GE Revolution CT User Manual page 343

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When using Auto Gating and an irregular heart rhythm is detected either during the last
breath hold or during the previous few minutes, the system may scan the patient two
times, to increase the likelihood for a clinically successful scan. The Auto Gating Profile
determines if this setting is enabled or disabled. The user has the ability to change this
setting by disabling Auto Gating and changing the Arrhythmia Retrigger setting.
○
This is indicated by a value of two scans.
○
This value can be changed after setting Auto Gating to "Off". Change this value if it is not
appropriate.
8. Enter the prep delay that you determined from the MIROI timing bolus scan. The typical prep
delay time is Peak + 9 seconds, assuming the time bolus scan had a prep delay of 5
seconds.
9. The primary reconstruction for the scan series and may influence scan parameters. If
needed, prescribe additional secondary reconstructions.
Contrast collection, enter the contrast description and amount for the IV Contrast
10. From the
setting.
Alternatively, you may choose one of any preset items from the list.
11. Program the contrast injector.
○
The protocol to use varies depending on the contrast type, patient size, and injector
capability.
○
Consider adjusting the volume of contrast on the second phase to ensure a 6 second
range from the end of the contrast injection to the start of X-ray on. This delay time
ensures that if using saline, you are getting the advantage of the saline bolus in the right
chamber. If you start the scan too soon, you will not see enough saline flush through the
SVC. If you start the scan too late, you will completely flush out the right chamber.
○ The time delay from the end of the contrast injection (3) to the start of the scan (5)
should not exceed 6 seconds.
○ Skip the next step if SmartPrep is not selected.
Number
Chapter 13 Cardiac
1 22 second prep delay
2 Phase 1
3 Phase 2
Illustration 9: Time Delay
Description
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
343