How does Iradon and radon work?

Question

hasan alhussaini 2017-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/356540-how-does-iradon-and-radon-work

回答： Rik 2017-9-13

sinogram.mat

Hi I'm a beginner, I've got a sinogram attach, and i'm not sure what i'm doing wrong with the following code, the data projections have been collected over 180 degrees. 1 degree per projection;

      theta=0:1:179;
      [R,xp]= radon(sinog_2,theta);
      Dtheta=1;
filt=input( 'Filter?\n 1 = Gen-Hamming; 2 = Shepp-Logan; 3 = Ramp; 4 = none ');
    switch( filt)
        case  1
           m_out=iradon(R,Dtheta,'Hamming');
        case 2
          m_out=iradon(R,Dtheta,'Shepp-Logan');
        case 3
           m_out=iradon(R,Dtheta,'Ram-Lak');
        case 4
           m_out=iradon(R,Dtheta,'none');

i feel like it is incomplete...

any help would be amazing Thanks!

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Answer 1

Rik 2017-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/356540-how-does-iradon-and-radon-work#answer_281420

Dtheta shouldn't be just one angle. The theta you use in the radon function is the same you should use in iradon.

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