How can planar flaw size be estimated from UT data?

• A. Use calibrated reference reflectors and the echo amplitude/depth information from A- or B-scans, applying a sizing relation or DAC curve.
• B. Compare the color of the display to a standard chart.
• C. Count the number of echoes and assume size proportional to the count.
• D. Estimate from transducer frequency alone.

Answer: (A)