GE Revolution CT User Manual page 335

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Keep the electrodes as far away as possible from the scan field of view.
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Place the two upper electrodes directly on the middle portion of the patient's clavicle.
Move the electrodes towards the arms to produce a better signal, if needed.
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Place the two lower electrodes at the bottom of the rib cage.
9. Review the ECG waveform. Ensure the patient's heart rate is within allowable system limits
for scanning: 30–200 beats per minute.
a. If the internal ECG trigger device is selected and active, you can display the ECG status
area by selecting the ECG waveform icon using the back, forward and enter keys on the
gantry.
b. If the external ECG trigger device is selected and active, the ECG waveform will display
on the external device only. It will not display on the gantry display.
10. If the ECG waveform looks noisy and/or improper R-peak triggering occurs at any time prior
to the diagnostic scan series, use the impedance measurement utility on the ECG trigger
device to ensure proper electrode connection. See
Reposition any electrodes with poor electrode connection and recheck the impedance value.
After repositioning any electrodes, initiate another impedance measurement. Repeat this
process until all electrodes indicate successful impedance measurements.
11. Check the waveform. The more abnormal the waveform, the less chance for a successful
cardiac exam. A calm patient keeps the heart rate steady with a repeatable rhythm. A
significantly varying heart rate can result in non-diagnostic images. A low and stable heart
rate typically allows for a high-quality study with low radiation dose.
Chapter 13 Cardiac
Illustration 1: Recommended Electrode Placement
Electrode
RA
LA
RL
LL
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Description
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Section 2.2.
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