Figure 1
From: Grating-based phase-contrast and dark-field computed tomography: a single-shot method
Comparison of different reconstruction methods for several acquisition patterns. The rows from top to bottom show reconstructions of a phantom’s attenuation, refractive index decrement and linear diffusion coefficient. (PS-SIR) shows reconstructions of a phase-stepping scan composed of 101 angular positions with 3 phase-steps each. (PS-IBSIR) shows reconstructions of the same scan using a direct interferogram-based reconstruction algorithm. Both reconstructions show distinct artifacts, marked by the arrows, caused by angular undersampling. (SW-IBSIR) uses the IBSIR algorithm to reconstruct a sliding window acquisition pattern composed of 303 angular positions using only a single, but changing, grating position. (SSEPS-IBSIR) is the reconstruction of a single-shot electromagnetic phase-stepping acquisition pattern using a single fixed grating position for 303 angular positions. Both methods strongly reduce the undersampling artifacts. Below the images line plots along the yellow box for all channels are given.
