🔥🔥 Don’t Miss Out on Our End of Autumn Sale. If you have any questions, feel free to click the bottom right corner to contact our customer service..

Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
BS EN 62220-1-1:2015

BS EN 62220-1-1:2015

$167.15

Medical electrical equipment. Characteristics of digital x-ray imaging devices – Determination of the detective quantum efficiency. Detectors used in radiographic imaging

Published By Publication Date Number of Pages
BSI 2015 44
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Categories: ,

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

IEC 62220-1-1:2015 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 first edition of IEC 62220-1-1 cancels and replaces IEC 62220-1:2003. It constitutes a technical revision of IEC 62220-1:2003 and assures a better alignment with the other parts of the IEC 62220 series. The main changes are as follows: – necessary modifications have been applied as a consequence of taking into account IEC 61267:2005. This influences HVL values and SNRin2; – the method for the determination of LAG EFFECTS now considers lag and ghosting compensation; – as part of the MTF determination, the method of obtaining the final averaged MTF has been restricted (only averaging of the ESF is allowed); – a description of (optionally) obtaining the diagonal (45°) MTF and NPS has been added.

PDF Catalog

PDF Pages PDF Title
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
13 3 Terms and definitions
15 4 Requirements
4.1 Operating conditions
4.2 X-RAY EQUIPMENT
4.3 RADIATION QUALITY
16 4.4 TEST DEVICE
Tables
Table 1 – Radiation quality (IEC 61267:2005) for the determination of detective quantum efficiency and corresponding parameters
17 4.5 Geometry
Figures
Figure 1 – Test device for the determination of the modulation transfer function and the magnitude of lag effects
19 4.6 Irradiation conditions
4.6.1 General conditions
Figure 2 – Geometry for exposing the digital X-ray imaging device behind the test device in order to determine lag effects and the modulation transfer function
20 4.6.2 air kerma measurement
21 4.6.3 Avoidance of lag effects
4.6.4 Irradiation to obtain the conversion function
4.6.5 Irradiation for determination of the noise power spectrum
22 4.6.6 Irradiation for determination of the modulation transfer function
Figure 3 – Position of the test device for the determination of the modulation transfer function
23 4.6.7 Overview of all necessary irradiations
5 Corrections of raw data
Table 2 – Necessary irradiations
24 6 Determination of the detective quantum efficiency
6.1 Definition and formula of DQE(u,v)
6.2 Parameters to be used for evaluation
25 6.3 Determination of different parameters from the images
6.3.1 Linearization of data
6.3.2 The noise power spectrum (NPS)
Table 3 – Parameters mandatory for the application of this standard
26 Figure 4 – Geometric arrangement of the ROIs for NPS calculation
27 6.3.3 Determination of the modulation transfer function (MTF)
28 Figure 5 – Representation of the image acquired for the determination of the MTF
29 7 Format of conformance statement
30 8 Accuracy
31 Annex A (normative)Determination of lag effects
A.1 Overview
A.2 Estimation of lag effects (default method)
A.3 Estimation of lag effects, alternative method (only if no lag effect or ghosting compensation is applied)
A.3.1 General
32 A.3.2 Test of additive lag effects
33 Figure A.1 – Definition of the ROIs for the test of additive lag effects
Figure A.2 – Procedure flow diagram for the test of additive lag effects
34 A.3.3 Test of multiplicative lag effects
35 Figure A.3 – Definition of the ROIs for the test of the multiplicative lag effects
Figure A.4 – Procedure flow diagram for the test of multiplicative lag effects
36 A.3.4 Determination of the minimum time between consecutive images
37 Annex B (informative) Calculation of the input noise power spectrum
38 Bibliography
41 Index of defined terms used in this particular standard

Related products

BS EN 62220-1-1:2015
$167.15