BS 7725-2.6(1995) : 1995
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
EVALUATION AND ROUTINE TESTING IN MEDICAL IMAGING DEPARTMENTS - CONSTANCY TESTS - METHOD FOR X-RAY EQUIPMENT FOR COMPUTED TOMOGRAPHY
30-11-2007
23-11-2012
Introduction
1. Scope and object
1.1 Scope
1.2 Object
2. Normative references
3. Terminology
3.1 Degree of requirements
3.2 Use of terms
3.3 Definitions
4. General aspects of CONSTANCY TESTS
4.1 General conditions affecting test procedures
4.2 Establishment of BASELINE VALUES
4.3 Frequency of CONSTANCY TESTS
4.4 Identification of equipment, instrumentation and
test conditions
4.5 Measured functional parameters
5. Test methods
5.1 NOISE, MEAN CT NUMBERS and UNIFORMITY
5.2 SPATIAL RESOLUTION
5.3 SLICE THICKNESS
5.4 Dose
5.5 Positioning of the PATIENT SUPPORT
6. Statement of compliance
Figures
1. Schematic representation of a test pattern used to
check the constancy with respect to grey-scale
reproduction
2. Schematic representation of a test pattern used to
check the constancy with respect to geometry and
line structure
3. Schematic representation of a crosshatched pattern
used to carry out measurements with respect to
geometry
4. Schematic representation of a test pattern used to
check the constancy with respect to resolution
5. Schematic representation of a test pattern used to
check the constancy with respect to colour-related
aspects
6. Preventive measures to establish optimal working
conditions in workstations
Annexes
A. Terminology - Index of terms
B. Example of a form for the standardized test report
C. Guidance on action to be taken
D. Rationale
conditions
Annex ZA (normative) Other international publications
quoted in this standard with the references of the
relevant European publications
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