The main objective is to optimize MRI acquisition and image post-processing protocols in order to define the best compromise between short scan time and image quality (contrast between different tissues, spatial and temporal resolutions) high enough to accurately measure morphologic, hemodynamic and structural aortic biomarkers.
This Magnetic Resonance imaging study of the thoracic aorta aims to: 1- enhance patient comfort during the examination, shorten appointment waiting times and overall reduce MRI cost, and 2- provide a reliable diagnosis and risk assessment of aorta-related diseases occurring in hypertension, obesity or diabetes but also throughout normal aging. The impact of MRI acquisition innovations on the measurement of biomarkers that are extracted from image post-processing software and therein on disease characterization (normal values, severity thresholds, etc.) must be systematically reevaluated. More specifically, the investigators design image acquisition and automated image processing methods to reduce operator variability. This study will optimize thoracic aortic MRI acquisition sequences for the quantification of diagnostic-assisting biomarkers in a healthy population.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
60
Non-injected thoracic aorta MRI calibration
Hôpital de la Pitié Salpêtrière
Paris, France
Parametric measurement of thoracic aorta values of normal subjects
Thoracic aorta values measured by MRI
Time frame: 24 months
Quantitative fibrosis within the aortic wall (%)
Time frame: 24 months
Quantitative fat within the aortic wall (%)
Time frame: 24 months
Quantitative periaortic fat (g and g/m², when indexed to BSA)
Time frame: 24 months
ROC metrics will be used to compare the various sequences (%)
Time frame: 24 months
Quantitative flow values within the different aortic segments and the main branches (mL)
Time frame: 24 months
Correlation coefficients will be estimated to assess the associations between novel and conventional biomarkers
Time frame: 24 months
Intra and inter-reproductibility of aortic measures will be assessed (intra-class correlation coefficients)
Time frame: 24 months
Intra and inter-reproductibility of aortic measures will be assessed (Bland and Altman metrics)
Time frame: 24 months
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