How does Iradon and radon work?

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!

Answer 1

[Rik]

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

For future reference: Have a read here and here. It will greatly improve your chances of getting an answer. (for example, most tags you provided are either non-applicable (matlab coder) or too general (help))