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 2,5
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
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