You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: MRAMLA.m
    path of file: ./repos/OMEGA/source
    
    the code of the file until where you have to start completion: function x_mramla = MRAMLA(options)
%MRAMLA Modified Row-Action Maximum Likelihood Algorithm reconstruction.
%   Implements the MRAMLA reconstruction on input PET data.
%   See main_nongate.m for options-variables.
%

    
function x_mramla = MRAMLA(options)
%MRAMLA Modified Row-Action Maximum Likelihood Algorithm reconstruction.
%   Implements the MRAMLA reconstruction on input PET data.
%   See main_nongate.m for options-variables.
%
%   x_mramla = MRAMLA(options) returns the MRAMLA reconstructions for all
%   iterations, including the initial value.

if iscell(options.SinM)
    Sino = options.SinM{1};
    Sino = Sino(:);
else
    Sino = options.SinM;
    Sino = Sino(:);
end