AS/NZS 4274:1995

1 - AS/NZS 4274:1995 X-RAY TUBE ASSEMBLIES FOR MEDICAL DIAGNOSIS-CHARACTERISTICS OF FOCAL SPOTS
4 - PREFACE
5 - CONTENTS
7 - SECTION 1: GENERAL
7 - 1.1 Scope and object
7 - 1.2 Normative references
7 - 1.3 TermInology
7 - 1.3.1 Degree of requirements
8 - 1.3.2 Definitions
8 - SECTION 2: FOCAL SPOT SLIT RADIOGRAMS
8 - 2.1 Scope
8 - 2.2 Test equipment
8 - 2.2.1 SLIT CAMERA
9 - 2.2.2 RADIOGRAPHIC FILM
9 - 2.3 Test arrangement
9 - 2.3.1 Alignment of the SLIT CAMERA
10 - 2.3.2 Position of the SLIT CAMERA
11 - 2.3.3 Orientation of the slit diaphragm
12 - 2.3.4 Position of the RADIOGRAPHIC FILM
12 - 2.4 OperatIng conditions
12 - 2.4.1 X-RAY TUBE ASSEMBLY
13 - 2.4.2 LOADING FACTORS
13 - 2.5 Production of the FOCAL SPOT SLIT RADIOGRAMS
14 - 2.6 Statement of compliance
14 - SECTION 3: FOCAL SPOT PINHOLE RADIOGRAMS
14 - 3.1 Scope
14 - 3.2 Test equipment
14 - 3.2.1 PINHOLE CAMERA
15 - 3.2.2 RADIOGRAPHIC FILM
15 - 3.3 Test arrangement
15 - 3.3.1 Alignment of the PINHOLE CAMERA
16 - 3.3.2 Position of the PINHOLE CAMERA
16 - 3.3.3 Position of the RADIOGRAPHIC FILM
16 - 3.4 Operating conditions
17 - 3.5 Production of the FOCAL SPOT PINHOLE RADIOGRAMS
17 - 3.6 Statement of compliance
17 - SECTION 4: FOCAL SPOT STAR RADIOGRAMS
17 - 4.1 Scope
17 - 4.2 Test equipment
17 - 4.2.1 STAR PATTERN CAMERA
18 - 4.2.2 RADIOGRAPHI C FILM
18 - 4.3 Test arrangement
18 - 4.3.1 Alignment of the STAR PATTERN CAMERA
19 - 4.3.2 Position of the STAR PATTERN CAMERA
19 - 4.3.3 Position of the RADIOGRAPHIC FILM
19 - 4.4 Operating conditions
19 - 4.5 Production of the FOCAL SPOT STAR RADIOGRAMS
20 - 4.6 Statement of compliance
20 - SECTION 5: DETERMINATION OF FOCAL SPOT DIMENSIONS
20 - 5.1 Scope
22 - 5.2 Specified NOMINAL FOCAL SPOT VALUES
22 - 5.2.1 Nominal values
22 - 5.2.2 Actual values
22 - 5.3 Measurement and determination
22 - 5.3.1 Measurement
22 - 5.3.2 Measuring arrangement
22 - 5.3.3 Measurement of the linear dimensions
22 - 5.3.4 Accuracy of measurement
23 - 5.3.5 Determination of the width and the length of the FOCAL SPOT
23 - 5.4 Evaluation and statement of compliance
23 - 5.4.1 Evaluation of compliance
23 - 5.4.2 Statement of compliance
23 - 5.4.3 Marking of compliance
24 - SECTION 6: MODULATION TRANSFER FUNCTION
24 - 6.1 Scope
24 - 6.2 Specified MODULATION TRANSFER FUNCTIONS
24 - 6.3 Measuring equipment and measuring arrangement
25 - 6.4 Measurement
25 - 6.4.1 Measurement of the density distribution
25 - 6.4.2 Corrections to be applied
26 - 6.5 Calculation of the MODULATION TRANSFER FUNCTION
26 - 6.5.1 Calculation for the theoretical magnification approaching infinity
26 - 6.5.2 Calculation for the standard magnification
27 - 6.5.3 Calculation for finite magnification
27 - 6.6 Presentation of the MODULATION TRANSFER FUNCTION
27 - 6.7 Evaluation and statement of compliance
27 - 6.7.1 Evaluation of compliance of the MODULATION TRANSFER FUNCTION
28 - 6.7.2 Statement of compliance
28 - SECTI ON 7: STAR PATTERN RESOLUTION LIMIT
28 - 7.1 Scope
28 - 7.2 Specified STAR PATTERN RESOLUTION LIMIT
28 - 7.3 Measurement
29 - 7.4 Determination of the STAR PATTERN RESOLUTION LIMIT
29 - 7.4.1 Determination of magnification
29 - 7.4.2 STAR PATTERN RESOLUTION LIMIT for standard magnification
30 - 7.4.3 STAR PATTERN RESOLUTION LIMIT for finite magnification
30 - 7.4.4 Presentation of STAR PATTERN RESOLUTION LIMIT
30 - 7.5 Evaluation and statement of compliance
30 - 7.5.1 Evaluation of compliance
30 - 7.5.2 Statement of compliance
31 - SECTION 8: BLOOMING VALUE
31 - 8.1 Scope
31 - 8.2 SpecifIed BLOOMING VALUE
31 - 8.3 Determination of the BLOOMING VALUE
31 - 8.4 Evaluation and statement of compliance
31 - 8.4.1 Evaluation of compliance
32 - 8.4.2 Statement of compliance
33 - Annex A - Supply of SLI T CAMERAS, PI NHOLE CAMERAS and STAR PATTERN CAMERAS
34 - Annex B - Alignment to the REFERENCE AXIS
36 - Annex C - Index of defined terms

Describes measuring methods and requirements for test arrangements to be applied to the focal spots in diagnostic X-ray tube assemblies for medical use. This Standard is identical with and has been reproduced from IEC 336:1993.

This International Standard applies to FOCAL SPOTS in diagnostic X-RAY TUBE ASSEMBLIES for medical use, operating at X-RAY TUBE VOLTAGES up to and including 200 kV.This International Standard describes measuring methods and requirements for test arrangements to be applied for evaluating compliance with this standard together with the means of indicating compliance both of the specified characteristics of FOCAL SPOTS and the RADIOGRAMS prepared in checking these characteristics.

First published as Joint Standard AS/NZS 4274:1995.