Acquire A Scan Without Dynamic Transition; Baseline Phase Without Dynamic Transition - GE Revolution CT User Manual

automatically when the HU value of the Transition ROI reaches the Enhancement
Threshold. This is the magnitude of the change in HU level with respect to the HU level
in the baseline scan.
○ Auto Minimum sets the Diagnostic Delay to the minimum value possible, taking into
consideration location of the monitor phase, start phase location, and AutoVoice pre-
message length. When Auto Minimum is set, the Diagnostic Delay value is read only.
Use this to see the minimum delay value for your specific scan.
○
Diagnostic Delay, (up to 60 seconds in one-second increments) typically set to the
minimum value (automatic) for arterial studies and 10 seconds or longer for venous
studies. The minimum value is constrained to the time needed to move the table and
play the auto-voice message. The minimum for scans without AutoVoice and no table
move is about 1.1 seconds.
■
Allow enough time to deliver breathing instructions if you are not using AutoVoice.
■ The minimum time may vary if AutoVoice is on and depending on the monitor
location relative to the start location.
○ AutoVoice is available if AutoVoice is prescribed in the diagnostic scan. If AutoVoice is
enabled for the series, the pre-message will be played as part of the diagnostic delay.
The diagnostic delay will be increased to accommodate the length of the AutoVoice
message. Autovoice is not editable from the Baseline setup screen. Make any changes
to it in the diagnostic settings.
5. Set the contrast settings. If the integrated injector option is enabled, see the Enhanced
Xtream Injector section in this chapter. If the integrated injector option is not enabled, see
the Enter Contrast Description section in the Scan chapter.
SmartPrep Setup window, click [Acquire Baseline].
6. From the
7. Review and respond to the potential alert message that indicates that the projected dose
efficiency had fallen below 70%.
8. Proceed to Acquire a scan without Dynamic Transition or Acquire a scan with Dynamic
Transition.

3.4 Acquire a scan without Dynamic Transition

To acquire contrast-enhanced images with a bolus tracking technique without Dynamic
Transition, follow these steps:

3.4.1 Baseline Phase without Dynamic Transition

The baseline scan is taken as a standard axial scan with one rotation and one image and allows
you to establish an area to monitor contrast enhancement.
1. After the SmartPrep settings are confirmed, the Baseline scan is taken. When the Baseline
scan is complete, the
2. Review the values on the
3. If the baseline scan is not correct (for example if the patient moved or the scan location is
not right), click [Retake Baseline] and return to
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Monitor Phase Setup window displays.
Scan Timeline for the monitor and scan phases.
Revolution CT User Manual
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Section 3 Set up a SmartPrep series.
3 SmartPrep