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Radiation Protection Dosimetry 2005 114(1-3):114-120; doi:10.1093/rpd/nch574
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Nodule detection in digital chest radiography: summary of the RADIUS chest trial

Markus Håkansson1,*, Magnus Båth1, Sara Börjesson1, Susanne Kheddache2, Anna Grahn3, Mark Ruschin3, Anders Tingberg3, Sören Mattsson3 and Lars Gunnar Månsson1

1 Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, SE-413 45 Göteborg, Sweden
2 Department of Radiology, Sahlgrenska University Hospital, SE-413 45 Göteborg, Sweden
3 Department of Medical Radiation Physics, Malmö University Hospital, SE-205 02 Malmö, Sweden

* Corresponding author: markus.hakansson{at}vgregion.se

As a part of the Europe-wide research project ‘Unification of physical and clinical requirements for medical X-ray imaging’—governed by the Radiological Imaging Unification Strategies (RADIUS) Group—a major image quality trial was conducted by members of the group. The RADIUS chest trial aimed at thoroughly examining various aspects of nodule detection in digital chest radiography, such as the effects of nodule location, system noise, anatomical noise, and anatomical background. The main findings of the RADIUS chest trial concerning the detection of a lung nodule with a size in the order of 10 mm can be summarised as: (1) the detectability of the nodule is largely dependent on its location in the chest, (2) the system noise has a minor impact on the detectability at the dose levels used today, (3) the disturbance of the anatomical noise is larger than that of the system noise but smaller than that of the anatomical background and (4) the anatomical background acts as noise to a large extent and is the major image component affecting the detectability of the nodule.


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