The sinogram image is compressed.

Hi,

I have a question.

I performed rodon transform for a image and the sinogram is the middle form.

When I suppose the angular distance is 1, the sinogram is correct but as the angles become wider, sinogram's form compresses.

This image is a 1-180 sinogram with 4 degrees distances.

How can I solve the compressed form problem with wider angles?

Thank you.