A reconstruction method for cone-beam differential x-ray phase-contrast computed tomography

作者：Fu Jian^*; Velroyen Astrid; Tan Renbo; Zhang Junwei; Chen Liyuan; Tapfer Arne; Bech Martin; Pfeiffer Franz

来源：Optics Express, 2012, 20(19): 21512-21519.

DOI：10.1364/OE.20.021512

Most existing differential phase-contrast computed tomography (DPC-CT) approaches are based on three kinds of scanning geometries, described by parallel-beam, fan-beam and cone-beam. Due to the potential of compact imaging systems with magnified spatial resolution, cone-beam DPC-CT has attracted significant interest. In this paper, we report a reconstruction method based on a back-projection filtration (BPF) algorithm for cone-beam DPC-CT. Due to the differential nature of phase contrast projections, the algorithm restrains from differentiation of the projection data prior to back-projection, unlike BPF algorithms commonly used for absorption-based CT data. This work comprises a numerical study of the algorithm and its experimental verification using a dataset measured with a three-grating interferometer and a micro-focus x-ray tube source. Moreover, the numerical simulation and experimental results demonstrate that the proposed method can deal with several classes of truncated cone-beam datasets. We believe that this feature is of particular interest for future medical cone-beam phase-contrast CT imaging applications.

• 出版日期2012-9-10
• 单位北京大学