Standard Practice for Determining Relative Image Quality Response of Industrial Radiographic Imaging Systems from 4 to 25 MeV

Importancia y uso:

4.1 This standard provides a practice for determining the relative image quality response of a radiographic detector (film, CR imaging plate, or DDA) when exposed to 4 MeV to 25 MeV X-rays as any single component of the total X-ray system (for example, screens) is varied.

4.2 The practice is not intended to be used to compare two different systems or imaging types.

4.3 The approach uses RIQR evaluations of film and non-film imaging systems when exposed through an absorber material. Three alternate data evaluation methods are provided in Section 8. Determining RIQR requires the comparison of at least two radiographs or radiographic processes whereby the relative degree of image quality difference may be determined using the EPS plaque arrangement of Fig. 1 as a relative image quality indicator (RIQI). In conjunction with the RIQI, a specified radiographic technique or method must be established and carefully controlled for each radiographic process. This practice is designed to allow the determination of subtle changes in EPS that may arise to radiographic imaging system performance levels resultant from process improvements/changes, technique changes, or change of equipment attributes. This practice does not address relative unsharpness of a radiographic imaging system as provided in Practice E2002. The common element with any relative comparison is the use of the same RIQI arrangement for both processes under evaluation.

4.4 In addition to the standard evaluation method described in Section 8, there may be other techniques/methods in which the basic RIQR arrangement of Fig. 1 might be utilized to perform specialized assessments of relative image quality performance. For example, other radiographic variables can be altered to facilitate evaluations provided these differences are known and documented for both processes. Where multiple radiographic process variables are evaluated, it is incumbent upon the user of this practice to control those normal process attributes to the degree suitable for the application. RIQR may also be useful in evaluating imaging systems with alternate materials (RIQI and base plate). When using any of these specialized applications, the specific method or techniques used shall be as specified and approved by the RT Level III.

Subcomité:

E07.01

Referida por:

E1025-18, E0242-15R20, E3421-24, E0094_E0094M-22, E0592-20, E0746-23, E2033_E2033M-24, E1411-23

Volúmen:

03.03

Número ICS:

37.040.20 (Photographic paper, film and plates. Cartridges)

Palabras clave:

CR systems; DDA systems; EPS; equivalent penetrameter sensitivity; film; IQI; radiation; radiographic; Relative Image Quality Indicator; Relative Image Quality Response; X-ray;