IEC 62220-1-2:2007

Medical electrical equipment - Characteristics of digital X-ray imaging devices - Part 1-2: Determination of the detective quantum efficiency - Detectors used in mammography

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 1-2 is restricted to digital X-ray imaging devices that are used for mammographic imaging such as but not exclusively, CR systems, direct and indirect flat panel detector based systems, scanning systems (CCD based or photon-counting). This part of IEC 62220 is not applicable to - digital X-ray imaging devices intended to be used in general radiography or in dental radiography; - computed tomography; and - devices for dynamic imaging (where series of images are acquired, as in fluoroscopic or cardiac imaging).

Appareils électromédicaux - Caractéristiques des dispositifs d'imagerie numérique à rayonnement X - Partie 1-2: Détermination de l'efficacité quantique de détection - Détecteurs utilisés en mammographie

Spécifie la méthode de la détermination de l'efficacite quantique de détection (EQD) des dispositifs d'imagerie numérique à rayons 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. Cette Partie 1-2 est limitée aux dispositifs d'imagerie numérique à rayonnement X utilisés dans l'imagerie mammaire, tels que, mais pas exclusivement, les systèmes à écrans photo stimulables (connus sous la désignation de "Computer Tomography", CR), les systèmes à base de détecteur à panneau plat direct ou indirect, les systèmes de balayage (à base de dispositif à transfert de charge (CCD en anglais) ou à comptage de photons). La présente partie de la CEI 62220 n'est pas applicable: - aux dispositifs d'imagerie numérique à rayonnement X destinés à être utilisés en radiographie générale ou en radiographie dentaire; - à la tomodensitométrie; et - aux dispositifs d'imagerie dynamique (où des ensembles d'images sont acquis, comme dans l'imagerie radioscopique ou cardiaque).

General Information

• Status: Published
• Publication Date: 04-Jun-2007
• 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: 15-Aug-2007
• Completion Date: 05-Jun-2007

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
CEI
62220-1-2
NORME
First edition
INTERNATIONALE
Première édition
2007-06
Medical electrical equipment –
Characteristics of digital X-ray imaging devices –
Part 1-2:
Determination of the
detective quantum efficiency –
Detectors used in mammography
Appareils électromédicaux –
Caractéristiques des dispositifs
d’imagerie numérique à rayonnement X –
Partie 1-2:
Détermination de l’efficacité
quantique de détection –
Détecteurs utilisés en mammographie
Reference number
Numéro de référence
IEC/CEI 62220-1-2:2007
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INTERNATIONAL IEC
STANDARD
CEI
62220-1-2
NORME
First edition
INTERNATIONALE
Première édition
2007-06
Medical electrical equipment –
Characteristics of digital X-ray imaging devices –
Part 1-2:
Determination of the
detective quantum efficiency –
Detectors used in mammography
Appareils électromédicaux –
Caractéristiques des dispositifs
d’imagerie numérique à rayonnement X –
Partie 1-2:
Détermination de l’efficacité
quantique de détection –
Détecteurs utilisés en mammographie
PRICE CODE
U
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 62220-1-2 © IEC:2007
CONTENTS
FOREWORD.3
INTRODUCTION.5

1 Scope.6
2 Normative references .6
3 Terminology and definitions .7
4 Requirements .9
4.1 Operating conditions .9
4.2 X-RAY EQUIPMENT .9
4.3 RADIATION QUALITY .9
4.4 TEST DEVICE .10
4.5 Geometry .11
4.6 IRRADIATION conditions.12
5 Corrections of RAW DATA .15
6 Determination of the DETECTIVE QUANTUM EFFICIENCY.16
6.1 Definition and formula of DQE(u,v) .16
6.2 Parameters to be used for evaluation .16
6.3 Determination of different parameters from the images.17
7 Format of conformance statement .21
8 Accuracy .21

Annex A (normative) Determination of LAG EFFECTS.22
Annex B (informative) Calculation of the input NOISE POWER SPECTRUM.25

Bibliography.26

Terminology – Index of defined terms .28

62220-1-2 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEDICAL ELECTRICAL EQUIPMENT –
CHARACTERISTICS OF DIGITAL X-RAY IMAGING DEVICES –

Part 1-2: Determination of the detective quantum efficiency –
Detectors used in mammography
FOREWORD
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International Standard IEC 62220-1-2 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/649/FDIS 62B/656/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 62220-1-2 © IEC:2007
A list of all parts of the IEC 62220 series, published under the general title Medical electrical
equipment – Characteristics of digital X-ray imaging devices, can be found on the IEC
website.
In this standard, terms printed in SMALL CAPITALS are used as defined in IEC 60788, in Clause
3 of this standard or other IEC publications referenced in the Index of defined terms. Where a
defined term is used as a qualifier in another defined or undefined term it is not printed in
SMALL CAPITALS, unless the concept thus qualified is defined or recognized as a “derived term
without definition”.
NOTE Attention is drawn to the fact that, in cases where the concept addressed is not strongly confined to the
definition given in one of the publications listed above, a corresponding term is printed in lower-case letters.
In this standard, certain terms that are not printed in SMALL CAPITALS have particular
meanings, as follows:
– "shall" indicates a requirement that is mandatory for compliance;
– "should" indicates a strong recommendation that is not mandatory for compliance;
– "may" indicates a permitted manner of complying with a requirement or of avoiding the
need to comply;
– "specific" is used to indicate definitive information stated in this standard or referenced in
other standards, usually concerning particular operating conditions, test arrangements or
values connected with compliance;
– "specified" is used to indicate definitive information stated by the manufacturer in
accompanying documents or in other documentation relating to the equipment under
consideration, usually concerning its intended purposes, or the parameters or conditions
associated with its use or with testing to determine compliance.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the
data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
62220-1-2 © IEC:2007 – 5 –
INTRODUCTION
DIGITAL X-RAY IMAGING DEVICES are increasingly used in medical diagnosis and will widely
replace conventional (analogue) imaging devices such as screen-film systems or analogue X-
RAY IMAGE INTENSIFIER television systems in the future. It is necessary, therefore, to define
parameters that describe the specific imaging properties of these DIGITAL X-RAY IMAGING
DEVICES and to standardize the measurement procedures employed.
There is growing consensus in the scientific world that the DETECTIVE QUANTUM EFFICIENCY
(DQE) is the most suitable parameter for describing the imaging
...