Incident air kerma to absorbed organ dose conversion factors for breast and lung in PA thorax radiography: The effect of patient thickness and radiation quality.

Kelaranta, A; Toroi, P; Vock, Peter (2016). Incident air kerma to absorbed organ dose conversion factors for breast and lung in PA thorax radiography: The effect of patient thickness and radiation quality. Physica medica, 32(12), pp. 1594-1601. Elsevier 10.1016/j.ejmp.2016.11.113

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PURPOSE Converting the measurable quantities to patient organ doses in projection radiography is usually based on a standard-sized patient model and a specific radiation quality, which are likely to differ from the real situation. Large inaccuracies can therefore be obtained in organ doses, because organ doses are dependent on the exposure parameters, exposure geometry and patient anatomy. In this study, the effect of radiation quality and patient thickness on the organ dose conversion factors were determined. METHODS In this study, the posterior-anterior projection radiograph of the thorax was selected in order to determine the effect of radiation quality (tube voltages of 70-130kV and total filtrations of 3mmAl to 4mmAl+0.2 mmCu) and patient thickness (anterior-posterior thicknesses of 19.4-30.8cm) on the breast and lung dose conversion factors. For this purpose, Monte Carlo simulation programs ImpactMC and PCXMC were used with computed tomography examination data of adult male and female patients and mathematical hermaphrodite phantoms, respectively. RESULTS Compared to the reference beam quality and patient thickness, the relative variation range in organ dose conversion factors was up to 74% for different radiation qualities and 122% for different patient thicknesses. CONCLUSIONS Conversion factors should only be used with comprehensive understanding of the exposure conditions, considering the exposure parameters, exposure geometry and patient anatomy they are valid for. This study demonstrates that patient thickness-specific and radiation quality-specific conversion factors are needed in projection radiography.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology

UniBE Contributor:

Vock, Peter

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1724-191X

Publisher:

Elsevier

Language:

English

Submitter:

Karin Hofmann

Date Deposited:

24 Apr 2017 07:54

Last Modified:

01 Jan 2018 02:36

Publisher DOI:

10.1016/j.ejmp.2016.11.113

PubMed ID:

27914781

Uncontrolled Keywords:

Conversion factor; Organ dose; Patient thickness; Radiation quality; Thorax X-ray examination

BORIS DOI:

10.7892/boris.94139

URI:

https://boris.unibe.ch/id/eprint/94139

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