Table 1.

Second generation anatomic 3D modeling QA phantom. Specific test objects and their dimensions are described and are also illustrated in Fig. 13

Test object	Test	Dimensions
Line pair pattern	Spatial resolution	Line pairs(lp) at 0.5, 1.0, and 2.0 lp/mm along each physical axis
Concave/Convex surface	Curvilinear surface accuracy	Height-7.5 mm Length-50 mm Width-12.5 mm Depth-10.0 mm
Spheres	Shape fidelity	Semi spheres at diameters of 2.5 mm, 5.0 mm, and 7.5 mm
Cones	Shape fidelity	Positive cone: Bottom diameter-20 mm Top diameter-10 mm Height-20 mm Negative cone: Top diameter-16.5 mm Bottom diameter-10 mm Height-7.5 mm
Hexagonal Cylinder	Rectilinear geometric accuracy	Width-10 mm Height-20 mm
Positive base	Volumetric accuracy & temporal stability	Width-50 mm Length-100 mm Height-5 mm
Negative base	Volumetric accuracy & temporal stability	Width-50 mm Length-100 mm Height-12.5 mm
Ruler	Spatial accuracy	Five markers placed at 10 mm spacing along physical X and Y edges of phantom on negative base.
Spiral	Anatomic	Inner diameter-1.8 mm Outer diameter-2.5 mm Spiral start-end separation-10 mm
Vascular tree	Anatomic	Cylinders of uniform length of 10 mm with diameters of 5 mm, 2.5 mm, 1.25 mm, 0.75 mm and 0.5 mm. Two outer branches at diameters of 2.5 mm and 0.75 mm placed at 45° and 25° respectively to the inner cylinders.