string optFilterName = SignalFilter::FILTER_ABS_BANDLIMIT_STR;
string optFilterMethodName = SignalFilter::FILTER_METHOD_CONVOLUTION_STR;
string optInterpName = Backprojector::INTERP_LINEAR_STR;
string optFilterName = SignalFilter::FILTER_ABS_BANDLIMIT_STR;
string optFilterMethodName = SignalFilter::FILTER_METHOD_CONVOLUTION_STR;
string optInterpName = Backprojector::INTERP_LINEAR_STR;