... resolution is by looking at the frequency response This goes against the fundamental Chapter 25- Special Imaging Techniques 425 philosophy of this book; however, it is a common method and you need to become ... function (LSF) and the edge response As shown in Fig 25-3, the line spread Chapter 25- Special Imaging Techniques a Line Spread Function (LSF) 427 b Edge Response 90% 50% 10% Full Width at Half ... directions, while the LSF is limited to only one specific direction A system Chapter 25- Special Imaging Techniques FIGURE 25-5 Relationship between the PSF and LSF A pillbox PSF is shown in (a)...