Operating instructions

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CoronaryCTA
Contrast Medium
For homogeneous contrast enhancement in the coro-
nary arteries, optimized contrast protocols are manda-
tory.
The use of bolus tracking is helpful, with an automatic
start of the spiral scan as soon as a contrast threshold
of 100 – 120 HU has been reached in the ascending
aorta. Please note that correct placement of the ROI in
the ascending aorta is essential. An example for an
optimized contrast protocol is: Use 80 ml of contrast
agent with a density of 350 mg/ml at a flow rate of
4 ml/s followed by 80 – 120 ml of saline chaser at a
flow rate of 4 ml/s (double head injector).
The use of Test bolus: An example for an optimized
contrast protocol is: Use 10 ml of contrast agent with a
density of 350 mg/ml at a flow rate of 4 ml/s followed
by 60 ml at a flow rate of 4 ml/s of saline chaser (dou-
ble head injector). For the CTA use 80 ml of contrast
agent with a density of 350 mg/ml at a flow rate of 4
ml/s followed by 80 – 120 ml of saline chaser at a flow
rate of 4 ml/s (double head injector).
For further information on the Bolus Tracking Applica-
tion, please refer to the chapter "Contrast Medium".