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Dosimetry
Operator Manual
SPR8-230.621.01.03.02 96
of 106
Lower extremities
Sensitivity class
The sensitivity of the film screen system is determined by the dose required for
attaining an optical density of 1.0 (over fog density and film base). The sensitivity
classes are pre-defined ranges, mostly differentiated by a factor of 2. The higher
the numerical value of the sensitivity class (e.g. 200), the lower the dose required.
Object Position SID KV mAs Grid Sensitivity
class
Neck of femur axial 105 70 20 w.o. 200
Femur a./lat. 105 70 12.5 w.o. 200
knee a. 105 55 6.3 w.o. 200
knee lat. 105 55 5 w.o. 200
Menisc 105 55 3.2 w.o. 200
Patella a./lat. 105 55 3.2 w.o. 200
Leg axial 105 55 3.2 w.o. 200
Ankle a. 105 55 4 w.o. 200
Ankle lat. 105 52 3.2 w.o. 200
Heel bone lat. 105 52 2.5 w.o. 200
Heel bone axial 105 52 5 w.o. 200
Foot lat. 105 52 1.6 w.o. 200
Metatarsus d.pl. 105 52 2 w.o. 200
Metatarsus obl. 105 52 2 w.o. 200
Toes 105 52 1.25 w.o. 200
Position:
SID = Source-Image Distance (cm)
a. = anterior
lat. = lateral
obl. = oblique
d.v = dorso-volar
d.pl. = dorso-plantar
w. = with grid
w.o. = without grid