AS/NZS 4434.1:1996

1 - AS/NZS 4434.1:1996 MEDICAL ELECTRICAL EQUIPMENT-MEDICAL ELECTRON ACCELERATORS - FUNCTIONAL PERFORMANCE CHARACTERISTICS
4 - PREFACE
5 - CONTENTS
7 - INTRODUCTION
7 - 1 Scope and object
7 - 1.1 Scope
7 - 1.2 Object
8 - 1.3 Environmental conditions
8 - 1.3.1 General
8 - 1.3.2 Transport and storage
8 - 1.3.3 Power supply
8 - 2 Terminology
8 - 2.1 Definitions
9 - 2.2 Degree of requirements
9 - 3 General information to the USER
9 - 3.1 Available NOMINAL ENERGIES and ABSORBED DOSE RATES
9 - 3.2 Available RADIATION FIELDS
9 - 3.3 NORMAL TREATMENT DISTANCE
9 - 3.4 Available FILTERS
10 - 3.5 Availability
10 - 3.6 Influencing quantities
10 - 3.7 Maintenance
10 - 3.8 Presentation
10 - 4 Standardized test conditions
10 - 4.1 Angle settings
10 - 4.2 Properties and positioning of the PHANTOM
10 - 4.3 Positioning of measuring points
11 - 4.4 RADIATION DETECTORS
11 - 4.5 STANDARD MEASUREMENT DEPTHS
11 - 4.5.1 X-RAY BEAMS
11 - 4.5.2 ELECTRON BEAMS
11 - 4.6 RADIATION FIELDS
11 - 4.7 ADJUSTMENTS DURING TEST
11 - 5 DOSE MONITORING SYSTEM
12 - 5.1 Reproducibility
13 - 5.2 Proportionality
13 - 5.2.1 Requirement
13 - 5.2.2 Information to the USER
13 - 5.2.3 Test
13 - 5.3 Dependence on angular positions
13 - 5.3.1 Information to the USER
14 - 5.3.2 Test
15 - 5.4 Dependence on GANTRY rotation
15 - 5.4.1 Information to the USER
15 - 5.4.2 Test
15 - 5.5 Dependence on the shape of the RADIATION FIELD
15 - 5.5.1 Information to the USER
16 - 5.5.2 Test
16 - 5.6 Stability of calibration
16 - 5.6.1 Stability after high ABSORBED DOSE delivered
17 - 5.6.2 Stability throughout the day
17 - 5.6.3 Stability throughout the week
18 - 5.7 Stability in MOVING BEAM RADIOTHERAPY
18 - 5.7.1 Information to the USER
18 - 5.7.2 Test
19 - 6 Depth ABSORBED DOSE characteristics
19 - 6.1 X-RADIATION
19 - 6.1.1 Depth dose charts
20 - 6.1.2 SURFACE DOSE
20 - 6.1.3 Isodose charts
21 - 6.2 ELECTRON RADIATION
21 - 6.2.1 Depth dose charts
21 - 6.2.2 Stability of PENETRATIVE QUALITY
22 - 6.2.3 SURFACE DOSE
23 - 6.2.4 Isodose charts
23 - 7 Uniformity of RADIATION FIELDS
23 - 7.1 X-RADIATION
23 - 7.1.1 Flatness of square X-RAY FIELDS
24 - 7.1.2 Deviation of dose distribution of square X-RAY FIELDS with angular positions
25 - 7.1.3 Symmetry of square X-RAY FIELDS
26 - 7.1.4 Maximum ratio of ABSORBED DOSE
27 - 7.1.5 X-RAY FIELDS with WEDGE FILTER
28 - 7.2 ELECTRON RADIATION
28 - 7.2.1 Flatness of ELECTRON FIELDS
29 - 7.2.2 Deviation of dose distribution of ELECTRON FIELDS with angular positions
29 - 7.2.3 Symmetry of ELECTRON FIELDS
30 - 7.2.4 Maximum ratio of ABSORBED DOSE
30 - 7.3 Penumbra of RADIATION FIELDS
30 - 7.3.1 Information to the USER
30 - 7.3.2 Test
31 - 8 Indication of RADIATION FIELDS
31 - 8.1 X-RADIATION
31 - 8.1.1 Numerical field-indication
33 - 8.1.2 LIGHT FIELD-INDICATOR
34 - 8.1.3 Reproducibility
34 - 8.2 ELECTRON RADIATION
34 - 8.2.1 Numerical field-indication
35 - 8.2.2 LIGHT FIELD-INDICATOR
36 - 8.3 Geometry of the BEAM LIMITING SYSTEM for X-RADIATION
36 - 8.3.1 Information to the USER
36 - 8.3.2 Test
36 - 8.4 Illuminance and penumbra of the LIGHT FIELD
36 - 8.4.1 Information to the USER
37 - 8.4.2 Test
37 - 9 Indication of the RADIATION BEAM AXIS
37 - 9.1 Indication on entry to the PATIENT
37 - 9.1.1 Information to the USER
37 - 9.1.2 Test
39 - 9.2 Indication on exit from the PATIENT
39 - 9.2.1 Information to the USER
39 - 9.2.2 Test
39 - 10 ISOCENTRE
39 - 10.1 Displacement of the RADIATION BEAM AXIS from the ISOCENTRE
40 - 10.1.1 Information to the USER
40 - 10.1.2 Test
41 - 10.2 Indication of the ISOCENTRE
41 - 10.2.1 Information to the USER
41 - 10.2.2 Test
41 - 11 Indication of distance along the RADIATION BEAM AXIS
41 - 11.1 Indicating device
42 - 11.2 Additional indicating device for equipment with variable distance between RADIATION SOURCE and ISOCENTRE and for...
42 - 11.2.1 Information to the USER
42 - 11.2.2 Test
42 - 12 Zero position of rotational scales
43 - 12.1 Information to the USER
43 - 12.2 Tests
43 - 12.2.1 Rotation of the GANTRY, Axis 1 and pitch of the RADIATION HEAD. Axis 3
43 - 12.2.2 Roll of the RADIATION HEAD, Axis 2 (Figures 1, 2 and 3)
43 - 12.2.3 Rotation of the BEAM LIMITING SYSTEM, Axis 4 (Figures 1, 2 and 3)
43 - 12.2.4 ISOCENTRIC rotation of the table, Axis 5 (Figure 1), and rotation of the table top, Axis 6 (Figure 1)
44 - 12.2.5 Pitch and roll of the table, Axes 7 and 8 (Figure 1)
44 - 13 Congruence of opposed RADIATION FIELDS
44 - 13.1 Information to the USER
44 - 13.2 Test
44 - 14 Movements of the PATIENT table
44 - 14.1 Vertical movement of the table
44 - 14.1.1 Information to the USER
45 - 14.1.2 Test
46 - 14.2 ISOCENTRIC rotation of the table
46 - 14.2.1 Information to the USER
46 - 14.2.2 Test
46 - 14.3 Parallelism of table rotational axes
46 - 14.3.1 Information to the USER
46 - 14.3.2 Test
47 - 14.4 Rigidity of the table
47 - 14.4.1 Longitudinal rigidity of the table
47 - 14.4.2 Lateral rigidity of the table
58 - APPENDIX A - TERMINOLOGY
58 - A1. Index of terms
59 - A2. Definitions
64 - APPENDIX B - FORMAT FOR PRESENTATION OF FUNCTIONAL PERFORMANCES VALUES

