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BS 7725-2.6(1995) : 1995

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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
Superseded date

30-11-2007

Published date

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

Will help in the establishment and operation of a quality assurance programme in the diagnostic X-ray department. Applies to radiological installations with diagnostic X-ray equipment for computed tomography. Also gives detailed terminology and annexes.

Committee
CH/62/2
DevelopmentNote
Supersedes 93/504902 DC (11/2005)
DocumentType
Standard
PublisherName
British Standards Institution
Status
Superseded
SupersededBy
Supersedes

BS 7725-2.3:1994 Evaluation and routine testing in medical imaging departments. Constancy tests Method for darkroom safelight conditions
BS 6641:1985 Glossary of medical radiology terms
BS 7725-1:1994 Evaluation and routine testing in medical imaging departments. General
BS 7725-2.1:1994 Evaluation and routine testing in medical imaging departments. Constancy tests Method for film processors
BS 7725-2.2:1994 Evaluation and routine testing in medical imaging departments. Constancy tests Method for radiographic cassettes and film changers and film-screen contact and relative sensitivity of the screen-cassette assembly

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