| Popis: |
The quality of a tomogram is mainly determined by the fact whether and to what extent the details outside the sharply delineated tomographic area are visible as blurred shadows. The blurring effects with various tomography apparatus with multidimensional blurring were examined experimentally in two series of experiments: by means of a modulation transfer function on the one hand, and blurred images of a prepared skull of a corpse on the other. Both methods of examination showed that the blurring effect is much better with the complicated, multidimensional tomography movements (hypocycloids and spiral) than with the simple multidimensional ones (circle and ellipse). The differences between hypocycloidal and spiral blurring found experimentally by means of the modulation transfer functions, however, are just barely identifiable in the skull tomogram. |
