SIST ISO 9236-1:2011 PDF

Overview

ISO 9236-1:2004 - Photography - Sensitometry of screen/film systems for medical radiography - Part 1 - defines standardized methods to determine the sensitometric curve shape, speed, and average gradient of a single screen/film/filmholder/processing system used in medical radiography. The standard excludes special modalities such as mammography, dental radiography and direct-exposing systems. It covers laboratory and clinical-like test conditions, measurement uncertainties, and reporting.

Key topics and technical requirements

• Sensitometric curve shape: Measured under low-scatter conditions using intensity-scale X‑ray sensitometry (preferably an inverse‑square sensitometer). The curve (density vs log exposure) is the basis for other metrics.
• Average gradient: Defined as the slope joining two specified points on the sensitometric curve - a measure of effective contrast.
• Speed: Quantitative response of the screen/film system for specified exposure, processing and measurement conditions. Speed is measured under simulated clinical exposures (with phantoms) and requires absolute air‑kerma measurement in gray (Gy).
• Beam and equipment: Use high‑frequency (multipulse) or at least 12‑pulse high‑voltage generators; tungsten or tungsten‑based targets; permanent filtration equivalent to 2.5 mm ± 0.2 mm Al.
• Dosimetry: Calibrated detectors required. Air‑kerma uncertainty: