How could i change the error of ram lak filter?

Hello;

I have a problem to make a ramlak filter.Infact i wrote down filter but there is a problem in reconstruct coz of filter. But i cant see the problem in my filter. I will appreciate if someone could help me.

% make a Ram-Lak filter. 
N_theta = length(0:179);

N1 = length(sinogram);

freqs=linspace(1,0,N1/2+1);

freqs2=linspace(0.0055,1,N1/2);

a=[freqs freqs2];

myFilter = repmat(a', [1 N_theta]);