%0 Journal Article %A Charles E. Metz %A Ming W. Tsui %A Robert N. Beck %T Theoretical Prediction of the Geometric Transfer Function for Focused Collimators %D 1974 %J Journal of Nuclear Medicine %P 1078-1083 %V 15 %N 12 %U https://jnm.snmjournals.org/content/jnumed/15/12/1078.full.pdf