Table 2.

Performance ranges for point-spread functions of sparse and dense fNIRS arrays (minimum to maximum).

Array	FWHM (mm)	Localization error (mm)	Effective resolution (mm)
Square sparse	14.6–42.0	0.4–10.7	16.5–44.2
Triangular sparse	16.5–48.2	0.0–13.5	16.5–48.2
High density	8.2–17.2	0.0–5.8	8.9–25.3