial applications for monitoring and inspecting inner defects which can hardly be found by normal vision systems as a ball grid array (BGA) or a flip chip array (FCA). Digital tomosynthesis (DT) is one of the most useful X-ray cross-sectional imaging methods for PCB inspection, and it usually uses an X-ray image intensifier. However, th...

Evaluating fracture healing using digital x-ray image analysis

Sarah Whiley holds a bachelor’s degree in Electrical Engineering from the University of Cape Town. After completing her MSc in Biomedical Engineering at the same institution, studying anterior-cruciate ligament repair, she spent three years completing a doctorate in the Department of Orthopaedic Engineering at the University of Edinburgh, developing techniques for assessing fracture healing usi...