Operating instructions

Children
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8.Applications with 80 kV: For CTA protocols, the tube
voltage was set to 80 kV and the mAs values were
raised by a factor of 1.5 over the reduced 120 kV val-
ues. This measure roughly reduces the dose by another
factor of 2. At a lower kV, substances with a high
atomic number (such as iodine) have a significantly
higher CT value (= vascular contrast). Iodine CT values
at 80 kV are about 50% higher than at 120 kV.
80 kV was also used for applications when the lowest
achievable mAs at 120 kV was still higher than neces-
sary for sufficient noise level (for technical reasons,
generators need to operate at a certain minimum cur-
rent for stable operation). For applications such as
neonate or airway scanning, the low tube output at 80
kV can be used to further reduce the dose to the
patient.
9.To further optimize MPR image quality we recom-
mend that you reduce one or more of the following:
collimation, reconstruction increment and slice width
for image reconstruction.