Journal of applied clinical medical physics · 2021
Variation in thyroid volumes due to differences in the measured length or area of the cross-sectional plane: A validation study of the ellipsoid approximation method using CT images.
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Fujita Naotoshi, Kato Katsuhiko, Abe Shinji, Naganawa Shinji
Аннотация
PURPOSE: This study examined the variation in the thyroid volume determined by the ellipsoid approximation method due to differences in the measured length or area of the cross-sectional plane of CT images.
METHODS: Forty-five patients with Graves' disease were included in this retrospective study. We designated the three-dimensional thyroid volumes extracted manually (VCT ) as the reference data and calculated five approximate volumes for comparison: (a) the mean volume of 8100 different thyroid volumes depending on the diameter of the cross-sectional plane at the midpoint of the major axis, (Vellipsoid,mean ); (b) the volume using the maximum diameter and its orthogonal diameter, (Vellipsoid,maxlength ); (c) the maximum (Vellipsoid,maxvolume ); (d) minimum (Vellipsoid,minvolume ) of the 8100 thyroid volumes; and (e) the volume determined with an equivalent circle diameter, (Vellipsoid,Heywood ).
RESULTS: Thyroid volumes obtained via the ellipsoid approximation method varied depending on the diameter of the cross-sectional plane and included a mean error of approximately 20%, while the concordance correlation coefficient (CCC) differed for each approximate volume. Among these volumes, Vellipsoid,mean and Vellipsoid,Heywood were in good agreement with VCT , according to single regression analyses and the resultant CCC values, with mean errors of 0.1% and 10.4%, respectively.
CONCLUSION: While Vellipsoid,Heywood approximated thyroid volumes with vastly reduced errors, we recommend utilizing three-dimensional thyroid volumetry if measurement accuracy is required.
METHODS: Forty-five patients with Graves' disease were included in this retrospective study. We designated the three-dimensional thyroid volumes extracted manually (VCT ) as the reference data and calculated five approximate volumes for comparison: (a) the mean volume of 8100 different thyroid volumes depending on the diameter of the cross-sectional plane at the midpoint of the major axis, (Vellipsoid,mean ); (b) the volume using the maximum diameter and its orthogonal diameter, (Vellipsoid,maxlength ); (c) the maximum (Vellipsoid,maxvolume ); (d) minimum (Vellipsoid,minvolume ) of the 8100 thyroid volumes; and (e) the volume determined with an equivalent circle diameter, (Vellipsoid,Heywood ).
RESULTS: Thyroid volumes obtained via the ellipsoid approximation method varied depending on the diameter of the cross-sectional plane and included a mean error of approximately 20%, while the concordance correlation coefficient (CCC) differed for each approximate volume. Among these volumes, Vellipsoid,mean and Vellipsoid,Heywood were in good agreement with VCT , according to single regression analyses and the resultant CCC values, with mean errors of 0.1% and 10.4%, respectively.
CONCLUSION: While Vellipsoid,Heywood approximated thyroid volumes with vastly reduced errors, we recommend utilizing three-dimensional thyroid volumetry if measurement accuracy is required.