Abstract
Publisher Summary This chapter discusses about the image tubes and detective quantum efficiency (DQE). DQE is normally used as a single valued estimate of a photosensor's performance evaluated at zero frequency. DQE can be expressed as a function of the modulation transfer function (MTF) of a device, quantum efficiency of its photosensor, and of a degradation factor which exists when performance is reduced by noise other than photoelectron noise. The dependence on MTF is important because it permits expression of spatial frequency dependence in an absolute manner, simplifies obtaining a measure of performance of the system, and avoids difficulties which arise when working solely with the MTF. DQE is clearly revealed to give the effective efficiency of a device, when operating in a noisy condition. At high signal levels, DQE improves to a value equal to the photosensor's quantum efficiency. DQE can be expressed as a function dependent on spatial frequency. Effective efficiency of a device can be expressed as a function of spatial frequency, and in effect provides an absolute measure of MTF. This chapter elaborates relationship between DQE and the MTF. Concepts of the effective spatial frequency bandwidth are explained. A discussion on passive optics is also presented in this chapter.
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