Why do I get iradon error saying THETA does not match the number of projections?

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Tevin
Tevin 2024-4-3
评论： Tevin 2024-4-9
I want to do filter back projection after creating a sinogram, but I keep getting this error: The sinogram is made of 400 projections and has a size of 400 x 500.
Error using iradon>parse_inputs
THETA does not match the number of projections.
Error in iradon (line 119)
[p,theta,filter,d,interp,N] = parse_inputs(args{:});
reconstructed_image = iradon(sinogram, theta)
%This is the part of my code that does not work.
% Display the sinogram
figure;
imshow(sinogram, []);
% Define the angular range (theta) for equally spaced angles from 0 to 180 degrees with a step size of 0.45
theta = 0:0.45:180-0.45;
% Perform filtered back projection (FBP) using iradon to reconstruct the image
reconstructed_image = iradon(sinogram, theta;
% Display the reconstructed image
figure;
imshow(reconstructed_image, []);

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采纳的回答

R
R 2024-4-3
Hi Tevin,
I understand that the projection data i.e. 'sinogram' is made up of 400x500 projections. Therefore, 'theta' value should be a 1x500 numeric vector. The following code demonstrates the changes you can make to resolve the error:
theta = 0:180/500:180-180/500;
You can also use the following command that automatically sets the incremental angle between projections to 180/size(R,2)
reconstructed_image = iradon(sinogram, []);
Refer to the following documentation for more information:
https://www.mathworks.com/help/images/ref/iradon.html#d126e218710:~:text=theta%20%E2%80%94%20Projection%20angles
Hope this helps!

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