Help needed in removing the shifts in the reconstructed slices (##HELP WANTED)

[aravinth-ray]

Hi I tried reconstruction using the FBP algorithm. The objects in the reconstructed images were observed to be shifted in a vertical direction. The images were taken with a static detector. From 0th slice to nth slice, the fibers in the images were moving from downward to upward direction. The machine parameters were listed below,

##Breast voxels density parameter.nx = 2304; % number of voxels (columns) parameter.ny = 2945; % number of voxels (rows) parameter.nz = 55; % number of voxels (slices)

Detector panel pixel density

parameter.nu = 2304; % number of pixels (columns) parameter.nv = 2945; % number of pixels (rows)

##Single voxel real size (mm) parameter.dx = 0.099; parameter.dy = 0.099; parameter.dz = 1;

Single detector real size (mm);

parameter.du = 0.099; parameter.dv = 0.099;

##X-ray source and detector distances parameter.DSD = 650; % Distance from source to detector (mm) parameter.DSO = 608; % Distance from source to the top of object (mm) parameter.DDR = 10; % Distance from detector to pivot (mm) parameter.DSR = parameter.DSD - parameter.DDR; % Distance from source to pivot (mm) parameter.DAG = 1; % Distance of Air Gap (mm)

Bit number quatization

parameter.bitDepth = 16; % Load from dicom header

Angle settings (Degrees)

parameter.tubeAngle = 11; % Tube Angle parameter.tubeDeg = linspace(-parameter.tubeAngle/2,parameter.tubeAngle/2,parameter.nProj);

I have tried flipping the parameter.tubeDeg angle from positive to negative[8 6 4 2 0 -2 -4 -6 -8]. But this method is also not working. All these information would be helpful for if you can provide me some ideas for resolving this issue.