GE Revolution CT - Page 358

Table 1: Auto Gating Configuration Window
Number Name Description
1 Profile / Profile Name area
•
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.
2 Average Heart Rate (BPM) /
Heart Rate Rhythm category
table
Create heart rate and variation categories.
3 Threshold area Define Variable Beat to Beat Threshold , Irregular Threshold and
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
before the HR Rhythm is classified as “Variable”.
•
Irregular Threshold : Max number of irregular beats before
the HR Rhythm is classified as “Irregular”.
•
Highly Irregular Threshold : Max number of irregular beats
before the HR Rhythm is classified as “Highly Irregular”.
4 Scan Settings area Define scan parameters for Cardiac scans.
See Cardiac Scan Parameters .
5 [Save] Saves parameter changes.
6 [Exit] Closes the window.
Scan Settings
The title bar of the Scan Settings area is updated with the exact boundaries selected in the
Average Heart Rate (BPM) / Heart Rate Rhythm category table.
Table 2: Cardiac Axial Parameters
Name
Description
Slowest Allowable Rotation Speed Slowest gantry speed that would be suggested if prescribed Noise Index cannot be
achieved by SmartmA.
Acquisition Part 1
Acquisition Part 2
Acquisition Part 3
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.
Widen for SSF
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.
HR Variation Type
HR Variation Amount
Inputs to calculate HR Variation Amount in BPM.
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
Absolute Value is selected.
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.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
358 5 Auto Gating