Construction and validation of a low cost paediatric pelvis phantom

Ali, M, Hogg, P ORCID: https://orcid.org/0000-0002-6506-0827, Johansen, S and England, A ORCID: https://orcid.org/0000-0001-6333-7776 2018, 'Construction and validation of a low cost paediatric pelvis phantom' , European Journal of Radiology, 108 , pp. 84-91.

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Abstract

PURPOSE: Imaging phantoms can be cost prohibitive, therefore a need exists to produce low cost alternatives which are fit for purpose. This paper describes the development and validation of a low cost paediatric pelvis phantom based on the anatomy of a 5-year-old child.
METHODS: Tissue equivalent materials representing paediatric bone (Plaster of Paris; PoP) and soft tissue (Poly methyl methacrylate; PMMA) were used. PMMA was machined to match the bony anatomy identified from a CT scan of a 5-year-old child and cavities were created for infusing the PoP. Phantom validation comprised physical and visual measures. Physical included CT density comparison between a CT scan of a 5-year old child and the phantom and Signal to Noise Ratio (SNR) comparative analysis of anteroposterior phantom X-ray images against a commercial anthropomorphic phantom. Visual analysis using a psychometric image quality scale (face validity).
RESULTS: CT density, the percentage difference between cortical bone, soft tissue and their equivalent tissue substitutes were -4.7 to -4.1% and -23.4%, respectively. For SNR, (mAs response) there was a strong positive correlation between the two phantoms (r>0.95 for all kVps). For kVp response, there was a strong positive correlation between 1 and 8 mAs (r=0.85), this then decreased as mAs increased (r=-0.21 at 20 mAs). Psychometric scale results produced a Cronbach’s Alpha of almost 0.8.
CONCLUSIONS: Physical and visual measures suggest our low-cost phantom has suitable anatomical characteristics for X-ray imaging. Our phantom could have utility in dose and image quality optimisation studies.

Keywords: Pelvis phantom, low-cost, dose optimisation, validation, development.

Item Type: Article
Schools: Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title: European Journal of Radiology
Publisher: Elsevier
ISSN: 0720-048X
Related URLs:
Depositing User: P Hogg
Date Deposited: 19 Sep 2018 09:38
Last Modified: 20 Nov 2019 11:01
URI: http://usir.salford.ac.uk/id/eprint/48400

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