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The New Exposure Indicator for Digital Radiography.

Euclid Seeram1

  • 1Faculty of Health Sciences, University of Sydney, Australia; School of Biomedical Sciences, Monash University, Australia; Faculty of Science, Charles Sturt University, Australia.

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|May 5, 2019
PubMed
Summary
This summary is machine-generated.

The new International Electrotechnical Commission standardized exposure indicator (EI) for digital radiography offers better dose control. It helps technologists optimize patient dose and image quality using target EI (EIT) and deviation index (DI).

Keywords:
deviation index (DI)digital radiographyinternational standardized EInew exposure indicator (EI)target EI

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Area of Science:

  • Medical Physics
  • Radiologic Technology
  • Diagnostic Imaging

Background:

  • Traditional film-screen radiography has limitations due to narrow exposure latitude.
  • Digital radiography systems (computed radiography and flat-panel) offer wide exposure latitude and image processing.
  • These systems display an exposure indicator (EI) to guide technologists on detector exposure levels.

Purpose of the Study:

  • To describe the essential elements of the new standardized exposure indicator (EI) by the International Electrotechnical Commission (IEC).
  • To explain the components of the standardized EI, including standardization efforts, deviation index (DI), and target EI (EIT).
  • To highlight the responsibilities of manufacturers and users in implementing the new EI system.

Main Methods:

  • Review of limitations in film-screen radiography.
  • Description of computed radiography and flat-panel digital radiography systems.
  • Detailed explanation of the IEC's standardized exposure indicator (EI) elements: standardization, deviation index (DI), and target EI (EIT).
  • Discussion of user and manufacturer responsibilities.
  • Presentation of optimization research for determining EIT values.

Main Results:

  • The new standardized EI is proportional to detector exposure.
  • Users must establish target EI (EIT) values for examinations to optimize dose and image quality.
  • The deviation index (DI) calculation provides immediate feedback on exposure accuracy.

Conclusions:

  • The standardized EI, EIT, and DI facilitate dose-patient image quality optimization in digital radiography.
  • Objective determination of EIT values is achievable through optimization research.
  • This standardized approach enhances consistency and quality in digital radiography examinations.