Trying to run the code for tiff file and different geometries

[ghan7213]

Dear Rodrigo;

I am trying to run it for a prototype system where the input data is in tiff files. Also the geometry is also different. My geometry is 9 angular projections over 15 degree angular span. Here is the attached pdf file for the schematics.
details.pdf
What changes we need to make for the tiff file and different geometry.

[ghan7213]

Here is the projection imaging data. They can be opened in imageJ.They are 32 bit.

https://drive.google.com/drive/folders/1b_ZiXx1kg3vYDmfusHEZoL3TYfSMDiIm?usp=sharing

[rodrigovimieiro]

Hello @ghan7213,

Have you tried CT toolboxes? This geometry seems to be more like CT than breast tomosynthesis.

In DBT, the detector does not rotate with the tube. It is static or slightly moves. Your object is moving in the horizontal, and DBT, the breast moves in the vertical direction. Also, seems that the tube in your geometry is at the image center, am I correct?

I would recommend Tigre if you decide to use CT toolboxes.

Please, let me know what you think.

Best.

[ghan7213]

I don't think the angle of detector matters. It's the angular view from where the xray source is seeing the sample. Siemens DBT acquires projections where both detector and source moves with same angles. I can see in your code about the angle of detector. I wonder if it's changed to see if it works.

[rodrigovimieiro]

Do you know where the tube is exactly?

[ghan7213]

In this case, the tube and detector move in opposite directions as expected. The angles that are given in the file are of the tube angle of rotation. The tube to sample distance is 66.58 cm.

[rodrigovimieiro]

At the center projection, e.g. 0 degrees, where is the projection of the tube in the detector in terms of row and column indices? In DBT, e.g., we normally place the origin at this position (nRow // 2, nCol). Different from CT, the tube is not at the center of the detector. Let me know if I was clear.