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Significance and Use
4.1 This practice provides a means to compare DDAs on a common set of technical measurements, realizing that in practice, adjustments can be made to achieve similar results even with disparate DDAs, given geometric magnification, or other industrial radiologic settings that may compensate for one shortcoming of a device.
4.2 A user must understand the definitions and corresponding performance parameters used in this practice in order to make an informed decision on how a given DDA can be used in the target application.
4.3 The factors that will be evaluated for each DDA are: interpolated basic spatial resolution (iSRbdetector), efficiency (Detector SNR-normalized (dSNRn) at 1 mGy, for different energies and beam qualities), achievable contrast sensitivity (CSa), specific material thickness range (SMTR), image lag, burn-in, bad pixels and internal scatter radiation (ISR).
1.1 This practice describes the evaluation of Digital Detector Arrays (DDAs), and assures that one common standard exists for quantitative comparison of DDAs so that an appropriate DDA is selected to meet NDT requirements.
1.2 This practice is intended for use by manufacturers or integrators of DDAs to provide quantitative results of DDA characteristics for NDT user or purchaser consumption. Some of these tests require specialized test phantoms to assure consistency among results among suppliers or manufacturers. These tests are not intended for users to complete, nor are they intended for long term stability tracking and lifetime measurements. However, they may be used for this purpose, if so desired.
1.3 The results reported based on this standard should be based on a group of at least three individual detectors for a particular model number.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Other StandardsIEC62220-1 Medical Electrical Equipment Characteristics of Digital X-ray Imaging Devices Part 1: Determination of the Detective Quantum Efficiency Available from International Electrotechnical Commission (IEC), 3 rue de Varemb, Case postale 131, CH-1211, Geneva 20, Switzerland, http://www.iec.ch. ISO 7004 Photography--Industrial Radiographic Films--Determination of ISO Speed, ISO Average Gradient and ISO Gradients G2 and G4 When Exposed to X- and Gamma-Radiation Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
E1316 Terminology for Nondestructive Examinations
E1815 Test Method for Classification of Film Systems for Industrial Radiography
E2002 Practice for Determining Total Image Unsharpness in Radiology
E2445 Practice for Qualification and Long-Term Stability of Computed Radiology Systems
E2446 Practice for Classification of Computed Radiology Systems
ICS Number Code 11.040.50 (Radiographic equipment)
UNSPSC Code 32101519(Detectors)