Operating instructions

Workflow Information
97
IV Injection*
The administration of a contrast medium depends on
the indication and on the delay times to be used during
the examination. The patients weight and circulatory
situation also play a role. In general, no more than 3 ml
per kg of body weight for adults and 2 ml per kg of
body weight for children should be applied.
For a CTA study (arterial phase), the principle is to keep
the contrast flowing throughout the duration of the
scan. Thus, the total amount of contrast medium
needed should be calculated with the following for-
mula:
CARE Bolus or Test Bolus may be used for optimal con-
trast bolus timing. Please refer to the special protocols.
To achieve optimal results in contrast studies, the use
of CARE Bolus is recommended. In case it is not avail-
able, use Test Bolus. Once completed, load images into
Dynamic Evaluation for calculation of Time to Peak
enhancement.
For multiphase examinations, e.g. three-phase liver,
the maximum start delay can be set to 600 sec. The
countdown of the delay always starts after scanning of
the previous phase.
*For more information regarding the general use of
drugs and doses mentioned in this guide, please
refer to page 2.
CM = (start delay time + scan time) x flow rate.