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PC and ERT Control/Gating Module
R-DETECT SETUP window
Click the ECG button in the GATING SETUP window or right click in the ECG waveform
display to view the R-DETECT SETUP window.
The high pass filter removes low frequency components of the ECG waveform. It can
be useful with large animals and low heart rates, but is of little benefit for mice. The
order number can be selected between 16 and 6.
Order number 6 produces the
strongest filter function. Use the high pass filter with low order numbers for large
animals to reduce low frequency "T-wave" flow artifacts.
The R-detect blanking period or blanking time is a very useful feature. Once an R-
wave has been detected, the software inhibits R-wave gate generation for the blanking
time. This feature can be used to eliminate false triggers from gradient vibrations. In
that case, the blanking time should be set to exceed the MR scanner acquisition time by
about 10 msec.
Revision C, August 2013
3-9
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