void projectSingleView (const Phantom& phm, DetectorArray& darray, const double xd1, const double yd1, const double xd2, const double yd2, const double xs1, const double ys1, const double xs2, const double ys2);
double projectSingleLine (const Phantom& phm, const double x1, const double y1, const double x2, const double y2);
void projectSingleView (const Phantom& phm, DetectorArray& darray, const double xd1, const double yd1, const double xd2, const double yd2, const double xs1, const double ys1, const double xs2, const double ys2);
double projectSingleLine (const Phantom& phm, const double x1, const double y1, const double x2, const double y2);