NIRStar 14.1 - User Manual
Page 29 of 124
Parallel Illumination
For a given number of sources, the number of steps may be reduced, and the scan rate increased, by
turning on more than one source per step (i.e., highlight more than one dot per row). Figure 13 shows
the case of a scan sequence in which two LEDs are switched on at the same time, i.e., 1 & 9, 2 & 10, 3 &
11, etc.
When employing parallel illumination, care should be taken to avoid optical cross-
talk. Therefore, sources activated during the same step should be located so that no
detector receives light from both sources simultaneously.
To avoid optical cross talk, a sufficient distance (a minimum of ~6 cm) should be maintained between the
paired sources. This is easiest to achieve by performing a parallel scan of well-separated brain areas (e.g.,
left and right hemisphere).
Figure 13. Illumination Setup: An example for a bilateral setup for 16 sources
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