SSD - SOURCE TO SKIN DISTANCE
and FOCAL SPOT POSITION
The position of the focal spot, together with the target angle and the reference axes are shown in the gure below:
LONG CONE (cylindrical and rectangular)
SHORT CONE (cylindrical and rectangular)
The tolerances of the focal spot on the reference axes are ± 0.5mm
Dimensions of the area of the x-ray beam output according to the shape of the beam limiting device:
Cylindrical Beam Limiting device Ø≤60 mm
Rectangular Beam Limiting device 44x35 mm