勃起功能障碍,4个月了,检查过性激素正常,血糖5.3正常,阴茎血流桡动脉PSV19.06cm/s,edv0.15cm/s,mv3.12cm/s,hr68.57,ri0.99,pi5.89,背动脉PSV11.87cm/s,EDV0.15cm/s,MV5.11cm/s,HR0,RI0.98,PI2.29,左海绵体PSV13.43cm/s,EDV0cm/sMV0.89cm/s,HR0,RI1,PI15.08,右海绵体PSV3.67cm/s,EDV0cm/sMV0.86cm/s,HR0,RI1,PI4.26PFI3.5是否正常,怎样治疗