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This paper presents the features and capabilities of a vertical axis wind turbine (VAWT) designed and built by the authors, which is meant to be the reference machine for open data code validation purposes under the project VODCA, VAWT Open Data for Code Assessment.
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These tests were conducted in a 1.5 Tesla MRI scan (Gyroscan ACS-NT; Philips, Best, the Netherlands), which was named the "reference machine" because it was the equipment in which our model for LIC quantification was developed.
The repeatability of the measurements was evaluated with eight subjects with different LICs (a volunteer with normal iron metabolism, six patients with primary hemochromatosis, and one with posttransfusional iron overload) being analyzed twice in the reference machine.
The reference machine is always working overtime in Milan.
Agreement between the estimated LIC for both the tubes and the subjects in the four machines tested and the reference machine was assessed using the Bland-Altman method.
The variability of the measurements in the phantom of all the analyzed machines with respect to the reference machine was also very low.
Diagnostic concordance (no overload, moderate and high iron overload) between the four machines tested and the reference machine was assessed using Cohen's unweighted kappa.
The variability in the 14 measurements of the phantom made in the reference machine was also very low, with a coefficient of variation between 0.02 and 0.09.
The variability of all machines analyzed with respect to the reference machine was low, ranging from 0 to 28%, with a mean difference of 8% in patients with iron overload.
The repeatability of the phantom was tested once a week for 14 weeks in the reference machine.
The phantom was analysed in the same equipment and 14 times in the reference machine.
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