Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/5024
Título: A comparison of Sinogram Affirmed Iterative Reconstruction and filtered back projection on image quality and dose reduction in paediatric head CT: a phantom study
Autor: Ahmed, Abdulfatah
Garcia, André
Bakker, Astrid
Tomkinson, David
Salamin, Julie
de Lange, René
Buyvidovich, Serguey A.
Sohrabi, Tina
Dominguez, Alexandre
Campeanu, Cosmin
Plasman, Paul
Palavras-chave: Sinogram-affirmed iterative reconstruction
Filtered back projection
Dose reduction
Paediatric patients
Computed tomography
Image quality
Data: 2015
Editora: Open Source, University of Salford
Citação: Ahmed A, Garcia A, Bakker A, Tomkinson D, Salamin J, Lange R, et al. A comparison of sinogram affirmed iterative reconstruction and filtered back projection on image quality and dose reduction in paediatric head CT: a phantom 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. 27-36.
Resumo: Background: Computed tomography (CT) is one of the most used modalities for diagnostics in paediatric populations, which is a concern as it also delivers a high patient dose. Research has focused on developing computer algorithms that provide better image quality at lower dose. The iterative reconstruction algorithm Sinogram-Affirmed Iterative Reconstruction (SAFIRE) was introduced as a new technique that reduces noise to increase image quality. Purpose: The aim of this study is to compare SAFIRE with the current gold standard, Filtered Back Projection (FBP), and assess whether SAFIRE alone permits a reduction in dose while maintaining image quality in paediatric head CT. Methods: Images were collected using a paediatric head phantom using a SIEMENS SOMATOM PERSPECTIVE 128 modulated acquisition. 54 images were reconstructed using FBP and 5 different strengths of SAFIRE. Objective measures of image quality were determined by measuring SNR and CNR. Visual measures of image quality were determined by 17 observers with different radiographic experiences. Images were randomized and displayed using 2AFC; observers scored the images answering 5 questions using a Likert scale. Results: At different dose levels, SAFIRE significantly increased SNR (up to 54%) in the acquired images compared to FBP at 80kVp (5.2-8.4), 110kVp (8.2-12.3), 130kVp (8.8-13.1). Visual image quality was higher with increasing SAFIRE strength. The highest image quality was scored with SAFIRE level 3 and higher. Conclusion: The SAFIRE algorithm is suitable for image noise reduction in paediatric head CT. Our data demonstrates that SAFIRE enhances SNR while reducing noise with a possible reduction of dose of 68%.
Peer review: yes
URI: http://hdl.handle.net/10400.21/5024
ISBN: 9781907842603
Versão do Editor: http://usir.salford.ac.uk/34439/
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