Holographic X Ray Detection

Download or read book Holographic X-ray Detection written by George Kiyoshi Herring and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to non-destructively image the interior of an object with X-rays has enabled huge advances in science and medicine. X-ray differential phase contrast (DPC) is the next generation in imaging, providing higher contrast for soft materials. However, X-ray DPC suffers from poor X-ray detector resolution. Typical commercial detectors have a fundamental physical tradeoff between image resolution and radiation dose. In this dissertation, I present a new method for X-ray detection that overcomes this fundamental limit. This new method uses photo refractive materials from the field of holography to create a high resolution detector which can, in conjunction with X-ray DPC techniques, measure the absorption and refraction of X-rays as they pass through objects. This new detector operates in three main stages: first, interfering X-rays record a hologram into a photorefractive crystal. Then, this crystal is illuminated with visible light to 'read-out' and digitally record the image. Finally, the crystal is erased with ultraviolet light after the image is collected. The result is an X-ray detector with an order of magnitude improvement in resolution (to 208 lp/mm), an order of magnitude improvement in quantum efficiency (to 80%), and a drastic reduction in production cost.