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USER MANUAL • Owandy-RX AC • 02/2020 • NXACEN160A
User Manual – Owandy-RX AC
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)
70
2,0
2,3
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%.
Cone type
Circular Long
Short Circular
Rectangular Long
SSD (mm)
310
200
310
kV
70
70
70
mA
8
8
8
Time (s)
DAP (mGy*cm2)
DAP (mGy*cm2)
DAP (mGy*cm2)
0,08
5,559
13,597
3,458
0,1
6,949
16,996
4,323
0,125
8,686
21,246
5,403
0,16
11,118
27,194
6,916
0,2
13,897
33,993
8,646
0,25
17,372
42,491
10,807
0,32
22,236
54,388
13,833
0,4
27,795
67,986
17,291
0,5
34,744
84,982
21,614
0,63
43,777
107,077
27,234
0,8
55,590
135,971
34,582
1
69,487
169,964
43,228
1,25
86,859
212,455
54,035
1,6
111,179
271,942
69,165
2
138,974
339,928
86,456
2,5
173,718
424,910
108,070
3,2
222,358
543,885
138,329
