Diffraction-enhanced X-ray medical imaging at the ELETTRA synchrotron light source

摘要

Conventional X-ray medical imaging makes use of the transmission properties of the sample. On the other hand, recently introduced phase-sensitive techniques take advantage of the phase shifts that occur when an electromagnetic wave encounters different refraction indices. Diffraction-Enhanced Imaging (DEI) is a phase-sensitive X-ray imaging technique based on the use of an analyzer placed between the sample and the detector. DEI performed at several synchrotron radiation facilities worldwide has proven outstanding image quality both in material science and medical imaging. At the medical imaging beamline SYRMEP under operation at the synchrotron radiation facility ELETTRA (Trieste, Italy), an analyzer system has been implemented to perform DEI. Experiments to evaluate the associated improvements in image quality were carried out on phantoms and biological samples and to prove that DEI is an appropriate tool for studying refraction and scattering properties. The results observed on the examples reported in this work suggest that the edge-enhancement effects and the superior sensitivity to soft tissue make DEI a valuable tool for early diagnosis of subtle diseases in many different fields.