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index (Bronnikov 2002). When applied to isolated, small partly
absorbing specimens, either embedded in a capillary tube or
glued onto it (Figure 24.17a and b), limitations due to the weak
phase object approximation are evident (Dragomir et al. 2008a).
24.3.2.1.4 Optical Diraction RI Tomography
e theoretical basis of optical diraction tomography (ODT)
was developed in the early 1970s (Wolf 1969, Dändliker and
Weiss 1970). ODT records the complex wavefront diracted by
a transparent or semitransparent object under varying illumina-
tion angles (Lauer 2002). e Born approximation framework is
adopted