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Accuracy of Automated CT Angiography Measurement of Vascular Diameter in Phantoms: Effect of Size of Display Field of View, Density of Contrast Medium, and Wall Thickness

Department of Radiology, Teikyo University School of Medicine, 2-11-1, Kaga, Itabashi-ku, Tokyo 173-8605, Japan.

View larger version (44K): [in a new window]   Fig. 1. —Schema shows phantom. The phantom was composed of nine cylinders made of ethylene-vinyl alcohol copolymer with a 0.5-, 0.8-, or 1.0-mm-thick wall and was filled with contrast medium of three dilutions. Nine cylinders were fixed in a columnar styrene container that was filled with salad oil. The cylinders were placed parallel to the central axis of the styrene container. The styrene container was fixed in a water-filled columnar polyethylene container with the central axes overlapping.

View larger version (33K): [in a new window]   Fig. 2A. —Images show cross sections (top) and graphs show CT attenuation profiles (bottom) of models. Circles on cross sections correspond to contour recognized by automated software. Straight lines inside circle correspond to minimal and maximal diameters in cross section. Increments of attenuation profile curve are 1 mm. Models that have 0.8-mm-thick wall and are filled with contrast medium of intermediate density (270 H) are shown in 20-cm (A), 15-cm (B), and 10-cm (C) display fields of view.

View larger version (33K): [in a new window]   Fig. 2B. —Images show cross sections (top) and graphs show CT attenuation profiles (bottom) of models. Circles on cross sections correspond to contour recognized by automated software. Straight lines inside circle correspond to minimal and maximal diameters in cross section. Increments of attenuation profile curve are 1 mm. Models that have 0.8-mm-thick wall and are in 15-cm display field of view are shown filled with 350-H (A), 270-H (B), and 198-H (C) contrast material.

View larger version (34K): [in a new window]   Fig. 2C. —Images show cross sections (top) and graphs show CT attenuation profiles (bottom) of models. Circles on cross sections correspond to contour recognized by automated software. Straight lines inside circle correspond to minimal and maximal diameters in cross section. Increments of attenuation profile curve are 1 mm. Models that are filled with contrast medium of intermediate density (270 H) and are in 20-cm display field of view are shown with wall thickness of 1.0 mm (A), 0.8 mm (B), and 0.5 mm (C).

View larger version (23K): [in a new window]   Fig. 3A. —Bar graphs show effect of wall thickness of vascular model and density of intravascular contrast medium on overall measurement error for three display fields of view. Bars from left to right in each group indicate models with 0.5-, 0.8-, and 1.0-mm-thick wall. Bar graphs show measurement error results for 10-cm (A), 15-cm (B), and 20-cm (C) display fields of view.

View larger version (29K): [in a new window]   Fig. 3B. —Bar graphs show effect of wall thickness of vascular model and density of intravascular contrast medium on overall measurement error for three display fields of view. Bars from left to right in each group indicate models with 0.5-, 0.8-, and 1.0-mm-thick wall. Bar graphs show measurement error results for 10-cm (A), 15-cm (B), and 20-cm (C) display fields of view.

View larger version (31K): [in a new window]   Fig. 3C. —Bar graphs show effect of wall thickness of vascular model and density of intravascular contrast medium on overall measurement error for three display fields of view. Bars from left to right in each group indicate models with 0.5-, 0.8-, and 1.0-mm-thick wall. Bar graphs show measurement error results for 10-cm (A), 15-cm (B), and 20-cm (C) display fields of view.

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