Relationship between body habitus and image quality and radiation dose in chest x-ray examinations : a phantom study

Al-Murshedi, SHM, Hogg, P ORCID: https://orcid.org/0000-0002-6506-0827 and England, A ORCID: https://orcid.org/0000-0001-6333-7776 2018, 'Relationship between body habitus and image quality and radiation dose in chest x-ray examinations : a phantom study' , Physica Medica : European Journal of Medical Physics, 57 (Jan 19) , pp. 65-71.

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Abstract

Purpose: To evaluate the influence of being overweight on image quality (IQ), radiation dose and acquisition parameters when undertaking adult chest x-ray (CXR) examinations using routine acquisition protocols.

Methods: The Lungman chest phantom, with and without chest plates, was used to simulate the chest region for larger size and average adult patients, respectively. Radiographic acquisitions were conducted using 17 x-ray machines located in eight hospitals using their routine clinical protocols. IQ was assessed using relative visual grading analysis (VGA) and 2 alternative forced choice (2AFC) by six observers. Incident air kerma (IAK) was measured using a solid-state dosimeter.

Results: IQ mean (range) scores between the hospitals were 16.2 (12.0 to 21.3) with a 56.0% difference and 20.9 (14.1 to 23.6) with a 50.2% difference for the standard and larger size phantoms, respectively. IAK mean (range) scores 63.38 μGy (19.28 to 136.29 μGy) with a 150.40% difference and 159.20 μGy (27.43 to 384.73 μGy) with a 173.4% difference for the standard and larger size phantoms, respectively. The chest plates had a significant negative impact on IQ (P=0.001) and lead to an increased in IAK by approximately 50.0%.

Conclusion: Visual measures of IQ and IAK showed large differences between hospitals for standard and larger phantom sizes; differences within the hospitals was lower. Overall, Lungman with chest plates was found to degrade IQ and increase radiation dose by a factor of two. Further optimisation is required especially for the larger sized patient's imaging protocols for all eight hospitals.

Item Type: Article
Schools: Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title: Physica Medica : European Journal of Medical Physics
Publisher: Elsevier
ISSN: 1120-1797
Related URLs:
Depositing User: Dr Andrew England
Date Deposited: 13 Dec 2018 13:59
Last Modified: 03 Feb 2019 04:00
URI: http://usir.salford.ac.uk/id/eprint/49516

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