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ASTM E2737 Five Groove Wedge https://www.x-ray-forum.net/./22161106nx65772/iqi-image-quality-indicator-f91/astm-e2737-five-groove-wedge-t42.html |
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Author: | Colin Gan [ 16.05.2022, 10:17 ] |
Post subject: | Re: ASTM E2737 Five Groove Wedge |
Dear Klaus: When measuring MTR by using five-groove wedge phantom, how should I accurately determine that if the groove "disappeares in the noise" (9.3.1.2)? For now, I rely just on profiler analysis, but measurement results of the same picture were not consistent (a few millimeters of error). |
Author: | Klaus [ 17.05.2022, 18:27 ] |
Post subject: | Re: ASTM E2737 Five Groove Wedge |
The intention with the grooves is similar to the wire from the Wire Sets (ASTM or EN/ISO) and the five groove wedge was made for users who do not want to use too much technique when doing the evaluation. With the wire you say: "I see it" or "I don't see it" and here the visual interpretation was in our minds when we created this IQI. A deviation of a few millimeters should not be an issue as noise is mainly the limit ... |
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