If a monocentric system existed for which an incident collimated beam emerged as exactly collimated, then the system would give geometrically perfectimaging of any point in space.
当入射光束与出射光束平行时，单色同心光学系统空间任一点成几何理想像。
2
Conclusion the perfect percutaneous needle is the successful key for biopsy in spine lesions, we should coordinate the relationship between imaging diagnosis and percutaneous bone biopsy.
On condition that other relevant techniques are perfect, the image quality of aerial imaging mainly depends on the control of the vibration and disturbance of aerial imaging systems.