Philips Azurion - Tomographic Section Thickness; CTDi Dose Measurements; XperCT Dose Profile

Figure 144 XperC
T modulaon transfer funcon simulaon and measurement
Legend
1 Modulaon tr
ansfer funcon (%) 5 3D-RX processing
2 Spaal frequency in the isocenter (lp/mm) 6 Detector
3 Measured modulaon transfer funcon 7 Focal spot blur
4 Total simulaon
Tomographic Secon Thickness
Cone Beam C
T reconstrucon yields isotropic volumes based on scans made with a square-pixels
detector, therefore the MTF along the rotaonal axis is the same as the MTF in axial slices.
CTDi Dose Measurements
Dose measurements for some typical Cone Beam CT acquision protocols are shown in the table
below.
Phantom Acquision Pr
otocol CTDi (mGy)
CTDI Head XperCT LD 30fps -10s 22
XperCT HQ 30fps -21s 45
CTDI Body Abdomen XperCT Prop LD - 5s 14
Abdomen XperCT Prop HQ -5s 29
Abdomen 3D-RA Prop scan 4s 21
Abdomen 3D-RA Roll scan 8s 21
XperCT Dose Pr
ole
The gure below shows a dose prole for an XperCT acquision protocol.
Technical In
formaon Protecon Against Stray Radiaon
Azurion Release 1.2 Ins
trucons for Use 321 Philips Healthcare 4522 203 52421