IEC 62220-1-3:2008

Medical electrical equipment - Characteristics of digital X-ray imaging devices - Part 1-3: Determination of the detective quantum efficiency - Detectors used in dynamic imaging

IEC 62220-1-3:2008 specifies the method for the determination of the detective quantum efficiency (DQE) of digital X-ray imaging devices as a function of air kerma and of spatial frequency for the working conditions in the range of the medical application as specified by the manufacturer. The intended users of this part of IEC 62220 are manufacturers and well equipped test laboratories. This Part 1-3 is restricted to digital X-ray imaging devices that are used for dynamic imaging such as, but not exclusively, direct and indirect flat panel-detector based systems. It is not recommended to use this part of IEC 62220 for digital X-ray image intensifier-based systems.

Appareil électromédicaux - Caractéristiques des dispositifs d'imagerie numérique à rayonnement X - Partie 1-3: Détermination de l'efficacité quantique de détection - Détecteurs utilisés en imagerie dynamique

La CEI 62220-1-3:2008 spécifie la méthode de la détermination de l'efficacité quantique de détection (EQD) des dispositifs d'imagerie numérique à rayonnement X en fonction du kerma dans l'air et de la fréquence spatiale pour les conditions de fonctionnement dans la gamme des applications médicales, suivant les spécifications du fabricant. Les utilisateurs prévus de la présente partie de la CEI 62220 sont les fabricants et les laboratoires d'essai bien équipés.La présente partie 1-3 se limite aux dispositifs d'imagerie numérique à rayonnement X qui sont utilisés pour l'imagerie dynamique telle que, mais pas exclusivement, des systèmes à base de détecteurs plans direct ou indirect. Il n'est pas recommandé d'utiliser cette partie de la CEI 62220 pour des systèmes basés sur un intensificateur d'image radiologique.

General Information

• Status: Published
• Publication Date: 10-Jun-2008
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 11.040.50 - Radiographic equipment
• Technical Committee: SC 62B - Medical imaging equipment, software, and systems
• Drafting Committee: WG 33 - TC 62/SC 62B/WG 33
• Current Stage: PPUB - Publication issued
• Start Date: 30-Jun-2008
• Completion Date: 11-Jun-2008

Standards Content (Sample)

IEC 62220-1-3
Edition 1.0 2008-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Medical electrical equipment – Characteristics of digital X-ray imaging devices –
Part 1-3: Determination of the detective quantum efficiency – Detectors used in
dynamic imaging
Appareils électromédicaux – Caractéristiques des dispositifs d’imagerie
numérique à rayonnement X –
Partie 1-3: Détermination de l'efficacité quantique de détection – Détecteurs
utilisés en imagerie dynamique

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IEC 62220-1-3
Edition 1.0 2008-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Medical electrical equipment – Characteristics of digital X-ray imaging devices –
Part 1-3: Determination of the detective quantum efficiency – Detectors used in
dynamic imaging
Appareils électromédicaux – Caractéristiques des dispositifs d’imagerie
numérique à rayonnement X –
Partie 1-3: Détermination de l'efficacité quantique de détection – Détecteurs
utilisés en imagerie dynamique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 11.040.50 ISBN 2-8318-9826-9

– 2 – 62220-1-3 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .8
4 Requirements .10
4.1 Operating conditions .10
4.2 X-RAY EQUIPMENT .10
4.3 RADIATION QUALITY .10
4.4 TEST DEVICE.11
4.5 Geometry .12
4.6 IRRADIATION conditions .14
4.6.1 General conditions .14
4.6.2 AIR KERMA measurement .15
4.6.3 LAG EFFECTS.16
4.6.4 IRRADIATION to obtain the CONVERSION FUNCTION .16
4.6.5 IRRADIATION for determination of the NOISE POWER SPECTRUM and LAG
EFFECTS .16
4.6.6 IRRADIATION with TEST DEVICE in the RADIATION BEAM.17
4.6.7 Overview of all necessary IRRADIATIONS .18
5 Corrections of RAW DATA .18
6 Determination of the DETECTIVE QUANTUM EFFICIENCY .19
6.1 Definition and formula of DQE(u,v).19
6.2 Parameters to be used for evaluation .19
6.3 Determination of different parameters from the images.20
6.3.1 Linearization of data .20
6.3.2 The LAG EFFECTS corrected NOISE POWER SPECTRUM (NPS) .20
6.3.3 Determination of the MODULATION TRANSFER FUNCTION (MTF).24
7 Format of conformance statement .24
8 Accuracy .25
Annex A (informative) Determination of LAG EFFECTS.26
Annex B (informative) Calculation of the input NOISE POWER SPECTRUM .29
Bibliography.30
Index of defined terms .32

Figure 1 – TEST DEVICE .12
Figure 2 – Geometry for exposing the DIGITAL X-RAY IMAGING DEVICE in order to
determine the CONVERSION FUNCTION, the NOISE POWER SPECTRUM and the MODULATION
TRANSFER FUNCTION behind the TEST DEVICE.14
Figure 3 – Image acquisition sequence to determine the NOISE POWER SPECTRUM and
LAG EFFECTS.17
Figure 4 – Geometric arrangement of the ROIs .21
Figure A.1 – Power spectral density of white noise s and correlated signal g (only
positive frequencies are shown).27

62220-1-3 © IEC:2008 – 3 –
Table 1 – RADIATION QUALITY (IEC 61267:1994) for the determination of DETECTIVE
QUANTUM EFFICIENCY and corresponding parameters .11
Table 2 – Necessary IRRADIATIONS .18
Table 3 – Parameters mandatory for the application of this standard .20

– 4 – 62220-1-3 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEDICAL ELECTRICAL EQUIPMENT –
CHARACTERISTICS OF DIGITAL X-RAY IMAGING DEVICES –

Part 1-3: Determination of the detective quantum efficiency –
Detectors used in dynamic imaging

FOREWORD
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International Standard IEC 62220-1-3 has been prepared by subcommittee 62B: Diagnostic
imaging equipment, of IEC technical committee 62: Electrical equipment in medical practice.
The text of this standard is based on the following documents:
FDIS Report on voting
62B/694/FDIS 62B/702/RVD
Full information on the voting for th
...