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Fig. 1A —Principle of full width at half maximum (FWHM) of response of very
small object for describing spatial resolution that can be achieved.
Visualization of two ideal points separated by distance of less than one FWHM
(A) and separated more than one FWHM (B). Response of ideal
point is represented by gray area; composite response of two ideal points is
represented by curving black line. At separation distance of less than one
FWHM, two points cannot be distinguished separately; at distance of more than
one FWHM, two points can be observed individually. Note that this criterion
assumes static condition, or, in other words, that no motion artifacts are
present.
