MI-42-0001 Rev. 19 235
CT USER INFORMATION: Dosage Factors and Image Quality
CTDI Per Condition
of Operation
CTDI
100
(center) for different selectable CT conditions of operation. The value at 120kV, 192 mAs
is treated as 1.00, and other measurements are normalized to this value. Conditions of operation
selected are the minimum, midrange and maximum values of voltage (80, 100, and 120 kV) and tube
current - time product (48, 96, 192 and 240 mAs).
Phantom kV mA sec mAs mGy
Normalized
mGy
Body
80 25 1.92 48 0.85 0.07
100 25 1.92 48 1.80 0.14
120 25 1.92 48 3.14 0.25
Head
80 25 1.92 48 2.89 0.09
100 25 1.92 48 5.47 0.16
120 25 1.92 48 8.42 0.25
Body
80 50 1.92 96 1.71 0.14
100 50 1.92 96 3.60 0.29
120 50 1.92 96 6.27 0.50
Head
80 50 1.92 96 5.79 0.17
100 50 1.92 96 10.93 0.32
120 50 1.92 96 16.85 0.50
Body
80 100 1.92 192 3.41 0.27
100 100 1.92 192 7.21 0.57
120 100 1.92 192 12.54 1.00
Head
80 100 1.92 192 11.58 0.34
100 100 1.92 192 21.87 0.65
120 100 1.92 192 33.69 1.00
Body
80 125 1.92 240 4.27 0.34
100 125 1.92 240 9.01 0.72
120 125 1.92 240 15.68 1.25
Head
80 125 1.92 240 14.47 0.43
100 125 1.92 240 27.33 0.81
120 125 1.92 240 42.12 1.25
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