Mobius AIRO Mobile CT System - Page 246

234 MI-42-0001 Rev. 19
CT USER INFORMATION: Dosage Factors and Image Quality
CTDI Measured
Around Axis of
Rotation
CTDI
100
(center):
CTDI measured 1
cm below the
surface
CTDI
100
at 1 cm interior to phantom surface, at the location where the exposure is maximum
obtainable at this depth. This is the entrance location directly above the
center of the phantom, and
designated as the 12 o’clock position (if the phantom is viewed from the front of the scanner; i.e. the
side of the Ring where the patient table
is attached).
CTDI Measured at
Other Angles
CTDI
100
at positions 90˚, 180˚ and 270˚ from the 12 o’clock position, designated here as the 3
o’clock, 6 o’clock and 9 o’clock positions, respectively.
Average CTDI CTDI
100
as the average of the 4 entrance locations (
CTDI
100
peripheral):
Phantom
kV mA sec mAs
Position Center,
mGy
Body 120 100 1.92 192 12.54
Head 120 100 1.92 192 33.69
Phantom kV mA sec mAs
Entrance,
mGy
Positions
Body 120 100 1.92 192 46.33 12 o’clock
Head 120 100 1.92 192 45.58 12 o’clock
Phantom kV mA sec mAs
Entrance,
mGy
Position
Body
120 100 1.92 192 37.48 3 o’clock
120 100 1.92 192 29.43 6 o’clock
120 100 1.92 192 33.42 9 o’clock
Head
120 100 1.92 192 41.74 3 o’clock
120 100 1.92 192 35.47 6 o’clock
120 100 1.92 192 38.85 9 o’clock
Phantom kV mA sec mAs Peripheral mGy
Body 120 100 1.92 192 36.66
Head 120 100 1.92 192 40.41