title: Interpretation of the optical transfer function: Significance for image scanning microscopy.
abstract: The optical transfer function (OTF) is widely used to compare the performance of different optical systems. Conventionally, the OTF is normalized to unity for zero spatial frequency, but in some cases it is better to consider the unnormalized OTF, which gives the absolute value of the image signal. Examples are in confocal microscopy and image scanning microscopy, where the signal level increases with pinhole or array size. Comparison of the respective unnormalized OTFs gives useful insight into their relative performance. The significance of other properties of the general OTF is discussed.
authors.forename: Colin J R
authors.initials: CJ
authors.lastname: Sheppard
authors.forename: Stephan
authors.initials: S
authors.lastname: Roth
authors.forename: Rainer
authors.initials: R
authors.lastname: Heintzmann
authors.forename: Marco
authors.initials: M
authors.lastname: Castello
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Vicidomini
authors.forename: Rui
authors.initials: R
authors.lastname: Chen
authors.forename: Xudong
authors.initials: X
authors.lastname: Chen
authors.forename: Alberto
authors.initials: A
authors.lastname: Diaspro