1.8.2022
2.4.
EN
Official Journal of the European Union
L 201/69
Image quality tests
The image quality tests for the X-ray equipment should be performed by using the human perception (HP) test piece described in the following international standard: — ASTM F792-17e1, Standard Practice for Evaluating the Imaging Performance of Security X-Ray Systems, ASTM International, West Conshohocken, PA, 2017, www.astm.org The image quality of the X-ray equipment should be assessed by using the following nine tests: 2.4.1.
Test 1: wire display — the ability of an X-ray equipment to display images that can be used by an operator to identify metal wires.
2.4.2.
Test 2: useful penetration — the ability of an X-ray equipment to produce an image that allows for the detection, by an operator or algorithm, of wires that are hidden by different thicknesses of blocking material.
2.4.3.
Test 3: spatial resolution — the ability of an X-ray equipment to display closely spaced, high-contrast items as separate.
2.4.4.
Test 4: simple penetration — the ability of an X-ray equipment to display images that can be used by an operator to identify lead numerals that would otherwise be hidden by steel blocking material.
2.4.5.
Test 5: thin organic imaging — the ability of an X-ray equipment to display images that can be used by an operator to identify thin pieces of organic material.
2.4.6.
Test 6: steel contrast sensitivity — the ability of an X-ray equipment to display images that can be used by an operator to identify shallow circular recesses in steel.
2.4.7.
Test 7: materials discrimination — the ability of an X-ray equipment to display images that can be used by an operator to discriminate between materials with different effective atomic numbers.
2.4.8.
Test 8: materials classification — the ability of an X-ray equipment to display images that can be used by an operator to consistently identify a particular material over a range of different thicknesses.
2.4.9.
Test 9: organic differentiation — the ability of an X-ray equipment to display images that can be used by an operator to differentiate between organic materials of different effective atomic numbers.
2.5.
Image quality thresholds
With reference to the human perception (HP) test piece in ASTM F792-17e1, the minimum thresholds for each image quality test should be as described in Table 2.3 below.
To qualify for a specific standard, the X-ray equipment should reach the respective minimum thresholds for all image quality tests.