Purpose
To evaluate the Exposure Index (EI) of two different systems of digital radiology,
Kodak and Fujifilm,
compare it with the manufacturers standards and verify the image exposure conditions.
Methods and materials
A total sample of 800 radiographs was collected (400 from each system 1and 2) in two different conventional radiology departments of public hospital.
4 different anatomical regions were considered (chest,
spine,
abdomen and extremities) and a sample of 100 examination for each anatomical region were examinated by the investigator.
The following technical parameters were recorded for each radiograph using structured observation grids: exposure index,
voltage,
current-time product,
dose-area product,
use or not of anti-scatter grid and focus image distance.
Statistical analysis and correlation tests between...
Results
Most of the radiographs were considered above the standards (underexposed) for both systems.
With the system 1 and comparing with manufacturers standards we obtained that 92% of the radiographs were underexposed for the chest examinations with anti-scatter grid,
84% for the chest without anti-scatter grid,
75% for the abdomen,
94% for the spine and 66% for the extremities(Fig. 2).
Using r Pearson correlation coefficient a statistical significance correlation between exposition and exposition index and independent variables was verified.
We obtained weak correlation between exposure,
exposure...
Conclusion
Most of radiographs produced in this general radiology departments were considered underexposed according to a manufacturer recommendations.
However they presented high image quality and can be used for diagnostic porpuse.
The parameters as voltage,
current-time product,
dose-area product,
use or not of anti-scatter grid and focus image distances,
any factors can influence exposure,
so during the general radiology procedures all this factors have to be considered to ensure image quality and to serve it purpuse.
The Exposure Index is an important tool in patient radioprotection,...
Personal information
Luís Ribeiro (PhD),
Professor in the Medical Imaging and Radiotherapy Department,
Health School - University of Algarve,
Portugal.
Researcher in CIDAF – University of Coimbra (Centro de Investigação do Desporto e da Atividade Física) and Member of Studies Center in Healthcare (CES-ESSUALG).
E-mail:
[email protected]
Joana Ribeiro(BSc),
Collaborator in the Medical Imaging and Radiotherapy Department,
Health School - University of Algarve,
Portugal.
E-mail:
[email protected]
Rui Almeida (MSc),
Professor in the Medical Imaging and Radiotherapy Department,
Health School - University of Algarve,
Portugal.
Radiographer in Centro Hospitalar do...
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