Evaluation of Computer Aided Volumetry for Simulated Small Pulmonary Nodules on Computed Tomography .
10.3348/jkrs.2004.50.2.101
- Author:
Kyung Hyun DO
;
Myung Jin CHUNG
;
Jin Mo GOO
;
Kyung Won LEE
;
Jung Gi IM
- Publication Type:Original Article
- Keywords:
Computed tomography (CT), computer programs;
Lung, nodule;
Lung neoplasms, CT
- MeSH:
Cone-Beam Computed Tomography;
Seoul
- From:Journal of the Korean Radiological Society
2004;50(2):101-108
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To determine the accuracy of automated computer aided volumetry for simulated small pulmonary nodules at computed tomography using various types of phantoms MATERIALS AND METHODS: Three sets of synthetic nodules (small, calcified and those adjacent to vessels) were studied. The volume of the nodules in each set was already known, and using multi-slice CT, volumetric data for each nodule was acquired from the three-dimensional reconstructed image. The volume was calculated by applying three different threshold values using Rapidia(R) software (3D-Med, Seoul, Korea). RESULTS: Relative errors in the measured volume of synthetic pulmonary nodules were 17.3, 2.9, and 11.5% at -200, -400, and -600 HU, respectively, and there was good correlation between true volume and measured volume at -400 HU (r=0.96, p<0.001). For calcified nodules, relative errors in measured volume were 10.9, 5.3, and 16.5% at -200, -400, and -600 HU, respectively, and there was good correlation between true volume and measured volume at -400 HU (r=1.03, p<0.001). In cases involving synthetic nodules adjacent to vessels, relative errors were 4.6, 16.3, and 31.2 % at -200, -400, and -600 HU, respectively. There was good correlation between true volume and measured volume at -200 HU (r=1.1, p<0.001). CONCLUSION: Using computer-aided volumetry, the measured volumes of synthetic nodules correlated closely with their true volume. Measured volumes were the same at each threshold level, regardless of window setting.
