Philips Azurion - 16.19.2 Fluoroscopy and Exposure Time to Reach the 2 Gy Limit

Paent Thickness 20 cm PMMA 30 cm PMMA
System X-ray Protocol
Ref. AK (mGy/
img) AK (mGy/img)
C12/F12 Cardiac Le Cor
onary 15fps Normal 0.196 0.912
Head Cerebral 2fps Normal 5.051 14.068
Lungs Lungs 3fps 2.522 7.491
C12/F12 with ClarityIQ
(opon)
Cardiac Le Coronary 15fps Low 0.037 0.205
Head Cerebral 2fps Low 1.021 6.865
Lungs Lungs 3fps 1.259 6.589
Measurement c
ondions: paent type: default, eld size: 30 cm. All other sengs are in accordance
with Reference Air Kerma Measurement Setup (page 311), except for the dierent phantom
thicknesses.
16.19.2 Fluoroscopy and Exposure Time to Reach the 2 Gy Limit
To reduce the risk of skin injuries, it is important to know aer approximately how much uoroscopy or
exposure me the 2 Gy air kerma value will be reached (according to IEC 60601-1-3:2008, 5.2.4.5b).
The me remaining unl the 2 Gy limit is reached for each study is displayed in the status area. For
more informaon, see Status Area (page 358).
The number of exposure frames to reach 2 Gy (assuming no uoroscopy) can be calculated by dividing
2000 mGy by the reference air kerma value per frame (as given in Typical Reference Air Kerma (Rate)
Values (page 295), in mGy/img, for some of the most frequently used procedures).
The duraon to reach 2 Gy in minutes is determined by dividing the number of exposure frames by the
frame rate (fps) of the procedure, and dividing this by 60.
For uoroscopy, the duraon to reach 2 Gy in minutes (assuming no exposures) is determined by
dividing 2000 mGy by the reference air kerma rate given in Typical Reference Air Kerma (Rate)
Values (page 295) and dividing this by 60.
The following example shows the number of exposures and me required to reach the 2 Gy limit, for a
few typical exposure sengs, and for a normal and an obese paent:
Paent Thickness 20 cm PMMA 30 cm PMMA
System X-ray Protocol
Ref. AK
(mG
y/
img)
# Exp.
Needed
Time at
constant
fps
Ref. AK
(mGy/
img)
# Exp.
Needed
Time at
constant
fps
C12/F12 Cardiac Le Cor-
onary
15fps
Normal
0.196 10185 11 min 0.912 2194 2.4 min
Head Cerebral 2fps Nor-
mal
5.051 396 3.3 min 14.068 142 1.2 min
Head Cerebral 4fps Nor-
mal
5.049 396 1.7 min 15.413 130 0.5 min
Lungs Lungs 3fps 2.522 793 4.4 min 7.491 267 1.5 min
C12/F12
with
ClarityIQ
(opon)
Cardiac Le Cor-
onary
15fps
Low
0.037 53339 59 min 0.205 9766 11 min
Head Cerebral 2fps Low 1.021 1958 16 min 6.865 291 2.4 min
Head Cerebral 4fps Low 1.020 1961 8.2 min 5.914 338 1.4 min
Lungs Lungs 3fps 1.259 1589 8.8 min 6.589 304 1.7 min
The following example shows the me r
equired to reach the 2 Gy limit, for a few typical uoroscopy
avor sengs, and for a normal and an obese paent:
Technical Informaon System Sengs Inuencing the Radiaon Dose
Azurion Release 1.2 Ins
trucons for Use 294 Philips Healthcare 4522 203 52421