GE Revolution CT User Manual page 358

Table 1: Auto Gating Configuration Window
Number
1
2
3
4
5
6
Scan Settings
The title bar of the
Average Heart Rate (BPM) / Heart Rate Rhythm category table.
Table 2: Cardiac Axial Parameters
Name
Slowest Allowable Rotation Speed
Acquisition Part 1
Acquisition Part 2
Acquisition Part 3
Widen for SSF
HR Variation Type
HR Variation Amount
358
Name
Profile / Profile Name area
Average Heart Rate (BPM) /
Heart Rate Rhythm category
table
Threshold area
Scan Settings area
[Save]
[Exit]
Scan Settings area is updated with the exact boundaries selected in the
Description
Slowest gantry speed that would be suggested if prescribed Noise Index cannot be
achieved by SmartmA.
Defines the phases of the cardiac cycle that will be acquire during the scan, and the
relative mA (%) that will be applied for each part of the cardiac cycle.
Acquisition Parts can be defined in R-R % or ms offset from prior R-peak.
Enabling this feature directs the system to acquire data so a SSF image may be gen‐
erated at the specified cardiac phases or times.
For background information about R-wave, R-wave to R-wave, and % phase, see the
Cardiac Phase Background section.
Inputs to calculate
HR Variation Type : Select Scale Factor or Absolute Value .
HR Variation Amount : Values are applied as scale factor if Scale Factor is selected
or as absolute values in BPM if
HR Variation Allowance defines the additional X-ray on interval that will be applied to
the scan to accommodate a possible discrepancy between the predicted heart rate
and the actual heart rate when the system is acquiring data.
Direction 5480385-1EN, Revision 1
Description
• Profile : Select a User Profile to define parameters for heart
rate and variability for the categories you want to set up.
• Profile Name : Rename the 20 editable User Profiles.
Create heart rate and variation categories.
Variable Beat to Beat Threshold , Irregular Threshold and
Define
Highly Irregular Threshold .
These thresholds define how Auto Gating will categorize the pa‐
tients HR (based on breath hold recording).
• Variable Beat to Beat Threshold : Max beat to beat variability
HR Rhythm is classified as "Variable".
before the
• Irregular Threshold : Max number of irregular beats before
HR Rhythm is classified as "Irregular".
the
• Highly Irregular Threshold : Max number of irregular beats
HR Rhythm is classified as "Highly Irregular".
before the
Define scan parameters for Cardiac scans.
See Cardiac Scan Parameters .
Saves parameter changes.
Closes the window.
HR Variation Amount in BPM.
Absolute Value is selected.
Revolution CT User Manual
5 Auto Gating