EN 61262-5-1994 en Medical Electrical Equipment - Characteristics of Electro-Optical X-Ray Image Intensifiers Part 5 Determination of the Detective Quantum Efficiency《医用电气设备 光电X射线影.pdf
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1、CENELEC ENabLZb2-5 54 3404583 0350594 4T7 M BRITISH STANDARD Characteristics of electro-optical X-ray image intensifiers for medical electrical equipment Part 5. Determination of the detective quantum efficiency The European Standard EN 61262-5 : 1994 has the status of a British Standard BS EN 61262
2、-5 : 1995 IEC 1262-5 : 1994 CENELEC EN*h1262-5 94 = 3404583 0350595 333 BS EN 61262-5 : 1995 Amd. No. Committees responsible for this British Standard Date Text affected The preparation of this British Standard was entrusted to Rchnical Committee HCC/72, Image intensifiers, upon which the following
3、bodies were represented: Association of X-ray Equipment Manufacturers (BEAMA Ltd.) British Institute of Radiology College of Radiographers Institute of Physical Sciences in Medicine (Ipsm) This British Standard, having been prepared under the direction of the Health and Environment Sector Board (W-)
4、, was published under the authority of the Standards Board and comes into effect on 15 April 1995 O BSI 1995 The following BSI references relate to the work on this standard: Committee reference HCC/72 Draft for comment 94/501345 DC ISBN O 580 24035 5 Amendments issued since publication CENELEC EN*h
5、L2612-5 94 = 3404583 0350596 27T BS EN 61262-5 : 1995 Contents Committees responsible National foreword Page Inside front cover ii Foreword 2 Ext of EN 61262-5 4 i CENELEC ENabLZb2-5 94 W 3404583 0350597 106 BS EN 61262-5 : 1995 National foreword This British Standard has been prepared by Technical
6、Committee HCC/72 and is the English language version of EN 61262-5 : 1994 Medical electrical equipment - Characteristics of electro-optical X-ray image intenstyiers - Part 5 Determination of the detective quantum efficiency, published by the European Committee for Electrotechnical Standardization (C
7、ENELEC). It is identical with IEC 1262-5 : 1994 published by the International Electrotechnical Commission (IEC). Cross-references Publication referred to HD 501 S1 (IEC 788 : 1984) Additional information. The following print types are used in this standard. Requirements, with which compliance can b
8、e tested, and definitions: in roman type. Explanations, advice, general statements, exceptions and references: in smaller type. lst procedures: in italic type Terms defined in clause 3 of this standard and in annex A: in SMALL CAPITALS. For the purposes of this British Standard, any references to IE
9、C page numbers in the text should be ignored. Compliance with a British Standard does not of itself confer immunity from legal obligations. Corresponding British Standard BS 6641 1 1985 Glossary of medical radiology terms ii CENELEC EN*b12b2-5 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM 94 = 3
10、404.583 0150598 O42 H EN 61262-5 September 1994 ICs 11.040.50 Descriptors: Medical electrical equipment, image intensifier, X-ray, detection English version Medical electrical equipment - Characteristics of electro-optical X-ray image intensifiers Part 5: Determination of the detective quantum effic
11、iency (IEC 1262-5 : 1994) Appareils lectromdicaux - Caractristiques des intensificateurs electro-optiques dimage radiologique Rntgenbildverstrkern Partie 5: Dtermination de lefficacit quantique de dtection Quanten- Ausbeute Medizinische elektrische Gerte - Merkmale von elektronenoptischen Teil 5: Be
12、stimmung der detektiven (CE1 1262-5 : 1994) (IEC 1262-5 1994) This European Standard was approved by CENELEC on 1994-07-05. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard
13、without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other la
14、nguage made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Gre
15、ece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat
16、: rue de Stassart 35, B-1050 Brussels O 1994 Copyright reserved to CENELEC members Ref. No. EN 61262-5 : 1994 E CENELEC ENxb3262-5 94 3404583 0350599 T89 Page 2 EN 61262-5 : 1994 Foreword The text of document 62B(C0)116, as prepared by Sub-committee 62B: Diagnostic imaging equipment, of IEC Technica
17、l Committee 62: Electrical equipment in medical practice, was submitted to the IEC-CENELEC parallel vote in January 1994. The reference document was approved by CENELEC as EN 61262-5 on 5 July 1994. The following dates were fixed: - latest date of publication of an identical national standard (dop)
18、1995-07-01 - latest date of withdrawal of conflicting national standards (dow) 1995-07-01 For products which have complied with the relevant national standard before 1995-07-01, as shown by the manufacturer or by a certification body, this previous standard may continue to apply for production until
19、 2000-07-01. Annexes designated normative are part of the body of the standard. Annexes designated informative are given only for information. In this standard, annexes A, B, C and D, are informative and annex ZA is normative. CENELEC ENa61262-5 74 m 3404583 0150600 520 Page 3 EN 61262-5 : 1994 CONT
20、ENTS FOREWORD 2 INTRODUCTION 4 clause 1 scope 5 2 Normative reference 5 3 Terminology 5 3.1 Definitions . 5 3.2 Degree of requirements and reading instructions 6 4 Requirements . 7 4.1 test set-up 7 4.2 X-RAY IMAGE INTENSIFIER . Operating conditions . 7 4.3 Input radiation 7 4.4 TESTDEVICE 8 4.5 Mea
21、surement equipment 8 5 Determination of the DETECTIVE QUANTM EFFICIENCY . 10 5.1 Preparation 10 5.2 Measurement II 5.3 Corrections 12 5.4 Determination 12 6 Presentation Of the DETECTIVE QUAMUM EFFICIENCY 13 7 Statement of compliance . 13 Figure 1 . Geometrical relationship Of RADIATION SOURCE and I
22、NPUT APERTURE . 14 Annexes A Terminology . Index of terms 15 B Representative test Set-up . 16 C Representative scintillation pulse-height spectra 17 D Bibliography . 18 ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications
23、. 19 CENELEC EN*bL2b2-5 74 = 3404583 OL5ObOL 467 Page 4 EN 61262-5 : 1994 INTRODUCTION DETECTIVE QUANTUM EFFICIENCY (DQE) is a measure of the imaging quality Of a System based On a comparison of the signal-to-noise ratio (SNR) at its output to the SNR at its input. For linear imaging systems, SNR an
24、d DQE can be conveniently analysed in terms of sinusoidally varying signals. This standard gives detailed specifications for the determination of the DOE of ELECTRO-OPTICAL X-RAY IMAGE INTENSIFIERS near zero frequency for both spatial and temporal frequencies. The method employed is scintillation sp
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