Cone beam image recontruction????

I have 360 Conebeam Projections ( PNG Images) taken with cone beam geometry (i.e. micro-focus X ray sources) and from these 360 2D-images i must reconstruct with Feldkamp Methode a volume. How can i calculate from the stored conebeam projections a 3D reconstruction

Can you help me please

Answer 1

[Amish]

Hi Izwaf,

To reconstruct a 3D volume from your 360 Conebeam Projections using the Feldkamp-Davis-Kress (FDK) method in MATLAB, you can follow these steps:

1. Load the Projections: Read your 360 PNG images into MATLAB.
2. Set Up Parameters: Define the geometry of your cone beam setup, including the source-to-detector distance, detector pixel size, and the number of projections.
3. Filter the Projections: Apply a ramp filter to each projection.
4. Backproject the Filtered Projections: Use the filtered backprojection algorithm to reconstruct the 3D volume.

You can find various examples showing the 3D Cone beam CT (CBCT) projection backprojection FDK and iterative reconstruction using MATLAB at the following File Exchange: https://www.mathworks.com/matlabcentral/fileexchange/35548-3d-cone-beam-ct-cbct-projection-backprojection-fdk-iterative-reconstruction-matlab-examples

You can also look at the ASTRA Toolbox Tutorials about Reconstruction from Projection Images.

Hope this helps.