X-ray phase contrast tomography by tracking near field speckle.

摘要: X-ray imaging techniques that capture variations in the x-ray phase can yield higher contrast images with lower dose than is possible conventional absorption radiography. However, extraction of information often more difficult and requires a sophisticated experimental arrangement. We here report method for three-dimensional (3D) computed tomography (CT) which gives quantitative volumetric on real part refractive index. The based recently developed speckle tracking technique displacement near field tracked using digital image correlation algorithm. In addition to differential projection images, allows dark-field be simultaneously extracted. After reconstruction, compared CT 3D show greatly enhanced contrast. This new has advantages other methods simplicity arrangement, speed measurement relative insensitivity beam movements. These features make an attractive candidate material such as in-vivo biological systems containing soft tissue.