Programming Instructions
70
RNS
®
System User Manual
Recommended Modifications to Detection Settings
After initial ECoGs have been stored, the physician should review the stored ECoGs and identify the
specific electrocorticographic patterns to be detected. Based on the type of pattern to be detected,
the physician can program the neurostimulator to use 1 of 3 programmable detection tools
(detectors). Three detector types are available; these are the line length, area, and bandpass. The
detector type should be selected based on the type of pattern to be detected. These recommended
modifications apply whether using the PDMS or the NeuroPace® Programmer to configure detection.
Line length detector
The line length detector provides detection of power (a type of ECoG activity). To understand how the
line length detector works, imagine the ECoG as a string that can be stretched so the length can be
measured (see Figure 29). ECoGs with higher amplitude or frequency oscillations will have longer
length. The line length detector operates by comparing the normalized ECoG length (length per
second) in a short-term trend window (typically 1 to 4 seconds) to the normalized ECoG length in a
long-term trend window (typically 1 to 2 minutes). When the difference between the short-term and
long-term trend windows exceeds a programmed threshold (typically 37.5% to 100%) detection
occurs.
Figure 29: Line length detector example.
