Optimisation of chest Computed Tomography using a phantom: impact of mAs and reconstruction techniques on Image Quality

Objectives: To verify if the mAs and reconstruction techniques affect the visualisation of relevant structures in lung Computed Tomography (CT) using a phantom. Methods: Images were acquired using various mAs and reconstruction techniques. Image quality (IQ) was analysed applying two approaches: per...

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Bibliographic Details
Main Authors: Reis, Cláudia, Hårsaker, Vanja, Faqir, T, Kristoffersen, Linn, van Rein, I, Stancombe, K, Warmerdam, N.C, Wergeland, Christine
Format: Article
Language:English
Subjects:
Image Quality
Lungs CT
mAs
Optimisation
Reconstruction techniques
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Summary:Objectives: To verify if the mAs and reconstruction techniques affect the visualisation of relevant structures in lung Computed Tomography (CT) using a phantom. Methods: Images were acquired using various mAs and reconstruction techniques. Image quality (IQ) was analysed applying two approaches: perceptual, using 5 observers and objective (edge gradient calculation) to verify the sharpness of the structures. Dose was recorded. Wilcoxon Signed Rank test was used to compare the data from the perceptual image analysis. P -values were calculated (Bonferroni-Correction method) to compare reconstruction techniques and mAs. A Kappa Test with linear weighting was performed to calculate the level of agreement between observers.Results: The Wilcoxon-Signed-Rank-Test showed no significant difference between the reconstruction techniques tested (p