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OPERATOR’S MANUAL • Owandy-RX DC • 02/2020 • NXDCEN160A
Operator’s manual – Owandy-RX DC
ANNEX 4
A4. DOSIMETRIC INDICATIONS
The radiation exposure is reported in terms of Dose Area Product (DAP), which takes into account the entire area of the
X-ray beam and the total amount of X-ray radiation incident on the patient. The DAP is obtained by multiplying the Air
Kerma by the corresponding X-ray beam area, which is dependent by the typology of beam limiting device installed. It
is independent by the measured location, because increases in beam area are compensated by the reduction of beam
intensity (inverse square law).
The dosimetric values reported here are relevant to the following measured values of Total Filtration and Half Value
Layer (HVL):
kV
HVL (mm Al)
Total Filtration (mm Al)
60
1,9
2,4
70
2,2
2,4
In the following tables the radiation exposure is indicated in terms of DAP [mGy cm2] for each setting of kV, beam limiting
device length (SSD) and Beam Limiting Device type (circular or rectangular).
As per paragraph 203.6.4.5 of the IEC 60601- 2-65, the overall deviation from the estimated air kerma is within 50%.
BLD Shape
Circular
SSD (mm)
310
kV
60
70
mA
4
8
4
8
Time (s)
DAP (mGy*cm2)
0,02
0,932588
1,865177
1,192094
2,384188
0,025
1,165736
2,331471
1,490118
2,980235
0,032
1,492142
2,984283
1,907351
3,814701
0,04
1,865177
3,730354
2,384188
4,768376
0,05
2,331471
4,662942
2,980235
5,960471
0,063
2,937654
5,875308
3,755096
7,510193
0,08
3,730354
7,460708
4,768376
9,536753
0,1
4,662942
9,325885
5,960471
11,92094
0,125
5,828678
11,65736
7,450588
14,90118
0,16
7,460708
14,92142
9,536753
19,07351
0,2
9,325885
18,65177
11,92094
23,84188
0,25
11,65736
23,31471
14,90118
29,80235
0,32
14,92142
29,84283
19,07351
38,14701
0,4
18,65177
37,30354
23,84188
47,68376
0,5
23,31471
46,62942
29,80235
59,60471
0,63
29,37654
58,75308
37,55096
75,10193
0,8
37,30354
74,60708
47,68376
95,36753
1
46,62942
93,25885
59,60471
119,2094
1,25
58,28678
116,5736
74,50588
149,0118
1,6
74,60708
149,2142
95,36753
190,7351
2
93,25885
186,5177
119,2094
238,4188
