美国模体实验室Magphan SMR170核磁共振性能模体
Ø 主要用于MRI性能测试；
Ø 丙烯酸材料的圆柱形模体和球形模体，内径20cm，模体内部加注硫酸铜溶液；
Ø 测信躁比、T1,T2值、空间分辨率(高分辨率)、密度分辨率(低对比度)、几何线性等；
Ø 头/身躯复合性能测量模体，测量水当量值、均匀性、噪声、图象一致性.
Cylindrical and Spherical Magphans®
Precise, Comprehensive Testing of MRI Scanners
Magphan® Phantoms are designed to perform a wide range of precision performance evaluations of Magnetic Resonance Imaging (MRI) Scanners.
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.
· signal-to-noise ratio (SNR)
· spherical geometry
· in-vitro sample testing
· geometric distortion (spatial linearity)
· pixel (matrix) size verification
· scan slice width and contiguity
· verification of patient alignment system
· spatial resolution up to 11 line pairs per cm (0.45mm resolution)
· low contrast sensitivity
· T1 and T2 measurements
· evaluation of 3-dimensional volume reconstruction
Magphan® Phantoms are designed to perform a wide range of precision performance evaluations of Magnetic Resonance Imaging (MRI) Scanners.
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.
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