IE-NDT Ltd.,Unit C, Heath Farm, Swerford, OX7 4BN
IE-NDT Ltd.
Europes Leading Manufacturer and Supplier of;
IQI’s / Image Quality Indicators, Penetrameters,Duplex IQI, Spatial Resolution and Focal Spot Patterns,
Viewing
Radiation Safety
Lead Marker Tapes
Spatial Resolution Line Pair Patterns
Focal Spot Star Patterns
These test patterns are designed for quick quantitative assessments of the limiting spatial resolution of an x-ray system. The line pair patterns consist of a thin foil of Lead sandwiched between plastic plates. In the foil, linear slits are cut with a range of widths, these alternate with linear bars of the foil of equal width. One slit and one bar is referred to as a line pair, and the width of each group of lines is specified in terms of the number of line pairs per mm (LP/mm). The observer counts the number of groups in which he can resolve the slits from the bars and as such can determine the resolving capability of the x-ray system in terms of LP/mm. A wide range of pattern designs is available with varying ranges of LP/mm and foil thicknesses.
Line pair test patterns are available in ranges of line pair groups from 0.25 to 30 line pairs per millimetre (LP/mm)
The Spatial Resolution Line Pair Patterns and available with Calibration Certificates.
Spatial Resolution Line Pair Patterns & Focal Spot Star Patterns
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Focal Spot Star Patterns
These test patterns are designed for quick quantitative assessments of the focal spot size of an x-ray system. The star pattern comprises a thin foil of Lead into which are cut a pattern of slits diverging from a central point which can be used to measure the Xray focal spot size. The separation between slits increases linearly with distance from the centre. When imaged with an X-ray source, the finite size of the X-ray source will cause the lines to blur together within a certain distance of the centre. The radius of the blur will be directly proportional to the size of the focal spot.
Star test patterns are available with a choice of 0.25, 0.5, 1.0, 1.5 and 2.0 degree spoke angles.
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