Standard Practice for Direct Determination of Computed Tomography (CT) Detail Detection  Sensitivity and Calculation of Numerical Detection Limit

ASTM - ASTM International

ASTM E3505-25

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Year: 2025

Abstract: 5.1 This practice provides instructions for determining the detail detection sensitivity (DDS) and its numerical limit, DDSLimit, in X-ray computed tomography (CT) volumes from disk IQIs. DDS, along with modulation transfer function (MTF), contrast discrimination function (CDF), and contrast-detail-diagram (CDD), provides a way to determine the image quality in a reconstructed CT slice. See Test Method E1695 for a detailed description to measure and numerically evaluate MTF and CDF, and to document the result. See Guide E1441 for a detailed description of CDD. 5.2 DDS, along with Test Method E1695 MTF and CDF, and the derived DDSLimit enable evaluation of the performance and image quality of CT systems at the CT settings selected for the examination. These values are used to verify CT system performance and monitor long-term stability of CT systems related to the CT settings. Note 1: In a CT application, image quality can be affected by setup parameters and other circumstances. Some examples include image artifacts, position of flaws within the examination object, external factors (monitor quality, lighting, digital image format), human factors, and software performance, such as reconstruction, filters, and others. More application-oriented tests of image quality may be conducted using RQIs; see Practice E1817.

URI: https://yse.yabesh.ir/std/handle/yse/342771

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Standard Practice for Direct Determination of Computed Tomography (CT) Detail Detection Sensitivity and Calculation of Numerical Detection Limit

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contributor author	ASTM - ASTM International
date accessioned	2025-09-30T19:18:45Z
date available	2025-09-30T19:18:45Z
date copyright	2025
date issued	2025
identifier other	e3505-25.pdf
identifier uri	https://yse.yabesh.ir/std/handle/yse/342771
description abstract	5.1 This practice provides instructions for determining the detail detection sensitivity (DDS) and its numerical limit, DDSLimit, in X-ray computed tomography (CT) volumes from disk IQIs. DDS, along with modulation transfer function (MTF), contrast discrimination function (CDF), and contrast-detail-diagram (CDD), provides a way to determine the image quality in a reconstructed CT slice. See Test Method E1695 for a detailed description to measure and numerically evaluate MTF and CDF, and to document the result. See Guide E1441 for a detailed description of CDD. 5.2 DDS, along with Test Method E1695 MTF and CDF, and the derived DDSLimit enable evaluation of the performance and image quality of CT systems at the CT settings selected for the examination. These values are used to verify CT system performance and monitor long-term stability of CT systems related to the CT settings. Note 1: In a CT application, image quality can be affected by setup parameters and other circumstances. Some examples include image artifacts, position of flaws within the examination object, external factors (monitor quality, lighting, digital image format), human factors, and software performance, such as reconstruction, filters, and others. More application-oriented tests of image quality may be conducted using RQIs; see Practice E1817.
language	English
title	Standard Practice for Direct Determination of Computed Tomography (CT) Detail Detection Sensitivity and Calculation of Numerical Detection Limit	en
title	ASTM E3505-25	num
type	standard
status	Active
tree	ASTM - ASTM International:;2025
contenttype	fulltext
scope	1.1 This practice provides instructions for determining the detail detection sensitivity (DDS) and its numerical limit (DDSLimit) in slices of X-ray computed tomography (CT) volumes. 1.1.1 This practice defines image quality indicators (IQI) in the form of flat right circular cylinders (disk IQI) featuring a pattern of round or square holes of known dimension to determine the DDS. 1.1.2 This practice describes a procedure to measure the DDS with the defined disk IQI. 1.1.3 This practice describes a procedure to measure CDF, MTF, and CDD according to Test Method E1695 and Guide E1441 from the disk IQI and the estimation of the numerical limit of DDS, DDSLimit. 1.2 This practice does not intend to predict the detectability of specific object features or discontinuities in a specific application. Representative quality indicators (RQIs, Practice E1817), standard practices, and studies for probability of detection (Practices E2862 and E3023) should be considered for qualifying individual applications (see Guide E3327 and Practice E3375). 1.3 This practice describes the overall CT detail detection sensitivity (DDS) in an idealized object. Performance tests of system components such as X-ray tubes, gamma sources, and detectors are covered by separate documents (see Guide E1000, Test Method E1165, Practice E2597, Practice E2737, Test Method E2903) and should be considered for further system analysis. 1.4 This practice does not exclude other hole arrangements approved by the CEO. In such cases, the below analysis and interpretation might not be applicable, and the analysis should be described in a specific document approved by the CEO. 1.5 The values stated in SI units are to be regarded as the standard. Inch-pound units are provided for information only. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
identifier DOI	10.1520/E3505-25