IEC 60627 pdf download – Diagnostic X-ray imaging equipment — Characteristics of general purpose and mammographic anti-scatter grids
1 scope and object
This International Standard deals with the definitions，determination and indication ofcharacteristics of ANTI-SCATTER GRIDs used in diagnostic X-ray imaging equipment, in order toreduce the incidence of SCATTERED RADIATION，produced particularly in the body of thePATIENT，upon the lMAGE RECEPTION AREA and thus to improve the contrast of the X-RAYPATTERN.
In this standard only LINEAR GRIDs are considered.
Since at present only FocuSED GRIDs are used in mammography, this standard is restricted toFOCusED GRIDs for MAMMOGRAPHIC ANTI-SCATTER GRIDS.
This standard is not intended to be applied for AcCEPTANCE TESTs.
This standard does not cover the homogeneity of performance over the area of a grid.
This standard is intended to be applied for the demonstration of the characteristics of ANTI-SCATTER GRIDs under test conditions.These conditions are not usually available at the usER’ssite.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references,only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60417 (all parts),Graphical symbols for use on equipment
IEC 60601-1，Medical electrical equipment – Part 1: General requirements for safetyIEC 60788,Medical radiology – Terminology
IEC 61223-1,Evaluation and routine testing in medical imaging departments – Part 1: Generalaspects
IEC 61267,Medical diagnostic X-ray equipment – Radiation conditions for use in thedetermination of characteristics
3.1Degree of requirements
In this standard，certain terms which are not printed in sMALL CAPITALs have particularmeanings:
– “shall”
indicates a requirement that is mandatory for compliance;
– “should”
indicates a strong recommendation that is not mandatory for compliance;
“may”
indicates a permitted manner of complying with a requirement or of avoidingthe need to comply;
– “specific”
is used to indicate definitive information stated in this standard orreferenced in other standards，usually concerning particular operatingconditions, test arrangements or values connected with compliance;
– “specified”is used to indicate definitive information stated by the MANUFACTURER in
ACCOMPANYING DOCUMENTs or in other documentation relating to theEQUIPMENT under consideration,usually concerning its intended purpose, orthe parameters or conditions associated with its use or with testing todetermine compliance.
3.2use of terms
In this standard，terms printed in sMALL CAPITALS are used as defined in IEC 60601-1,inIEC 60788, in 3.3 of this standard or in other IEC publications referenced in annex B.
NOTE Attention is drawn to the fact, that in cases where the concept addressed is not strongly confined to thedefinition given in one of the publications listed above a corresponding term is printed in lower-case letters.
An index of defined terms used in this standard is given in annex B.
3.3Defined terms
For the purpose of this International Standard, the following definitions apply.
NOTE Some of the defined terms given in this standard deviate from those given in the current edition ofIEC 60788.
3.3.1
ANTI-SCATTER GRID
device with a fixed periodic arrangement of materials with different X-ray ATTENUATIONproperties to be placed in front of the MAGE RECEPTION AREA in order to reduce the incidenceof sCATTERED RADIATION upon that area and thus increase the contrast in the X-RAY PATTERN
3.3.2
LINEAR GRID
ANTI-SCATTER GRID composed of highly absorbing strips and highly transmitting interspaceswhich are parallel in their longitudinal direction
3.3.3
PARALLEL GRID
LINEAR GRID in which the planes of the absorbing strips are parallel to each other andperpendicular to the incident face
3.3.4
FocusED GRID
LINEAR GRID in which the planes of the absorbing strips converge to a straight line at theFOcusING DISTANCE
3.3.5
TAPERED GRID
LINEAR GRID in which the height of the absorbing strips decreases as the distance between theabsorbing strips and the TRUE CENTRAL LINE increases.This decrease is symmetrical aboutthe TRUE CENTRAL LINE
3.3.6
CROss-GRID
ANTI-SCATTER GRID composed of two LINEAR GRIDs built together in such a way that thedirections of their absorbing strips form an angle
3.3.6.1
ORTHOGONAL CRoss-GRID
CROSS-GRID in which the directions of the absorbing strips form an angle of 90
3.3.6.2
OBLIQUE CRoSs-GRID
CROSS-GRID in which the directions of the absorbing strips form an angle other than 90
3.3.7
STATIONARY GRID
ANTI-SCATTER GRID used in such a way that it does not move in relation to the RADIATION BEAM
3.3.8
MovING GRID
ANTI-SCATTER GRID used in an AcCESsORY that enables the ANTI-SCATTER GRID to be moved,when irradiated by a RADIATION BEAM, in order to avoid the imaging of the absorbing strips andthe consequent loss of information
3.3.9
MAMMOGRAPHIC ANTI-SCATTER GRID
FOCUSED GRID specially designed for mammography
NOTE lIn this standard the term “general purpose ANT-SCATTER GRID” is used to describe any ANTi-SCATTER GRIDnot specially designed for mammography.
3.3.10
Geometric characteristics
3.3.10.1
GRID RATIO,r
ratio between the height of the absorbing strips and the distance between the absorbing stripsin the centre of a LlNEAR GRID
IEC 60627 pdf download – Diagnostic X-ray imaging equipment — Characteristics of general purpose and mammographic anti-scatter grids
