systems are often used. For detailed information on detector selection and
performance evaluation, see [12–16].
12.4 Limitations in Fluorescence
Imaging
Most modern microscopy equipment is constructed to minimize phase distor-
tion and optical aberrations. Nevertheless, no optical system is completely free
of distortion, and, in practice, aberrations are always present to some extent.
For a detailed description of the sources of aberrations in fluorescence micro-
scopy, see [17]. The sources of aberrations in fluorescence microscopy broadly
fall into two categories; instrumentation based and sample based. In addition,
sample preparation and microscope handling also constitute important and
frequent sources of inhomogeneity observed in fluorescence images. ...