What is the purpose of using an image quality indicator in radiographic testing?

The purpose of using an image quality indicator (IQI) in radiographic testing is to assess the quality of the radiograph. An IQI is a recognized tool that helps ensure that the radiographic technique used is capable of producing images that meet the required standards. It provides a means to evaluate the contrast, resolution, and overall visibility of the features within the radiograph, particularly important when checking for the presence of defects.

By incorporating an IQI, inspectors can confirm whether the imaging conditions were adequate and whether the resultant radiograph is suitable for interpretation. This assessment is critical because the ability to detect defects and anomalies relies heavily on the clarity of the radiographs produced. Without proper verification of the image quality, there could be a risk of either missing significant defects or mistaking non-defects for critical issues, both of which could have severe consequences in terms of safety and integrity of structures or components being tested.