Siemens SIREMOBIL Compact L - Dose Measurement; Calculating the Area Dose Product

SIREMOBIL Compact SPR2-130.061.02 Page 24 of 30 Siemens AG
System Manual Rev. 11 09.04 CS PS 24 Medical Solutions
5 - 24 Adjustments / Programs
• Release fluoroscopy briefly, adjusting the iris on the radiation field to a format of approx.
8 cm.
• Do not make any further adjustments to the iris.
• Record the diameter (Fig. 8) of the octagonal area of the radiation field.
• Remove the center cross.
• Attach and center the small (1cm
3
) dose measurement chamber of the dose measure-
ment device onto the image intensifier (Fig. 7).
• Release fluoroscopy briefly. The radiation field must cover the entire area of the dose
measurement chamber.
• Select kV STOP and enter 70 kV.
Dose measurement 5
• Press the >0< key twice to reset the area dose product on the SIREMOBIL monitor to 0.
• Reset the dose measurement device to 0 .
• Release fluoroscopy for approx. 5 seconds. The measured dose K
E
should be high
enough that the uppermost measurement range of the dose measurement device
(Dali, Nomex...) is utilized fully. If necessary, reset the area dose product display on the
Siremobil and the dose measurement device and repeat the measurement with a differ-
ent fluoroscopic time.
• Record the measured dose.
• Record the area dose product displayed on the Siremobil monitor (FDPa).
Calculating the area dose product 5
• To calculate the measured area dose product:
(measured area dose product FDPg) = (measured dose K
E
) * (diameter)
2
* 0.829.
The radiation field must cover the entire area of the dose mea-
surement chamber.
NOTE