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The implementation of digital radiography in terms of the use of target exposure index and deviation index
Poster Title: The implementation of digital radiography in terms of the use of target exposure index and deviation index
Submitted on 26 Oct 2020
Author(s): Jónína Guðjónsdóttir (1,2), Karin Elisabeth Paalsson (3), Guðrún Paulomi Sveinsdóttir(1)
Affiliations: (1) Faculty of Medicine, University of Iceland (2) Icelandic Radiation Safety Authority (3) Landspítali - The National University Hospital of Iceland
This poster was presented at BIR Annual Congress 2020
Poster Views: 409
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Poster Information
Abstract: Exposure index (EI) is important to evaluate correct exposure in radiography and thus important for image quality.
The purpose of this study was to evaluate the implementation of digital equipment based on the use of target exposure index (EIT) and deviation index (DI).
Radiography departments, using <10 years old equipment, were invited to participate. For each piece of equipment superusers were asked about the use of EIT and data was gathered on EIT for five body parts (BP); lumbar spine, chest, hip, knee and hand. For each of the five BP, 100 examinations from the past year were selected randomly (or all, if <100); the EI recorded from one predefined view and the DI calculated.
Ten pieces of equipment were included in the study, from four manufacturers, at eight sites. Among the sites were a university hospital, smaller hospitals and miscellaneous private departments. Two sites (25%) had not configured EIT, five (62,5%) used default values and only one had revised EIT values. In four departments (50%) radiographers favoured “acceptable EI range” over DI.
The mean EI was significantly different (p<0.05) from the EIT in majority of the five BP in four out of the six sites that had defined EIT. 30% of images from all sites combined had DI outside of the range of -3.0 < DI < +3.0.
In conclusion, the study shows that that the EIT and DI are not used efficiently, independent of equipment vendor or department characteristics, which indicates insufficient implementation.
Summary: In this study it was revealed that the correct exposure in digital radiography, in terms of deviation index (DI) or exposure index (EI), was often unclear and that, independent of equipment type, department and body part, the mean EI was frequently not equal to the target exposure index (EIT). Only 34% of images had DI within the range - 1.0 to + 1.0.Report abuse »
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