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Fig. 6 —Correlation chart shows tube currents determined by different
parameters and by corrected SD of CT attenualtion values. Patients are sorted
by weight (red line). SD values of unenhanced images obtained at
corrected tube current are displayed at bottom of chart (transverse line at
bottom). Blue line indicates actual tube current modulated by SD values and
shows wide range of differences from fixed tube current at 400 mA (transverse
line at top) and tube currents that would have been modulated by patient
weight (transverse line with three steps to indicate 10-kg increments). Graph
indicates poor correlation between is and SD values in patients at all levels
of body weight. Using fixed mA of 400 mA or modulating mA by patient body
weight are recommended by manufacturer (Aquilion 64, Toshiba Medical Systems),
mA SD = mA modulated by SD values, mA weight = mA modulated by body weight,
Fixed mA = mA fixed at 400 mA. SD correct = SD values measured from images
obtained with adjusted mA.
