Physics and Radiobiology of Nuclear Medicine

ent photon energies, flood sources of radiations of respective energies
should be used. The image of the bar phantom obtained is visually
inspected, and spatial resolution is estimated from the smallest strips or
spacings distinguishable on the image (Fig. 10.4). Obviously, this technique
is qualitative and does not give a quantitative measure of the spatial
resolution.

Evaluation of Spatial Resolution 123

Fig. 10.3. (A) Bar phantom. (B) Hine–Duley phantom. (Courtesy of Nuclear Asso-
ciates, Carle Place, NY.)

Fig. 10.4. Bar phantom images at different distances from a parallel-hole
collimator.