ICS 11.040.50                          MHD 15

Reaffirmed 2022

NATIONAL FOREWORD

This Indian Standard (Part 1-2) which is identical with 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’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of Electromedical, Diagnostic Imaging and Radiotherapy Equipment Sectional Committee and approval of the Medical Equipment and Hospital Planning Division Council.

Other parts in this series are:

Part 1-2 Determination of the detective quantum efficiency - Detectors used in radiographic imaging

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

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 procedure employed.

There is a growing consensus in the scientific world that the Detective Quantum Efficiency (DQE) is the most suitable parameter for describing the imaging performance of an X-ray imaging device. The DQE describes the ability of the imaging device to preserve the signal to noise ratio from the radiation field from the radiation field to the resulting digital image data. Since in X-ray imaging, the noise in the radiation field is intimately coupled to the exposure level, DQE value can also be considered to describe the dose efficiency of a given imaging device.

This standard has been developed in order to specify the measurement procedure together with the format of the conformance statement for the Detective Quantum Efficiency of digital X-ray imaging devices.

In the DQE calculations proposed in this standard, it is assumed that system response is measured for objects that attenuate all energies equally.

This standard shallbe beneficial for manufacturers, users, distributors and regulatory agencies. It can be regarded as the first of a series describing all the relevant parameters of digital X-ray imaging devices.

Only the English language text of IEC Standard has been retained while adopting it in this standard and as such the page numbers given here are not the same as in the IEC Standard.

The text of IEC Standard has been approved as suitable for publication as an Indian Standardwithout deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as the decimal marker while in Indian Standards, the current practice is to use a point (.) as a decimal marker.