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CT Angiography

In Vitro Comparison of Five Reconstruction Methods

¹ College of Medicine, Penn State University, Hershey, PA 17033.
² Department of Radiology, H066, Penn State University, P. O. Box 850, Hershey, PA 17033.
³ Department of Health Evaluation Sciences, A210, Penn State University, Hershey, PA 17033.

View larger version (66K): [in a new window]   Fig. 1. —For volume rendering, all measurements were made from inside of one vessel wall to inside of opposite wall (arrow).

View larger version (55K): [in a new window]   Fig. 2A. —This example from our study (stenosis diameter, 4.0 mm; diameter of normal vessel lumen on each side of stenosis, 8.0 mm; stenosis length, 10.0 mm) was reconstructed by each of five techniques studied. CT angiography images of the same vessel using axial (perpendicular to vessel lumen) (A), maximum-intensity-projection (B), multiplanar reconstruction (C), shaded-surface display (D), and volume-rendering (E) techniques. Sample measurements are included on each image.

View larger version (76K): [in a new window]   Fig. 2B. —This example from our study (stenosis diameter, 4.0 mm; diameter of normal vessel lumen on each side of stenosis, 8.0 mm; stenosis length, 10.0 mm) was reconstructed by each of five techniques studied. CT angiography images of the same vessel using axial (perpendicular to vessel lumen) (A), maximum-intensity-projection (B), multiplanar reconstruction (C), shaded-surface display (D), and volume-rendering (E) techniques. Sample measurements are included on each image.

View larger version (85K): [in a new window]   Fig. 2C. —This example from our study (stenosis diameter, 4.0 mm; diameter of normal vessel lumen on each side of stenosis, 8.0 mm; stenosis length, 10.0 mm) was reconstructed by each of five techniques studied. CT angiography images of the same vessel using axial (perpendicular to vessel lumen) (A), maximum-intensity-projection (B), multiplanar reconstruction (C), shaded-surface display (D), and volume-rendering (E) techniques. Sample measurements are included on each image.

View larger version (100K): [in a new window]   Fig. 2D. —This example from our study (stenosis diameter, 4.0 mm; diameter of normal vessel lumen on each side of stenosis, 8.0 mm; stenosis length, 10.0 mm) was reconstructed by each of five techniques studied. CT angiography images of the same vessel using axial (perpendicular to vessel lumen) (A), maximum-intensity-projection (B), multiplanar reconstruction (C), shaded-surface display (D), and volume-rendering (E) techniques. Sample measurements are included on each image.

View larger version (105K): [in a new window]   Fig. 2E. —This example from our study (stenosis diameter, 4.0 mm; diameter of normal vessel lumen on each side of stenosis, 8.0 mm; stenosis length, 10.0 mm) was reconstructed by each of five techniques studied. CT angiography images of the same vessel using axial (perpendicular to vessel lumen) (A), maximum-intensity-projection (B), multiplanar reconstruction (C), shaded-surface display (D), and volume-rendering (E) techniques. Sample measurements are included on each image.

View larger version (19K): [in a new window]   Fig. 3. —Box plot displays absolute error (in millimeters) for five optimized reconstruction techniques for each vessel diameter. Each box encloses middle 50% of data points (i.e., from first quartile to third). Median is marked by horizontal line in each box. Lines extend above and below each box to most extreme data point not more than 1.5 times interquartile range from edge of box. Data points farther from box are individually marked. MIP = maximum intensity projection, MPR = multiplanar reconstruction, SSD = shaded-surface display.

View larger version (20K): [in a new window]   Fig. 4. —Box plot displays absolute error (in millimeters) for vessel diameters for each optimized reconstruction technique. AX = axial, MIP = maximum intensity projection, MPR = multiplanar reconstruction, SSD = shaded-surface display, Vol = volume rendering.

View larger version (16K): [in a new window]   Fig. 5. —Chart displays comparison of five reconstruction methods at various vessel diameters and shows standard error for each. MPR = multiplanar reconstruction, MIP = maximum intensity projection, SSD = shaded-surface display, Vol Rend = volume rendering.

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