ISO 9236-1:2004 PDF

Photography — Sensitometry of screen/film systems for medical radiography — Part 1: Determination of sensitometric curve shape, speed and average gradient

Название (английский):

ISO 9236-1:2004

Photography — Sensitometry of screen/film systems for medical radiography — Part 1: Determination of sensitometric curve shape, speed and average gradient

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 25
Дата публикации:: 27 января 2004 г.
Издание:: ISO IS 9236 edition 2 version 1
ICS:: 37.040.25

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Описание (английский):

ISO 9236-1:2004 specifies methods for the determination of the sensitometric curve shape, average gradient and speed of a single sample of a screen/film/filmholder/processing system for medical radiography. It is not applicable to special radiographic applications such as mammography, dental radiography and direct-exposing medical radiographic systems (see for example ISO 5799). The filmholder can be any means that ensures close screen/film contact and prevents the film from being exposed to ambient light. In particular, the filmholder can be a light-tight vacuum bag, as often used in the laboratory, or a radiographic cassette as used in medical radiography.

Технические детали

Технический комитет: ISO/TC 42 - Photography
SKU: ISO 9236-1:2004

Abstract

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:

Overview

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:

ISO 9236-1:2004 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

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Abstract

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