Statistical characterization of noise for spatial standardization of CT scans: Enabling comparison with multiple kernels and doses

• Published in: Medical image analysis Vol. 40; pp. 44 - 59
• Main Authors: Vegas-Sánchez-Ferrero, Gonzalo, Ledesma-Carbayo, Maria J., Washko, George R., San José Estépar, Raúl
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.08.2017; Elsevier BV
• Subjects: Algorithms; Biological activity; Biomarkers; Comparative analysis; Computed tomography; Computerized tomography; Devices; Image reconstruction; Information processing; Iterative methods; Kernels; Mathematical models; Noise; Noise propagation; Noise reduction; Non-stationary noise; Philosophy; Propagation; Scanners; Standardization; Statistical analysis; Statistical characterization; Tomography; Variance; Workflow; Non-stationary noise; Statistical characterization; Computerized tomography
• ISSN: 1361-8415; 1361-8423; 1361-8423
• DOI: 10.1016/j.media.2017.06.001

•We purpose a statistical characterization of noise in reconstructed CT scans that leads to a versatile statistical model that effectively characterizes different doses, reconstruction kernels, and devices.•The statistical model is generalized to deal with the partial volume effect via a localized mixture models that also describes the non-stationarity of noise.•A stabilization scheme is also proposed to achieve stationary variance that enables statistical comparison between CT scans acquired in different conditions.•The validation of the proposed methodology shows its suitability to enable statistical comparison of subjects acquired with different acquisition protocols. [Display omitted] Computerized tomography (CT) is a widely adopted modality for analyzing directly or indirectly functional, biological and morphological processes by means of the image characteristics. However, the potential utilization of the information obtained from CT images is often limited when considering the analysis of quantitative information involving different devices, acquisition protocols or reconstruction algorithms. Although CT scanners are calibrated as a part of the imaging workflow, the calibration is circumscribed to global reference values and does not circumvent problems that are inherent to the imaging modality. One of them is the lack of noise stationarity, which makes quantitative biomarkers extracted from the images less robust and stable. Some methodologies have been proposed for the assessment of non-stationary noise in reconstructed CT scans. However, those methods focused on the non-stationarity only due to the reconstruction geometry and are mainly based on the propagation of the variance of noise throughout the whole reconstruction process. Additionally, the philosophy followed in the state-of-the-art methods is based on the reduction of noise, but not in the standardization of it. This means that, even if the noise is reduced, the statistics of the signal remain non-stationary, which is insufficient to enable comparisons between different acquisitions with different statistical characteristics. In this work, we propose a statistical characterization of noise in reconstructed CT scans that leads to a versatile statistical model that effectively characterizes different doses, reconstruction kernels, and devices. The statistical model is generalized to deal with the partial volume effect via a localized mixture model that also describes the non-stationarity of noise. Finally, we propose a stabilization scheme to achieve stationary variance. The validation of the proposed methodology was performed with a physical phantom and clinical CT scans acquired with different configurations (kernels, doses, algorithms including iterative reconstruction). The results confirmed its suitability to enable comparisons with different doses, and acquisition protocols.