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GE Revolution CT User Manual

GE Revolution CT
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If you use the GE reference protocol, image number one is at 5 seconds and the tick
marks are 2 seconds apart, as shown in the graph above.
d.
Add 3–4 seconds to allow for filling of the distal coronary vessels. The minimum total
time should be set to 24 seconds or greater.
In the example below, total time = 24 seconds. The value will be entered in the
Prep
Group Delay
fields in the
Timing
collection on the
Scan Settings
window, for the contrast
enhanced cardiac scan.
(7 tick marks × 2 = 14 seconds)
(+5 for prep group delay = 19 seconds for peak enhancement time)
(+4 for distal filling of vessels = 23 seconds)
(+1 additional delay to make total delay 24 seconds or greater = 24 seconds)
NOTE: If total time >= 24 seconds, no additional delay is required.
16. Click [Continue] to proceed to the next procedure.
2.6 Acquire a contrast enhanced cardiac scan
Use this procedure to acquire the contrast enhanced cardiac scan. This is the final scan before
transferring the images to the Advantage Windows Workstation.
1.
Confirm the ECG trace is strong and stable.
2. Select the
SFOV
:
NOTE: When a Cardiac SFOV is selected, dose is computed based on a 32 cm phantom.
SFOV Default (cm) Upper Limit (cm)
Cardiac Small
25 32
Cardiac Medium
25 36
Cardiac Large
25 50
3.
Position the scan lines to cover the complete heart from approximately 1 cm superior to the
left main coronary artery ostium to 1 cm inferior to the apex of the heart.
4. Confirm that a cardiac scan mode is selected.
5.
Review the heart rate measurements made during the breath hold recording, and the
ECG
and Gating
settings that were adjusted based on those measurements. If you have not
recorded a breath hold recording, do so now.
6. Review the
ECG and Gating
settings.
The data acquisition windows/parts indicate the portion or portions of the cardiac cycle
that will be imaged.
When using Auto Gating, the acquisition windows/parts will change depending on the
patient's heart rate during the most recent ECG recording during a breath hold.
7. Arrhythmia Management
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
342 2 Cardiac Workflow

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GE Revolution CT Specifications

General IconGeneral
Detector CoverageUp to 160 mm
Gantry Tilt± 30 degrees
Spatial ResolutionUp to 0.23 mm
Scan RangeUp to 200 cm
X-ray Tube CurrentUp to 800 mA
TypeComputed Tomography (CT) Scanner
Rotation Speed0.28 seconds per rotation
Tube Voltage80 kV to 140 kV
Number of Detector Rows256
Power Requirements480 VAC, 3-phase
Detector Rows256
Coverage160mm

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