BS EN IEC 61676:2023:2024 Edition
$167.15
Medical electrical equipment. Dosimetric instruments used for non-invasive measurement of x-ray tube voltage in diagnostic radiology
| Published By | Publication Date | Number of Pages |
| BSI | 2024 | 40 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications |
| 7 | English CONTENTS |
| 9 | FOREWORD |
| 11 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references |
| 13 | 3 Terms and definitions |
| 16 | 4 General performance requirements for measurement of practical peak voltage measurements 4.1 Quantity to be measured 4.2 Limits of performance characteristics 4.2.1 Limits 4.2.2 Maximum error Tables Table 1 – Minimum effective ranges |
| 17 | 4.2.3 Over and under range indications |
| 18 | 4.2.4 Repeatability 4.2.5 Long term stability 4.3 Limits of variation for effects of influence quantities 4.3.1 Influence quantities 4.3.2 Minimum rated range of use |
| 19 | 4.3.3 Reference conditions 4.3.4 Standard test conditions 4.3.5 Limits of variation Table 2 – Minimum rated range of use, reference conditions, standardtest conditions, limits of variation (± L) and intrinsic error (E) overthe effective range of use, for the pertaining influence quantity |
| 20 | 4.4 Performance test procedures 4.4.1 General remarks |
| 21 | 4.4.2 Dependence of instrument response on voltage waveform and frequency Table 3 – Minimum test points and test values ofpractical peak voltage for influence quantities |
| 22 | 4.4.3 Dependence of instrument response on anode angle 4.4.4 Dependence of instrument response on filtration 4.4.5 Dependence of instrument response on dose rate |
| 23 | 4.4.6 Dependence of instrument response on irradiation time 4.4.7 Dependence of instrument response on field size 4.4.8 Dependence of instrument response on focus-to-detector distance |
| 24 | 4.4.9 Dependence of instrument response on angle of incidence of radiation 4.4.10 Dependence of instrument response on angle of detector rotation with respect to the X-ray tube axis 4.4.11 Dependence of instrument response on temperature and humidity |
| 25 | 4.4.12 Dependence of instrument response on operating voltage |
| 26 | 4.4.13 Dependence of instrument response on electromagnetic compatibility |
| 27 | 4.4.14 Additional tungsten filtration (tube aging) |
| 28 | 5 Special instrumental requirements and marking 5.1 Requirements for the complete instruments 5.2 General 5.3 Display 5.4 Range of measurement 5.5 Connectors and cables Table 4 – Maximum half-value layer (hvl) depending on anode angle |
| 29 | 6 Accompanying documents 6.1 General 6.2 Information provided 6.3 Instrument description 6.4 Detector 6.5 Delay time 6.6 Measurement window 6.7 Data outlet 6.8 Transport and storage |
| 30 | Annex A (informative) Combined standard uncertainty Table A.1 – Example for assessment of the combined standard uncertainty – Instruments used for non-invasive measurement of X-ray tube voltage |
| 31 | Annex B (informative) Additional information on practical peak voltage B.1 Overview B.2 Simplified formalism for the determination of the practical peak voltage Û |
| 33 | Figures Figure B.1 – Example of a waveform of a two-pulse generator Figure B.2 – Example of a waveform of a constant-voltage generator |
| 34 | Figure B.3 – Example of falling load waveform Table B.1 – Values of 20 samples of the falling load waveform in Figure B.3 |
| 35 | Table B.2 – Voltage bins, probability and weighting factors forthe 20 samples of the falling load waveform in Figure B.3 |
| 36 | Table B.3 – Weighting factors for the 20 equally spaced samplesof the falling load waveform in Figure B.3 |
| 37 | Bibliography |
| 38 | Index of defined terms |
