MAGPHAN® MRI PHANTOMS
Magphan phantoms are designed to perform a wide range of precision performance evaluations of Magnetic Resonance Imaging (MRI) Scanners. The design criteria for the original Magphan phantoms are based on physicist Dr. David Goodenoughʼs 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 more than a decade of scientific evaluation and field experience.The (MR Distortion or Quantitative Imaging) Magphan phantoms were developed with the guidance of Richard Mallozzi, Ph.D. to provide accurate 3-D information on MR distortion.
Magphan RT : The Magphan RT phantom is designed to meet the specific needs for MR QA in radiotherapy. The easy-to-handle modular design comes in two size configurations with arrays of precisely located spheres. Known and scanned sphere positions are compared, producing a highly accurate and detailed 3D map of MR image distortion. A number of other critical MR image parameters are also measured. The Magphan RT system includes an automated analysis service provided by Image Owl, Inc.
Magphan Quantitative Imaging Phantom for MR Distortion (EMR 051):The EMR051 model contains an array of 165 precisely positioned polycarbonate spheres. Known and scanned sphere positions are compared, producing a highly accurate and detailed 3D map of MR image distortion. The phantom is suitable for neuroimaging studies and measuring distortion in radiation therapy MR planning and guidance scanners. The Phantom Laboratory has partnered with Image Owl, Inc. to provide convenient and accurate online distortion analysis of the Magphan EMR051 phantom.
Magphan Quantitative Imaging Phantom for MR Distortion (EMR 121) : The 18cm EMR121 model has been designed to fit into smaller head coils that do not have clearance for the 20cm EMR051 model above. This model contains an array of 127 precisely positioned polycarbonate spheres. Comparing known and measured sphere positions produces a highly accurate and detailed 3D map of MR image distortion. The phantom is highly suitable for measuring and tracking distortion for neuroimaging studies and for radiation therapy MR planning and guidance scanners.
Spherical Magphan (SMR100) : A urethane sphere composed of two hemispherical shells with an inner diameter of 20cm. The shells are connected with a simple threaded flange connecting ring. The test cube assembly can be quickly removed without tools for greater imaging flexibility and easy access for cleaning and maintenance.
Cylindrical Magphan (SMR170) : The Magphan is also available with a conventional cylindrical housing for test groups and manufacturers who base their performance specifications on cylindrical phantoms. It has a removable end plate for internal access. The acrylic cylinder has an outer diameter of 20cm and an inner diameter of 19cm.
For detailed information on each phantom please see the individual product pages.
Patented Spherical Design
The Magphanʼs 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 Groupʼs Report number 6a, titled “Acceptance Testing of Magnetic Resonance Imaging Systems,” recommends the spherical shape. Imaging performance is evaluated in the transaxial, coronal, sagittal and oblique planes by rotating the sphere. The Magphan® is also available with a conventional cylindrical housing for test groups and manufacturers who base their performance specifications on cylindrical phantom.