Standard Historical Last Updated: Jul 24, 2013 Track Document
ASTM E1475-02(2008)

Standard Guide for Data Fields for Computerized Transfer of Digital Radiological Examination Data

Standard Guide for Data Fields for Computerized Transfer of Digital Radiological Examination Data E1475-02R08 ASTM|E1475-02R08|en-US Standard Guide for Data Fields for Computerized Transfer of Digital Radiological Examination Data Standard new BOS Vol. 03.03 Committee E07
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Significance and Use

The primary use of this guide is to provide a standardized approach for the data file to be used for the transfer of digital radiological data from one user to another where the two users are working with dissimilar systems. This guide describes the contents, both required and optional for an intermediate data file that can be created from the native format of the radiological system on which the data was collected and that can be converted into the native format of the receiving radiological data analysis system. The development of translator software to accomplish these data format conversions is being addressed under a separate effort; this will include specific items needed for the data transfer, for example, language used, memory requirements, and intermediate specification. This guide will also be useful in the archival storage and retrieval of radiological data as either a data format specifier or as a guide to the data elements which should be included in the archival file.


TABLE 1 Field Listing

Field NumberAField Name and DescriptionCategory Sets, Values and UnitsB
Header Information:
1C,DIntermediate file nameAlphanumeric string
2C,DFormat revision codeAlphanumeric string
3C,DFormat revision dateyy/mm/dd
4C,DSource file nameAlphanumeric string
5Examination file description notesAlphanumeric string
6C,DExamining company/locationAlphanumeric string
7C,DExamination dateyy/mm/dd
8Examination timehh/mm/ss
9C,DType of examinationAlphanumeric string
10Other examinations performedAlphanumeric string
11C,DOperator nameAlphanumeric string
12C,DOperator identification codeAlphanumeric string
13C,DASTM, ISO or other applicable standard specificationAlphanumeric string
14Date of applicable standardyy/mm/dd
15C,DAcceptance criteriaAlphanumeric string
16NotesAlphanumeric string
Examination System Description:
17Examination system manufacturer(s)Alphanumeric string
18Examination system modelAlphanumeric string
19Examination system serial numberAlphanumeric string
Source Section:
20C,DRadiologic source manufacturerAlphanumeric string
21C,DRadiological source modelAlphanumeric string
22General source descriptionAlphanumeric string
23Last calibration dateAlphanumeric string
24Notes on source sectionAlphanumeric string
Image Receptor Section:
25C,DReceptor typeAlphanumeric string
26C,DConvertor typeAlphanumeric string
27Receptor manufacturerAlphanumeric string
28Receptor model numberAlphanumeric string
29C,DNotes on receptor sectionAlphanumeric string
Exposure Section:
30C,DPeak radiation energy used, orkV
31C,DIsotope source (use either 30 or 31)Alphanumeric string
32Tube currentmA
33Radiation dosage ratemR/min
34Radiation exposure timemin
35CSource-detector distance (SDD)m
36CSource-object distance (SOD)m
37CImage magnification of source side of examination object%
38DNotes on exposure sectionAlphanumeric string
Processing Section (Film/Paper):
39EProcess descriptionAutomated or manual
40EProcess methodWet or dry
41Processor typeAlphanumeric string
42Processor model numberAlphanumeric string
43Notes on processor sectionAlphanumeric string
Image Processing Description:
44C,DImage processing used for image dataAlphanumeric string
45Image processor hardware manufacturerAlphanumeric string
46Image processor hardware modelAlphanumeric string
47Image processor software sourceAlphanumeric string
48Image processor software versionAlphanumeric string
49DPixel resolutionPixels per cm
50Notes on image processorAlphanumeric string
Examination Sample or Part Description:
51CSample or part nameAlphanumeric string
52Sample or part name descriptionAlphanumeric string
53CSample or part identification codeAlphanumeric string
54CSample or part materialAlphanumeric string
55Notes on sample or partAlphanumeric string
56CNumber of image segments for sampleInteger number
57CReference standard identificationAlphanumeric string
58Reference standard descriptionAlphanumeric string
59CReference standard file nameAlphanumeric string
60Reference standard file locationAlphanumeric string
Coordinate System and Scan Description:
61FMachine coordinate system scan axisAlphanumeric string
62FMachine coordinate system index axisAlphanumeric string
63FMachine coordinate system z-axisAlphanumeric string
64FPart coordinate system x-axisAlphanumeric string
65FPart coordinate system y-axisAlphanumeric string
66FPart coordinate system z-axisAlphanumeric string
67Number of object target pointsInteger number
68Object target point numberInteger number
69Object target point descriptionAlphanumeric string
70Object target point x-axisAlphanumeric string
71Object target point y-axisAlphanumeric string
72Object target point z-axisAlphanumeric string
73Description of data plane projectionAlphanumeric string
74Notes on coordinate systemAlphanumeric string
Measurement Parameters:
75CMinimum value of dataInteger
76CMaximum value of dataInteger
77CDynamic range resolutionNumber of bits
78C,DData scaleLinear, logarithmic, define scale
79ERelationship between film optical density and digital valueMathematical relationship between film density and digital value; range of
density covered (04, 0.54.5, etc.)
80C,DDynamic range implementedDetected exposure range covered by gray scale of each pixel in image
data file. Expressed as decades of
exposure latitude (1.6, 2, 4, etc.)
Industrial film/screen/chemistry
systems are typically 2
81CPhysical spacing of the digitization interval at the image receptorScans/mm (100 μm, 80 μm, 50 μm, 25
μm, etc.)
82CData recording formatAlphanumeric string
Examination Results:
83Discontinuity locationAlphanumeric string
84Discontinuity descriptionAlphanumeric string
85DispositionAccept, reject or repair
86Notes on examination resultsAlphanumeric string
87Image segment numberInteger number
88Image segment descriptionAlphanumeric string
89Image segment locationAlphanumeric string
90Image segment orientationAlphanumeric string
91AnnotationAlphanumeric string
92Notes on the data (including notes on compression)Alphanumeric string
93Total number of data pointsInteger number
94Actual stream of radiologic dataReal number

