Linear zone plates (LZP) have been constructed using optical methods both in amplitude and in phase. The results obtained confirm that focal distances follow the relation f/n, and the focal number and its diffraction efficiencies increase by transforming a LZP from amplitude to phase.
No takes yet. Share an insight, caveat, or question.
Gómez-Reino et al. (1979) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: