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Application of DQE for quantitative assessment of detectors to estimate AEC efficiency in digital mammography

Fabiszewska Ewa, Wysocka-Rabin Anna, Dobrzyńska Magdalena, Skrzyński Witold, Pasicz Katarzyna

Polish Journal of Medical Physics and Engineering

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2021

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Vol. 27, Iss. 1

51--56

EN

Optimisation of the detector’s exposure parameters settings for image quality and patient dose is an important task in digital mammography. Assessment of a digital detector’s performance can be done objectively and without operator bias by determining the Detective Quantum Efficiency (DQE). The authors of this article aim to prove that the performance of the AEC system can be objectively portrayed through DQE. The results were examined for influence of KAD changes on DQE values and to determine if it was possible to obtain similar DQE values for different exposures. While analysing the effect of the operation of the AEC system described with DQE, the doses received by women during mammography examinations were considered, as well. The AEC system’s exposure control mechanism cannot guarantee the same DQE value for different object thicknesses. When the object thickness increases, the AEC system should increase the KAD value to obtain the same DQE value. The result of increasing KAD would be the increase of mean glandular dose for some women. However, assuming that DQE is a good indicator of image quality, introducing the proposed changes to the AEC system’s operation would result in the same image quality for all breast thicknesses. This approach to DQE use for AEC system evaluation is independent of the image processing procedure and can be the basis for changes to system calibration done by the manufacturer’s technical support team.

2

Bezpośrednia radiografia cyfrowa

Jezierski G.

Postępy Techniki Jądrowej

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2017

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z. 2

37--44

PL

Dynamiczny rozwój radiografii cyfrowej (bazującej na elektronice) jaki obserwujemy w ostatnich latach skutkuje także zastosowaniem tej techniki do badań nieniszczących w przemyśle (NDT). Jednakże biorąc pod uwagę istotne różnice, przede wszystkim znacznie wyższe energie promieniowania rentgenowskiego stosowane do badania różnych obiektów przemysłowych (np. złącza spawane, odlewy, połączenia w elektronice), jak również konieczność dysponowania niekiedy lekkimi, przenośnymi detektorami powoduje, że nie da się bezpośrednio przenieść rozwiązań z medycyny do przemysłu. W niniejszej publikacji przedstawiono współczesne trendy oraz praktyczne rozwiązania detektorów cyfrowych do zastosowań w NDT.

EN

Application of digital radiography (based on electronics) for imaging in medical practice has been recently dynamically developing, which results in implementation of this technique to industrial non-destructive testing (NDT). However, with respect to significant differences that include, first of all, much higher X-ray energies used for testing various object in industry (e.g. welds, castings, joints in electronic engineering) and often also necessity of using light, portable digital detectors, it is impossible to transfer solutions directly from medicine to industry. In this paper, modern trends and practical solutions of digital detectors designed for NDT are presented.

3

Detective quantum efficiency and modulation transfer function of radiographic luminescent sensors - comparison of analytical model and Monte Carlo simulation

Konarzewski B., Pawłowski Z., Domański G., Marzec J., Zaremba K.

Biocybernetics and Biomedical Engineering

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2003

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Vol. 23, no. 4

19-32

EN

DQE (detective quantum efficiency) and MTF (modulation transfer function) of a few radiographic luminescent sensors were calculated according to the simple analytical model (originally developed by Swank and reformulated by the authors). Next, these parameters were determined using the specialized Monte Carlo simulation program and compared with analytical results. The discrepancies were discussed, and constructive conclusions for more sophisticated analytical models were formulated.