4746
X-ray Source Focal Spot
X-ray
Beam
X-ray Source Focal Spot
Rectangular Axis at 90
o
to Target Receptor
NOTE: The Rectangular Collimator Cone Adapter dimensions are contained entirely within the
6 cm circular exit field diameter. This collimator can rotate freely, 360 degrees. Use rectangular
Collimator with rectangular film and sensors to reduce the dose by 57% versus using the 6cm
diameter circular cone.
Area of rectangular collimator is 3cm x 4cm = 12cm
2
Circular collimator area is π x (6cm/2)
2
= 28.27cm
2
Optional
Rectangular Collimator
Exit Field Size
3 cm x 4 cm
Center
Location
of X-ray
Source
Focal Spot
Rectangular Collimator
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