Proper management of the clinical exposure index based on body thickness using dose optimization tools in digital chest radiography: A phantom study

Yongsu Yoon, Hyemin Park, Jungmin Kim, Jungsu Kim, Younghoon Roh, Nobukazu Tanaka, Junji Morishita

Research output: Contribution to journalArticlepeer-review

Abstract

In radiography, the exposure index (EI), as per the International Electrotechnical Commission standard, depends on the incident beam quality and exposure dose to the digital radiography system. Today automatic exposure control (AEC) systems are commonly employed to obtain the optimal image quality. An AEC system can maintain a constant incident exposure dose on the image receptor regardless of the patient thickness. In this study, we investigated the relationship between body thickness, entrance surface dose (ESD), EI, and the exposure indicator (S value) with the aim of using EI as the dose optimization tool in digital chest radiography (posterior–anterior and lateral projection). The exposure condition from the Korean national survey for determining diagnostic reference levels and two digital radiography systems (photostimulable phosphor plate and indirect flat panel detector) were used. As a result, ESD increased as the phantom became thicker with constant exposure indicator, which indicates similar settings to an AEC system, but the EI indicated comparatively constant values without following the tendency of ESD. Therefore, body thickness should be considered under the AEC system for introducing EI as the dose optimization tool in digital chest radiography.

Original languageEnglish
Article number5203
JournalInternational journal of environmental research and public health
Volume18
Issue number10
DOIs
Publication statusPublished - May 2 2021

All Science Journal Classification (ASJC) codes

  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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