Philips Azurion - 16.21.6 User Dose and Imaging Information for Cone Beam CT Reconstructions; Phantoms and Measurement Methods

• DAP-meter: < 0.5 mm Al.
•
Wedge lter: 1 mm brass (CuZn37 R-019; 22 mm Al equivalent at 75 kV/HVL 3.5 mm Al)
Depending on the selected procedure, an addional lter may also be applied by the system, with the
following values (for beam liming devices with idencaon number 9896 010 22xxx):
Addional Filt
er Number Filter Filtraon
1 0.1 mm Cu + 1.0 mm Al 4.0 mm Al (75 kV/HVL 3.5 mm Al)
2 0.4 mm Cu + 1.0 mm Al 11.0 mm Al (75 kV/HVL 3.5 mm Al)
3 0.9 mm Cu + 1.0 mm Al 21.5 mm Al (75 kV/HVL 3.5 mm Al)
The following table shows air kerma values as a percentage of the curves as a funcon of the addional
lt
er selecon.
kV Filter
Air Kerma Value (%)
No pr
otecon
0.5 mm lead
equivalence
1.0 mm lead
equivalence
1.5 mm lead
equivalence
110 0 100 100 100 100
1 66 87 85 76
2 38 69 64 53
3 19 49 47 32
90 0 64 33 34 46
1 39 27 24 31
2 19 20 15 17
3 8.5 12 9.0 9.2
70 0 35 6.0 13 22
1 18 4.1 7.2 12
2 7.1 2.4 3.1 4.6
3 2.3 1.3 1.0 1.9
The following table shows normalized air kerma values as a percentage of the curves as a funcon of
the addional lt
er selecon.
Addional Filt
er
Normalized Air Kerma Val-
ue (%)
0 100
1 120
2 135
3 150
16.21.6 User Dose and Imaging In
formaon for Cone Beam CT Reconstrucons
This secon provides informaon about cone beam CT reconstrucons.
Phantoms and Measurement Methods
Dose Phantoms
The CT Dosimetry Phantom is the phantom used to determine the dose delivered during a Cone Beam
CT acquision. The phantoms are circular cylinders of polymethyl methacrylate and are 15 cm long.
Their density is 1.19 ± 0.01 g/cc. The phantom for tesng CT imaging of the body has a diameter of 32.0
cm, and the phantom for the head has a diameter of 16.0 cm.
Technical Informaon Protecon Against Stray Radiaon
Azurion Release 1.2 Ins
trucons for Use 318 Philips Healthcare 4522 203 52421