MBIRN: structural calibration dissemination-Phantom
- Overview of dissemination contents
- Multi-site phantom data: phantom that helps asses image distortions from gradient non-linearities
- Multi-site human data: healthy volunteers, most of which were scanned twice at the participating sites
- Human Protocol: multi-spectral 3D structural (FLASH with multiple flip angles: 30, 20, 5, 3 degrees)
- Sites: Five sites with different 1.5T systems (Siemens, GE, Philips/Picker)
- Phantom Description
A special cylindrical phantom (250mm length x 220mm diameter) consisting of 25 plastic plates, each 10 mm thick was specifically built for assessing geometric distortions from gradient non-linearities (Franz Schmitt, personal communication). Each plate had a pattern of holes 3 mm in diameter, going through the thickness of the plate and perpendicular to the faces of the plate. These holes formed a 2D rectangular grid with 10±0.05 mm spacing. In addition, on the two sides of each plate, each hole was enlarged with a half spherical depression of 7 mm in diameter. In this way, with the plates glued to each other and the 3 mm holes aligned, the phantom formed a 3D 10±0.05 mm grid of 7 mm diameter spheres that could be filled with a fluid (water doped with salt) through the passing 3 mm holes. The phantom acquisition protocol scan was as for the humans, but with 2mm slices and a 45 cm FOV.
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