What are image quality indicator (IQI) sensitivity values?

In this article:

• IQI Sensitivity Values Quantify Radiographic Image Quality: Image Quality Indicators (IQIs) are used to assess the sensitivity of a radiographic technique, with sensitivity values expressed as a percentage of the object’s thickness.
• Lower Sensitivity Values Indicate Higher Image Quality: A smaller percentage value means better flaw detectability, as it reflects the ability to visualize smaller discontinuities relative to the material thickness.
• IQI Type and Material Thickness Influence Acceptance Criteria: The required sensitivity value depends on the specific IQI used (e.g., wire-type or step-hole) and the thickness of the object being inspected, as defined by applicable standards.
• IQIs Are Essential for Code Compliance and Quality Assurance: Sensitivity values help ensure that radiographic inspections meet industry codes and standards, providing traceable evidence of inspection quality.
• Proper IQI Placement and Interpretation Are Critical: IQIs must be positioned correctly on the test object and interpreted accurately to validate the radiographic technique and confirm that required sensitivity levels are achieved.