Lbp linear backprojection algorithm, also known as accumulation method, is the earliest simple imaging algorithm. It will accumulate all the projected rays at a certain point, and then estimate the density value of that point in reverse. From the imaging point of view, it is an incomplete inverse Leiden transform.
Calculation steps of lbp algorithm:
1. Based on homogeneous sensitivity information, the initial image is obtained by linear back projection algorithm.
2. Using the obtained dielectric constant distribution, the forward problem is solved, and a set of simulated capacitance values are obtained, and the values are compared with the measured capacitance values. If the error reaches a satisfactory value, the algorithm ends, otherwise, the next step is carried out.
3. Correct the sensitivity information.
4. According to the sensitivity information that has been corrected in the previous step, linear back projection is performed again by using the measured voltage; Return to the second step, and iterate circularly until satisfactory results are obtained, and the iteration is over.