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Relative Image Quality Indicator (RIQI) ASTM E747
Relative Image Quality Indicator (RIQI) ASTM E747
Could anyone please explain the how to use and importance of relative image quality indicator (RIQI) as illustrated in ASTM E746-14 (figure 4)? The standard specifies an estimation methodology named Graph method of determining RIQI. It’s showing plotting a curve EPS % in X-axis and ratio of (no of visible holes/ no. of total hole) in y-axis. At 0.5 ratio on Y-axis, the corresponding EPS% you termed as POD 50%. I am interested to know about the real application of this curve or what its exactly the curve represent to user. Thank in advance for your efforts.
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ASTM E746-18 provides a method of comparing the performance of two (or more) radiographic testing systems. For example, you may wish to compare two manufacturer’s films of nominally the same class, or compare the results of changing the developer chemistry.
By assessing the Equivalent Penetrameter Sensitivity at 50% Probability of Detection, the systems can be compared. For CR, IP plates could be compared; for DDAs the effect of changing the scintillator could be compared.
The best way of learning how to use the RIQIs and ASTM E746 is to practice and see the results. The importance of the specification and RIQI will depend on the reason for the comparison
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