Specifies test procedures for the determination and disclosure of functional performance characteristics for electron accelerators to enable intending purchasers to compare performance of different models. It is identical with and has been reproduced from IEC 976:1989.

This standard applies to MEDICAL ELECTRON ACCELERATORS when used, for therapy purposes, in human medical practice.This standard applies to ELECTRON ACCELERATORS which deliver a RADIATION BEAMof either X-RADIATION OR ELECTRON RADIATION with NOMINAL ENERGIES in the range 1 MeVto 50 MeV at maximum ABSORBED DOSE RATES between 0,001 Gy s-1and 1 Gy s-1at 1 m fromthe RADIATION SOURCE and at NORMAL TREATMENT DISTANCES between 50 cm and 200 cm from the RADIATION SOURCE.The present standard describes a set of measurements requiring two to three months' work to complete. It specifies test procedures to be performed by the manufacturer at the design and construction stage of a MEDICAL ELECTRON ACCELERATOR but does not specify acceptance tests to be performed after installation at the purchaser's site. The accompanying report, IEC Publication 977, however, does suggest that many of the test procedures are appropriate for acceptance tests.The measurement conditions described in the present standard differ from those currently in use. This applies particularly to the PHANTOM position for measurements and the measurement of distances from the ISOCENTRE. These new conditions should be substituted for and not be added to present methods.

First published as AS/NZS 4434.1:1996.