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Advanced Features
ADVANCED GATING SETUP window
The advanced gating menu includes the following additional features:
1. End Delay for the gate generated by each signal except ECG
2. Primary, begin, hold and end conditions for each signal gate included in the
construction of the output gate
3. Gate count condition logic
End delay allows the gate to be delayed from its otherwise normal end position.
Primary, begin, hold and end are logical conditions applied to the gates generated for
each signal which are included in generation of the output gate.
When using the complex gating control, separate criteria are used for beginning and
ending the output gate signal. The beginning of the output gate occurs when all the gate
signals checked under Begin are logic high. If a Primary gate is selected, the beginning
of the output gate occurs when all the Begin gates are high AND there is a low to high
transition of the Primary gate. The end of the output gate occurs when ANY of the Hold
gates (gates checked under Hold) goes low, OR when ALL of the End gates go low.
The possibilities for using this gating control are limited only by imagination when one
considers the flexibility provided by two external gate inputs and two user definable
analog inputs. However, typically, only a few items would be checked, and the end
condition would be defined by either Hold or End, but not both (a column with no checks
has no effect).
The gate counting feature allows a preset number of gates based on the above criteria
to be output, followed by a blockage of outputs until the Gate Count reset condition is
met. As an example, it could be set up to reset on expiration and use only the first ECG
gate for imaging
Auto Track
The auto track feature provides an automatic way to adjust the respiration gate when
the animal's respiration changes. The feature can be applied to E-Resp
USER RESP. This feature is especially useful during long experiments when variations
in either the animal's sedation or temperature cause respiration to change.
In the GATING SETUP window click a respiration button to display the AUTO TRACK
window. Make certain the waveform of interest is selected as E-Resp
RESP.
Either or both of the parameters Begin Delay and Max Width can be
automatically tracked. Enter the desired percentage of the measured respiration rate
for one or both parameters and check the Enabled box
15-6
Revision C, August 2013
TM
, Resp or
TM
, Resp or USER
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