Standard Practice for Evaluating DICONDE Interoperability for Image and Presentation State Display

Abstract

5.1 This practice describes the recommended procedure for NDE system manufacturers and NDE system purchasers to assess a system’s level of compliance and conformance to the DICONDE standard related to image and presentation state display. Manufacturers shall document the compliance of their system in their DICONDE Conformance Statement document. 5.2 Screen Output of DICOM Image Data—Unlike most common computer graphics file formats, the data encoded in DICONDE images is not intended to directly encode the data required to produce a display for viewing on a monitor. Often, DICONDE pixel value data spans a dynamic range too great for direct display, and the DICONDE viewer software must map a subset of the data range into a reduced range that can be displayed on a monitor. The displayable range depends on the graphics adapter used to control the monitor. The PR testing procedures described in this practice expect a standard 24-bit RGB output with 8 bits each of Red-Green-Blue (RGB) channels for color monitors to be used for the validation of results, and the three 8-bit RGB channels are output with equal values to produce shades of gray on the display monitor. Hence, output of the graphics board to the display shall not use any look-up-table to modify or calibrate values and shall be configured such that the output to the monitor exactly reproduces the values input to the graphics adapter (“identity” transformation). 5.3 Consistent Presentation of Images (CPI) Test Image Collection—The grayscale images and presentation state files6 that are used in this test collection are part of a test suite that was created for interoperability testing in healthcare and thus are DICOM-compliant files. The color test images are also DICOM-compliant and have been created and added by ASTM E07.11. Test objects can be found on the E07.11 DICONDE subcommittee page.7 5.3.1 Grayscale Images—The CPI collection for grayscale image testing includes both a basic set of images and an optional set, each containing differently encoded pixel data. The basic set contains images with unsigned 8-bit, 12-bit, 15-bit, and 16-bit pixel value data types. The optional set contains images with signed data types and images with an embedded LUT. Each CPI grayscale test image represents a standard SMTPE RP-133 test pattern. When displayed successfully, each image shall trigger a display adapter output of grayscale Digital Driving Level (DDL) values ranging from 0 through 255 (for 8-bit graphics adapters), as shown in Fig. 1.Scope 1.1 This practice covers procedures for testing DICONDE compliance of the display of grayscale and color images, annotations and measurements on software systems used for evaluation of DICONDE data. 1.2 Units—Although this practice contains no values that require units, it does describe methods to store and communicate data that do require units to be properly interpreted. The SI units required by this practice are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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.