int m_nPElem; // number of pelems in phantom
double m_xmin, m_xmax, m_ymin, m_ymax; // extent of pelems in pelem coordinates
double m_diameter; // diameter of object
int m_nPElem; // number of pelems in phantom
double m_xmin, m_xmax, m_ymin, m_ymax; // extent of pelems in pelem coordinates
double m_diameter; // diameter of object