Make sure the selected ECG trigger device is connected and active.
Display Icon
Description
Internal ECG trigger device is selected.
External ECG trigger device is selected.
NOTE:
You can change the selected ECG trigger device (internal or external) from the
tool menu on the gantry display. See
5. Place the patient’s arms above their head and elevate with pillows or sponges.
Do not place the arms flat on the table or gantry. This position can limit vessel flow and
cause arm and shoulder motion. As the table moves into the gantry during the scan, it tends
to cause the patient to arch his back, raising the chest and causing incorrect registration
artifacts.
6. With the patient's arms above his head, place the RA and LA electrodes over the clavicles.
Do not place any electrodes over muscle, scar tissue, or hair for the following reasons:
○
Muscle: The ECG can register muscle electrical activity due to the above head arm
position. Help the patient relax his arms and reduce shoulder muscle fatigue.
○
Scar tissue: This is denser than normal tissue, which makes it difficult to get a good
signal. If the patient has scar tissue in the shoulder area, place the electrode out onto
the patient's arm. In the chest area, place the electrode where there is no scar tissue.
○
Hair: Electrodes placed over a very hairy area do not allow good skin contact. If
necessary, shave a 4 inch square area for electrode placement.
7. To remove any lotion or oils, gently scrub the electrode location with cotton gauze until the
skin is a healthy pink. Do not use alcohol to prepare the electrode area.
8. With the patient in the scan position (arms above the head), apply the ECG electrodes and
leads to the patient no more than 5–10 minutes before the scan.
Follow these guidelines:
○
Use GE recommended electrodes: Dyna/Trace1500 by ConMed. Electrode ordering
information is found on the top of the IVY monitor or in the Integrated Cardiac Module
(ICM) Operator Manual. Using other electrodes can result in gating errors that can lead
to non-diagnostic images.
○
Use electrodes made for short-term monitoring (for example: exercise monitoring). Do
not use electrodes used for long-term monitoring.
○
Always use new ECG electrodes (radiotranslucent with silver/silver chloride) with a fresh
gel pad. Dry or expired electrodes can result in poor signal conduction that can cause
intermittent triggering.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
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2 Cardiac Workflow
