Publication detail
A method for objective quantification of the efficiency of electron detectors.
FRANK, L. MÜLLEROVÁ, I. NOVÁK, L. HORÁČEK, M. KONVALINA, I.
Czech title
Metoda pro objektivní kvantifikaci účinnosti detektorů elektronů.
English title
A method for objective quantification of the efficiency of electron detectors.
Type
conference paper
Language
en
Original abstract
The Detection Quantum Efficiency (DQE) used to be measured via squared ratio of signal-to-noise ratios (SNR) at input and output of the detector or its part under question. This approach is based on defining SNR as the ratio of rms noise to the actual image signal. In terms of the random variable calculus, it is the ratio of standard deviation s (X) to the mean value E (X) of the pixel signal X taken from scenery with no true image contrast. Assuming X governed by Poisson statistics, we get s (X) = [E(X)]1/2 so that SNR(X) = [E(X)]1/2 as well and the ratio of squared SNRs simply expresses the loss of events in the detection process. This study aims at verifying this simple algorithm for digitized images, and at its application to objective quantification of DQE and contributions to it.
English abstract
The Detection Quantum Efficiency (DQE) used to be measured via squared ratio of signal-to-noise ratios (SNR) at input and output of the detector or its part under question. This approach is based on defining SNR as the ratio of rms noise to the actual image signal. In terms of the random variable calculus, it is the ratio of standard deviation s (X) to the mean value E (X) of the pixel signal X taken from scenery with no true image contrast. Assuming X governed by Poisson statistics, we get s (X) = [E(X)]1/2 so that SNR(X) = [E(X)]1/2 as well and the ratio of squared SNRs simply expresses the loss of events in the detection process. This study aims at verifying this simple algorithm for digitized images, and at its application to objective quantification of DQE and contributions to it.
Keywords in English
detection quantum efficiency, electron detectors, collection efficiency
Released
22.08.2004
Location
Antwerpy
Book
In EMC 2004 - Proceedings of the 13th European Microscopy Congress
Pages count
2
BIBTEX
@inproceedings{BUT21738,
author="Luděk {Frank} and Ilona {Müllerová} and Libor {Novák} and Miroslav {Horáček} and Ivo {Konvalina},
title="A method for objective quantification of the efficiency of electron detectors.",
booktitle="In EMC 2004 - Proceedings of the 13th European Microscopy Congress",
year="2004",
month="August",
address="Antwerpy"
}