Construction and validation of a low cost paediatric pelvis phantom

Ali Mohammed Ali, Peter Hogg, Safora Johansen, Andrew England

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)84-91
Number of pages8
JournalEuropean Journal of Radiology
Volume108
DOIs
StatePublished - Nov 2018

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Pelvis
Polymethyl Methacrylate
Pediatrics
Costs and Cost Analysis
Signal-To-Noise Ratio
Psychometrics
Anatomy
Imaging Phantoms
X-Rays
Calcium Sulfate
Bone and Bones
Reproducibility of Results

Keywords

  • Development
  • Dose optimisation
  • Low-cost
  • Pelvis phantom
  • Validation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Construction and validation of a low cost paediatric pelvis phantom. / Mohammed Ali, Ali; Hogg, Peter; Johansen, Safora; England, Andrew.

In: European Journal of Radiology, Vol. 108, 11.2018, p. 84-91.

Research output: Contribution to journalArticle

Mohammed Ali, Ali ; Hogg, Peter ; Johansen, Safora ; England, Andrew. / Construction and validation of a low cost paediatric pelvis phantom. In: European Journal of Radiology. 2018 ; Vol. 108. pp. 84-91.
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