PURPOSE: To study inter- and intraobserver variability of volume measurements with a new, fast semi-automatic method and compare the results to a previously validated standard manual method for volume measurement. METHODS: Twenty abdominal computed tomographic angiography (CTA) datasets of patients with abdominal aortic aneurysms undergoing endovascular aneurysm repair (EVAR) were randomly selected from a clinical database (10 pre and 10 post EVAR). Aneurysm sac volume was measured by 2 independent observers using both the standard and semi-automatic methods. Intra- and interobserver variabilities and variability between the 2 methods were studied. Differences of each pair of measurements were plotted against their mean, and the repeatability coefficient (RC) was calculated according to Bland and Altman. RESULTS: For the standard method, the intraobserver mean difference was 0.9 mL (0.4% of the first measurement), with an RC of 8.4 mL (4.2%); the interobserver mean difference was 0.0 mL (0.0%), with a RC of 11.8 mL (5.9%). For the semi-automatic method, the intraobserver mean difference was 1.4 mL (0.7%), with an RC of 7.8 mL (4.1%); the interobserver mean difference was -1.8 mL (-1.0%), with an RC of 10.8 mL (5.7%). The mean difference between the methods was 8.3 mL (4.2%), with an RC of 25.1 mL (12.6%) for observer 1, and a mean difference of 6.4 mL (3.2%) and an RC of 21.3 mL (10.7%) for observer 2. CONCLUSION: The semi-automatic method showed good intra- and interobserver variability for volume measurements of aortic aneurysms before and after EVAR. Volume measurements with the semi-automatic method correspond to measurements with the standard method. Sophisticated and fast postprocessing software may facilitate acceptance and clinical application of volume measurements in daily practice. The cutoff of 5% for relevant volume changes during follow-up, as advised in the reporting standards for EVAR, is sustained.
PURPOSE: To study inter- and intraobserver variability of volume measurements with a new, fast semi-automatic method and compare the results to a previously validated standard manual method for volume measurement. METHODS: Twenty abdominal computed tomographic angiography (CTA) datasets of patients with abdominal aortic aneurysms undergoing endovascular aneurysm repair (EVAR) were randomly selected from a clinical database (10 pre and 10 post EVAR). Aneurysm sac volume was measured by 2 independent observers using both the standard and semi-automatic methods. Intra- and interobserver variabilities and variability between the 2 methods were studied. Differences of each pair of measurements were plotted against their mean, and the repeatability coefficient (RC) was calculated according to Bland and Altman. RESULTS: For the standard method, the intraobserver mean difference was 0.9 mL (0.4% of the first measurement), with an RC of 8.4 mL (4.2%); the interobserver mean difference was 0.0 mL (0.0%), with a RC of 11.8 mL (5.9%). For the semi-automatic method, the intraobserver mean difference was 1.4 mL (0.7%), with an RC of 7.8 mL (4.1%); the interobserver mean difference was -1.8 mL (-1.0%), with an RC of 10.8 mL (5.7%). The mean difference between the methods was 8.3 mL (4.2%), with an RC of 25.1 mL (12.6%) for observer 1, and a mean difference of 6.4 mL (3.2%) and an RC of 21.3 mL (10.7%) for observer 2. CONCLUSION: The semi-automatic method showed good intra- and interobserver variability for volume measurements of aortic aneurysms before and after EVAR. Volume measurements with the semi-automatic method correspond to measurements with the standard method. Sophisticated and fast postprocessing software may facilitate acceptance and clinical application of volume measurements in daily practice. The cutoff of 5% for relevant volume changes during follow-up, as advised in the reporting standards for EVAR, is sustained.
Authors: Sebastian Fernandez-Alonso; Esther Martinez-Aguilar; Susana Ravassa; Josune Orbe; Jose A Paramo; Leopoldo Fernandez-Alonso; Carmen Roncal Journal: Life (Basel) Date: 2022-05-31
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Authors: Joe F Juffermans; Jos J M Westenberg; Pieter J van den Boogaard; Arno A W Roest; Hans C van Assen; Roel L F van der Palen; Hildo J Lamb Journal: J Magn Reson Imaging Date: 2020-11-11 Impact factor: 4.813