Name: ISO 19232-5:2018 — Non-destructive testing — Image quality of radiographs — Part 5: Determination of the image unsharpness and basic spatial resolution value using duplex wire-type image quality indicators
SKU: ISO 19232-5:2018
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Overview

ISO 19232-5:2018 - Non‑destructive testing (NDT) - Image quality of radiographs - Part 5 specifies a standardized method for determining total image unsharpness and basic spatial resolution of radiographs and radioscopic images using duplex wire‑type image quality indicators (IQIs). The standard defines IQI construction, marking and conformity requirements, and practical evaluation procedures for both film and digital detectors.

Key topics and requirements

Duplex wire‑type IQI design: A series of up to 13 duplex wire pairs mounted in a rigid transparent holder. Wires D1–D3 are tungsten; remaining elements are platinum. Wire diameter (d) equals spacing between wires.
Measurement concepts:
- Total image unsharpness (UT) is given by 2·d.
- Basic spatial resolution (SRb) equals half of the measured unsharpness.
- Linepair/mm value is 1/(2·d).
Wire sizes: Duplex elements span fine to coarse pairs (e.g., wire diameters/spacing from ~0.05 mm to ~0.80 mm), enabling resolution readings up to ~10 lp/mm for the finest pairs (values per Table 1 in the standard).
Use limits by X‑ray tube voltage:
- IQIs with up to 13 wire pairs effective up to 600 kV.
- IQIs with more than 13 wire pairs intended for tube voltages <225 kV. Results may be unsatisfactory in the megavolt range.
Evaluation methods:
- Visual evaluation on film/monitor (magnification up to 4×; use >2× lens for very fine pairs).
- Digital evaluation with profile function: determine first duplex pair with

ISO 19232-5:2018 PDF

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