" As for technical glitches, Mr. Lieber says, "There is a range of systems out there, just as in every kind of product line, ranging from poor to mediocre to excellent."

The theoretical models of point target, extended target and line target are established based on the concept of equivalent scattering area and laser ranging equation.

Routine CT scanning was carried out ranging from diaphragm to pelvic entrance, sometime suitable CT scan range was added in line with clinical need.