BS 6530(1994) : 1994 AMD 8835

Committees responsible
National foreword
Methods
Introduction
Section 1. GENERAL
1.1 Scope and object
1.2 Normative references
1.3 Terminology
Section 2. FOCAL SPOT SLIT RADIOGRAMS
2.1 Scope
2.2 Test equipment
2.3 Test arrangement
2.4 Operating conditions
2.5 Production of the FOCAL SPOT SLIT RADIOGRAMS
2.6 Statement of compliance
Section 3. FOCAL SPOT PINHOLE RADIOGRAMS
3.1 Scope
3.2 Test equipment
3.3 Test arrangement
3.4 Operating conditions
3.5 Production of the FOCAL SPOT PINHOLE RADIOGRAMS
3.6 Statement of compliance
Section 4. FOCAL SPOT STAR RADIOGRAMS
4.1 Scope
4.2 Test equipment
4.3 Test arrangement
4.4 Operating conditions
4.5 Production of the FOCAL SPOT STAR RADIOGRAMS
4.6 Statement of compliance
Section 5. DETERMINATION OF THE FOCAL SPOT DIMENSIONS
5.1 Scope
5.2 Specified NOMINAL FOCAL SPOT VALUES
5.3 Measurement and determination
5.4 Evaluation and statement of compliance
Section 6. MODULATION TRANSFER FUNCTION
6.1 Scope
6.2 Specified MODULATION TRANSFER FUNCTIONS
6.3 Measuring equipment and measuring arrangement
6.4 Measurement
6.5 Calculation of the MODULATION TRANSFER FUNCTION
6.6 Presentation of the MODULATION TRANSFER FUNCTION
6.7 Evaluation and statement of compliance
Section 7. STAR PATTERN RESOLUTION LIMIT
7.1 Scope
7.2 Specified STAR PATTERN RESOLUTION LIMIT
7.3 Measurement
7.4 Determination of the STAR PATTERN RESOLUTION LIMIT
7.5 Evaluation and statement of compliance
Section 8. BLOOMING VALUE
8.1 Scope
8.2 Specified BLOOMING VALUE
8.3 Determination of the BLOOMING VALUE
8.4 Evaluation and statement of compliance
Annexes
A (informative) Supply of SLIT CAMERAS, PINHOLE
     CAMERAS and STAR PATTERN CAMERAS
B (informative) Alignment to the REFERENCE AXIS
C (informative) Index of defined terms
Tables
1 Magnification for FOCAL SPOT SLIT RADIOGRAMS
2 LOADING FACTORS
3 Dimensions of the pinhole
4 Magnification for FOCAL SPOT PINHOLE RADIOGRAMS
5 Permissible values of FOCAL SPOT dimensions for
     NOMINAL FOCAL SPOT VALUES
6 Standard magnification for MODULATION TRANSFER
     FUNCTIONS
7 Standard magnification for STAR PATTERN RESOLUTION
     LIMIT
8 LOADING FACTORS for the determination of the
     BLOOMING VALUE
Figures
1 Essential dimensions of the slit diaphragm
2 Alignment of the SLIT CAMERA
3 References dimensions and planes
4 Directions of evaluation over distorted FOCAL SPOTS
5 Essential dimensions of a pinhole diaphragm
6 Alignment of the PINHOLE CAMERA
7 Essential dimensions of the test pattern
8 Alignment of the STAR PATTERN CAMERA
9 Alignment of the slit of the microdensitometer
10 Limitation of input data
11 Image of the test pattern
B.1 Projection of the ACTUAL FOCAL SPOT on the
     REFERENCE PLANE

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. Includes the following sections: focal spot slit radiogram; focal spot pinhole radiogram; focal spot star radiograms; determination of focal spot dimensions; modulation transfer function; star pattern resolution limit; blooming value. Also includes detailed tables, diagrams and annexes.