The design criteria for the Magphan® phantoms are based on physicist Dr. David Goodenough&s extensive experience with MRI system evaluation and his well documented research into the quantification of image system performance tests. The test objects that make up the current Magphan® models embody two decades of scientific evaluation and field experience.
The Magphan®&s patented spherical design combines precise alignment of spherical geometry with cubic geometry. As magnetic field characteristics are mapped according to spherical harmonics natural magnetic fields extend to diagonally symmetric volumes (DSVs) or spheres. This symmetry is the reason the AAPM Task Group&s Report number 6a titled "Acceptance Testing of Magnetic Resonance Imaging Systems" stated "The sperical shape is recommended for reasons of symmetry." Imaging performance is evaluated in the transaxial coronal sagittal and oblique planes by rotating the sphere.