A Field numbers are for reference only. They do not imply a necessity to include all these fields in any specific database nor imply a requirement that fields used be in this particular order.

B Units listed first are SI; those in parentheses are inch-pound (English).

C Denotes essential field for computerization of examination results, regardless of examination method.

D Denotes essential field for radiographic examination.

E Denotes essential field for radiographic examination.

F Denotes essential field for radioscopic examination.

Although the recommended field listing includes more than 90 field numbers, only about half of those are regarded as essential and are marked Footnote C in Table 1. Fields so marked must be included in the data base. The other fields recommended provide additional information that a user will find helpful in understanding the radiological image and examination result. These header field items will, in most cases, make up only a very small part of a radiological examination file. The actual stream of radiological data that make up the image will take up the largest part of the data base. Since a radiological image file will normally be large, the concept of data compression will be considered in many cases. Compressed data should be noted, along with a description of the compression method, as indicated in Field No. 92 (see Table 1).

This guide provides a data file for a single image. It is recognized that a complete examination record may contain several files for the same examination method in different areas, with or without image processing, for different examination methods, and for variations within a single method (for example, different x-ray energies). This file will permit the examination of a single image and will include information about the existence of other images and records for the examined object. This single image may be one created by overlaying or processing results from multiple examination approaches, for example, data fusion. For such images, the notes sections must clearly state how the image for this file was created.

Scope

1.1 This guide provides a listing and description of the fields that are recommended for inclusion in a digital radiological examination data base to facilitate the transfer of such data. This guide sets guidelines for the format of data fields for computerized transfer of digital image files obtained from radiographic, radioscopic, computed radiographic, or other radiological examination systems. The field listing includes those fields regarded as necessary for inclusion in the data base: (1) regardless of the radiological examination method (as indicated by Footnote C in Table 1), (2) for radioscopic examination (as indicated by Footnote E in Table 1), and (3) for radiographic examination (as indicated by Footnote D in Table 1). In addition, other optional fields are listed as a reminder of the types of information that may be useful for additional understanding of the data or applicable to a limited number of applications.

1.2 It is recognized that organizations may have in place an internal format for the storage and retrieval of radiological examination data. This guide should not impede the use of such formats since it is probable that the necessary fields are already included in such internal data bases, or that the few additions can easily be made. The numerical listing and its order indicated in this guide is only for convenience; the specific numbers and their order carry no inherent significance and are not part of the data file.

1.3 The types of radiological examination systems that appear useful in relation to this guide include radioscopic systems as described in Guide E 1000, Practices E 1255, E 1411 and E 2033, and radiographic systems as described in Guide E 94 and Practices E 748 and E 1742. Many of the terms used are defined in Terminology E 1316.

1.4 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.

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Details
Book of Standards Volume: 03.03
Developed by Subcommittee: E07.11
Pages: 5
DOI: 10.1520/E1475-02R08
ICS Code: 35.240.80