Kavo 3D eXam ® Operators’ Manual
k990400 September 19, 2007
11-6
(f) appropriate to the task at hand to convert exposure (R) to
absorbed dose (rad):
i
0.78 rad/R for comparison to FDA-required,
manufacturer-reported data (Lucite), and this is also
appropriate for acrylic
i
0.93 or 0.98 rad/R for patient dose estimates (tissue or
water)
i
0.87 rad/R for calculation of, or comparison to, CTDIw
(air)
•
10 (cm) = the active length of the pencil-beam ion chamber
•
NST = vertical dimension of the beam (6 cm)
9. Repeating these steps for different slice thicknesses is not
required as this is not applicable to the 17-19 Cone Beam
Volumetric Tomography technology.
10. Repeat for chamber in peripheral locations (1 cm interior to the
surface of the phantom) with all other holes filled with acrylic
rods.
Measurements
The following table consists of data gathered with the system 27s
scan, 120 kVp, and 5mA. For completeness, the CTDI values are
calculated for all the three
f
factors given above.
radR Factor =
0.78
0.87
0.93
mrad
mGy
mrad
mGy
mrad
mGy
Center
238.2
2.38
265.7
2.66
284.0
2.84
Back Periphery
254.4
2.54
283.8
2.84
303.3
3.03
Left Periphery
220.2
2.20
245.6
2.46
262.5
2.63
Right Periphery
215.4
2.15
240.3
2.40
256.8
2.57
Front Periphery
172.2
1.72
192.1
1.92
205.3
2.05
Содержание 3D eXam
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