CT Comparative Study Of The Reconstruction Algorithm

The article to the core of CT technology, form the projection reconstruction algorithm, which studied to search a best method of reconstructed image. As the goal for the image(detection of objects) to find excellent teaching designed reconstruction algorithm. The article used theories of Radon transform , Threshold de-noising and Center slice. Through comparative study can draw wavelet composite algorithm is better than the others. The algorithm is accurate ( small error), faster, and not sensitive to noises. When the projection data is not accurate, the algorithm can be quite satisfactory images.1. Studied some kind of CT image reconstruction algorithms, filtered back projection algorithm analysis of filter back-projection and fanshaped filter back-projection, the use of wavelet threshold decomposition, median filtering, average filtering analysis of the template capacity of the advantages of image reconstruction .Compare the CT image reconstruction algorithms and the effect of the reconstructed image through the algorithm, finally get an ideal reconstruction.2. Simulation Based on Wavelet Transform Filtering projection combination of fanshaped filter back-projection, filter back-projection algorithm, due to multi-resolution analysis of wavelet transform properties, through the Wavelet Multi-scale analysis and wavelet coefficients of control, combined with median filtering has the MSE (mean square) at optimal performance feature, presents a combination of both methods for noise reduction preprocessing projection data. The results showed that noise reduction of image reconstruction significantly improved the subjective quality of the reconstruction image noise to be effectively results.3. Simulation of the mean filter based on wavelet transform projection respectively with FDK, FBP combination of algorithm, a combination of both methods for noise reduction Preprocessing projection data. But the result is not entirely satisfactory4. Each kind of reconstruction algorithm carries on the quota the computation. Analyzed the reconstruction algorithm and each kind of noise CT chart adapted. Carry on the comparative analysis to obtain the result.