Fig. 1. Schematic diagram of two-dimensional Radon transform

Fig. 2. Schematic diagram of iterative EF inverse projection reconstruction algorithm

Fig. 3. Schematic diagram of d and r changing with C

Fig. 4. Comparison of reconstructed images between EF inverse projection and iterative EF inverse projection algorithms.(a) EF inverse projection reconstructed image; (b) grey value comparison of the 128^th line for EF inverse projection algorithm; (c) iterative EF inverse projection reconstructed image; (d) corresponding grey value comparison of the 128^th line for iterative EF inverse projection algorithm

Fig. 5. Diagram of the refractive index field measurement system based on laser polarization tomography for algorithm verification

Fig. 6. Reconstruction results of 3D refraction field. (a) By EF inverse projection reconstruction algorithm; (b) by iterative EF inverse projection reconstruction algorithm

Fig. 7. Comparison of refractive index results got by two reconstruction algorithms and calibration results of the instrument

Table 1. Expressions of each filter function

Table 2. d and r of reconstruction results by different filter functions

Table 3. d and r of reconstruction results of EF inverse projection reconstruction algorithm and presented algorithm