Evoke
®
SCS System Clinical Manual
CLIN-UMAN-005175
Revision: 9.00
Page 26 of 101
6.
Touch
Apply
to set the optimal Processing Offset
. The open
circle on the plot is the recommended offset (peak of plot), while the black line is the
offset setting in use.
7.
Touch Apply to set the optimal Filter Frequency
. The open
circle on the plot is the recommended frequency (peak of plot), while the black line is
the frequency setting in use.
8.
Ensure the applied measurement settings match the recommended measurement
settings (Figure 6.16), and check that the peaks of the ECAP signal line up with the peaks
of the correlation filter. If they don’t, you may manually adjust Processing Offset and
Filter Frequency until they do (see Section 8.2).
Note:
The default filter has a negative first peak (see Figure 6.16). In some cases filter
alignment may be improved by flipping the filter the first peak is positive. This is done by
changing the measurement setup to ‘ECAP calculated using filter (+)’ from the
Measurement Setup options (see Section 8.2). See Section 6.10.1 for other ECAP
measurement options.
Figure 6.16: ECAP display with a well matched filter (-).
9.
The ECAP amplitude and current rolling plot (Figure 6.14A) displays the ECAP amplitude
(top) and current (bottom) over time. You can use the
and
buttons to adjust
the minimum ECAP measurement value displayed. ECAP amplitudes below the ECAP
Minimum (dotted black line, see Sections 6.10.1 and 8.6) are shaded in red (Figure 6.17).
Measurement settings
in use
Peak of filter aligned
with corresponding
peak of ECAP
(red dashed lines)
Average ECAP
estimate (black)
Recommended
measurement settings
Correlation filter used
to measure (white)
