KaVo 3D eXam, Руководство оператора

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Kavo 3D eXam ® Operators’ Manual
k990400 September 19, 2007
11-2
Conditions of Operation – 9 and 27 Second Scans
All data was acquired using Victoreen Model 450P Survey Meter (S/N 3159) in
integrate mode. The data was acquired in concentric circles of radii listed in table
below A lab head phantom was placed within the beam to act as the scattering agent.
The Survey Meter was placed at a height of 112 cm [44 in] while the mid-point of
the beam exit window was located 118 cm [46.5 in] above the floor. The detector
was in the portrait position and X-ray field was at its maximum opening.
Locations listed in the table are for 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315°.
Looking out from the system 0° was located directly in front (A location).
This table consists of data gathered with the system operating at 120 kVp, 5 mA
with an assumed use and occupancy factor of 1 and the following parameters:
Estimated usage: 10 scans per week yielding a workload of 16.7 mA-min/week
25 scans per week yielding a workload of 41.7 mA-min/week
50 scans per week yielding a workload of 83.3 mA-min/week
Total scan time: 9 seconds
Location
Distance in
Feet
[meter]
Exposure
(mR)
Exposure
(
μ
R)
10
scans/wk
mR/wk
25
scans/wk
mR/wk
50
scans/wk
mR/wk
0
o
(A)
3 [0.91m] 0.120 119.81 1.20 3.00 5.99
6 [1.82m] 0.035 34.94 0.35 0.87 1.75
9 [2.74m] 0.018 18.47 0.18 0.46 0.92
45
o
3 [0.91m] 0.140 139.77 1.40 3.49 6.99
6 [1.82m] 0.041 41.43 0.41 1.04 2.07
9 [2.74m] 0.023 23.46 0.23 0.59 1.17
90
o
(B)
3 [0.91m] 0.140 139.77 1.40 3.49 6.99
6 [1.82m] 0.055 54.91 0.55 1.37 2.75
9 [2.74m] 0.018 17.97 0.18 0.45 0.90
135
o
3 [0.91m] 0.015 15.47 0.15 0.39 0.77
6 [1.82m] 0.010 10.48 0.10 0.26 0.52
9 [2.74m] 0.006 5.99 0.06 0.15 0.30
180
o
(C)
3 [0.91m] 0.062 61.90 0.62 1.55 3.09
6 [1.82m] 0.017 17.47 0.17 0.44 0.87
9 [2.74m] 0.008 8.49 0.08 0.21 0.42
225
o
3 [0.91m] 0.014 13.98 0.14 0.35 0.70
6 [1.82m] 0.006 6.49 0.06 0.16 0.32
9 [2.74m] 0.003 3.49 0.03 0.09 0.17
270
o
(D)
3 [0.91m] 0.140 139.77 1.40 3.49 6.99
6 [1.82m] 0.038 37.94 0.38 0.95 1.90
9 [2.74m] 0.014 14.48 0.14 0.36 0.72
315
o
3 [0.91m] 0.110 109.82 1.10 2.75 5.49
6 [1.82m] 0.030 30.45 0.30 0.75 1.52
9 [2.74m] 0.013 13.48 0.13 0.34 0.67
1 meter above
0.004 4.49 0.04 0.11 0.22
1 meter above and 1
0.011 10.98 0.11 0.27 0.55