990400 Rev C 2010 May 1
Quality Assurance
12-17
15. The image above is an example of a system properly aligned for
PAN scanning. All but two of the metal balls are circular in
shape.
16. The image above is an example of a system that is not properly
aligned for PAN scanning. This is easily seen by the fact that
only two metal balls are circular. Elongation of the Metal Balls
indicate that the phantom is not in the middle of the focal trough
due to poor chair alignment.
17. Check chair alignment if all seven balls do not appear circular.
Radiation Output Test
It is recommended that a check of the kVp(eff) and Radiation Output
of the X-ray source be performed annually by a qualified Physicist.
The incident Absorbed Dose at the detector may be measured using
a dosimeter. Tests are performed to assess output value and to check
for tube output consistency and timer accuracy.
1. Attach a dosimeter to the detector such that the sensor is
positioned where the vertical (coronal) and horizontal (axial)
lasers intersect.
2. Perform a Diameter 16cm scan 8.9 second, Height 13 cm, 0.4
voxel and record time and dose from meter.
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