Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/5026
Título: Optimisation of paediatrics computed radiography for full spine curvature measurements using a phantom: a pilot study
Autor: Reis, Cláudia
Ndlovu, Junior
Serrenho, Catarina
Akhtar, Ifrah
de Haan, Seraphine
Garcia, José António
de Linde, Daniel
Thorskog, Martine
Franco, Loris
Lança, Carla Costa
Hogg, Peter
Palavras-chave: Optimisation
Spinal curvature measurements
Paediatric patients
Effective dose
Image quality
Computed tomography
Phantom
Data: 2015
Editora: Open Source, University of Salford
Citação: Reis CS, Ndlovu J, Serrenho C, Akhtar I, de Haan S, Lança CC, et al. Optimisation of paediatrics computed radiography for full spine curvature measurements using a phantom: a pilot study. In Hogg P, Lança L, editors. OPTIMAX 2014 – Radiation dose and image quality optimisation in medical imaging. Salford, UK: Open Source, University of Salford; 2015. p. 43-51.
Resumo: Aim: Optimise a set of exposure factors, with the lowest effective dose, to delineate spinal curvature with the modified Cobb method in a full spine using computed radiography (CR) for a 5-year-old paediatric anthropomorphic phantom. Methods: Images were acquired by varying a set of parameters: positions (antero-posterior (AP), posteroanterior (PA) and lateral), kilo-voltage peak (kVp) (66-90), source-to-image distance (SID) (150 to 200cm), broad focus and the use of a grid (grid in/out) to analyse the impact on E and image quality (IQ). IQ was analysed applying two approaches: objective [contrast-to-noise-ratio/(CNR] and perceptual, using 5 observers. Monte-Carlo modelling was used for dose estimation. Cohen’s Kappa coefficient was used to calculate inter-observer-variability. The angle was measured using Cobb’s method on lateral projections under different imaging conditions. Results: PA promoted the lowest effective dose (0.013 mSv) compared to AP (0.048 mSv) and lateral (0.025 mSv). The exposure parameters that allowed lower dose were 200cm SID, 90 kVp, broad focus and grid out for paediatrics using an Agfa CR system. Thirty-seven images were assessed for IQ and thirty-two were classified adequate. Cobb angle measurements varied between 16°±2.9 and 19.9°±0.9. Conclusion: Cobb angle measurements can be performed using the lowest dose with a low contrast-tonoise ratio. The variation on measurements for this was ±2.9° and this is within the range of acceptable clinical error without impact on clinical diagnosis. Further work is recommended on improvement to the sample size and a more robust perceptual IQ assessment protocol for observers.
Peer review: yes
URI: http://hdl.handle.net/10400.21/5026
ISBN: 9781907842603
Versão do Editor: http://usir.salford.ac.uk/34439/
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