MI-42-0001 Rev. 19 247
CT USER INFORMATION: Dosage Factors and Image Quality
Effect of Radiation
Detector on Image
The radiation detector is used to normalize the detector data. This minimizes artifacts due to
variations in intensity of the x-ray source.
Half-Value Layers Half-value layers (HVL) were measured using a Radcal 202
6 with its 20X6-6 ion chamber placed at
isocenter.
Filter Properties 4.99 mm Al @ 80 kVp, HVL 4.6 mm Al
There are no other user selectable filters on AIRO, including shaped filters for head protocols.
Protection Against
Re
sidual Radiation
The Ring-side radiologic exposure is 5.7% and 8% of the corresponding exposures on the axis of
rotation, thereby
meeting the IEC 60601-11 requirement of <25%
Parameter Value
Tube Current 25 mA
Beam-on Time 2 sec (50 mAs)
kV 80 100 120
mm Al mR
0 489 811 1182
3 838
4 264.4 755
5 231.4 435
6 391 629
7
8 522
Half exposure 244.5 405.5 591
Measured HvL, mm Al 4.6 5.7 6.7
Minimum Required, mm Al 2.9 3.6 4.3
To Next Page
Loading...