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syngo CT 2007E Emotion Operator Manual
02/2008
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CTDI Test Quality Assurance
F.4-4
Performing the CTDI test
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In the CTDI measurement, the CTDI value at the center and 1 cm
below the surface of 16 cm and 32 cm PMMA phantoms is
measured with a dosimeter.
F.4
Preparing for measurement
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First perform measurements with the 16 cm CTDI head phan-
tom. Measurements with the 32 cm CTDI body phantom are
performed in the same way.
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✧ Mount the 16 cm CTDI head phantom at the head end of
the patient table.
✧ Position the phantom in the center of the slice plane using
the laser light markers.
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F
The slice plane of the gantry must go through the center of the
phantom (tolerance 2 mm) in the Z direction. Check this with
the laser lightmarker.
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✧ Note down the ambient temperature for the test protocol.
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F
The measured values determined with the ionization chamber
are temperature dependent. The results of the CTDI measure-
ment must therefore be referred to the current ambient temper-
ature.
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