医疗模体：

模体用来检测医院的CT性能，由塑料制成，Catphan500, Catphan600, Catphan5700, CTP500, CTP600, CTP700等. 另外一个是医院的磁共振性能检测模体，完全使用有机玻璃制成，也有两个型号，其中的圆柱形，就是Magphan® SMR170，厂家是美国模体实验室。

功能：Phantomlab与物理学家兼哲学家Goodenough, Ph.D.,共同努力发展了Catphan®模体。新型的Catphan®模体设计是基于医疗成像仪器方面二十多年的科学研究和临床经验。该种模体可以应用于轴向和螺旋CT扫描成像系统的各种操作评价以及质量保证系统。

不同的模块组成了Catphan®模体，这些模块尚可适用于连续20cm空间。为了在Catphan®424中使用水容器，所有Catphan®组件都是由Solid-cast材料构成。Solid-cast结构可以降低材料的吸水性和水浴模体相关的露水问题。

包括Catphan®500在内共有三种基本Catphan®模体。Catphan®是为螺旋CT扫描而殊设计的。

包括Catphan®模体的选择性测试模块及其标

准，经常被用于进行许多实验测量。包括以下

一、参数的评估：

扫描几何学(层宽和灵敏度曲线)

高分辨率(高至20线对/厘米)

体模定位验证

病人定位系统验证

supra-slice低对比度灵敏度

subslice低对比度灵敏度

空间均匀性

扫描增量

CT系统噪声(精度)

圆对称性

灵敏度(线性)

象素(矩阵)尺寸

动态扫描

X、Y、Z轴的点扩散函数和调制传递函数(MTF)

patient alignment system check low contrast sensitivity comparative subslice and supra-slice low contrast sensitivity spatial uniformity scan incrementation noise (precision) of CT systems circular symmetry sensitometry (linearity) pixel (matrix) size point spread function and modulation transfer function (MTF) for the x, y, and z axes Catphan® 700(Stock CTP700) - Complete Catphan® including housing and case, equipped with the following test modules: CTP682 - Geometry sensitometry and point source module CTP714 - 30 line pair high resolution module CTP515 - Subslice and supra-slice low contrast CTP721 - Wave insert CTP723 - Bead blocks CTP712 - Uniformity section

Catphan 600®(Stock CTP600) - Complete Catphan® including housing and case, equipped with the following test modules: CTP404 - Slice width, sensitometry and pixel size CTP591 - Bead Geometry module CTP528 - 21 line pair high reslution and point source CTP515 - Subslice and supra-slice low contrast CTP486 - Solid image uniformity module Catphan® 500(Stock CTP500) - Complete Catphan including housing and case, equipped with the following test modules: CTP401 - Slice width, sensitometry and pixel size CTP528 - 21 line pair high resolution and point source CTP515 - Subslice and supra-slice low contrast CTP486 - Solid image uniformity module Catphan® 412(Stock CTP412) - Complete Catphan including housing and case, equipped with the following test modules: CTP401 - Slice width, sensitometry and pixel size

CTP445 - MTF module with bead point source CTP446 - 20 line pair high resolution CTP263 - Low contrast CTP486 - Solid image uniformity module Catphan® 424(Stock CTP424) - Complete Catphan including housing and case, equipped with the following test modules: CTP401 - Slice width, sensitometry and pixel size CTP445 - MTF module with bead point source CTP446 - 20 line pair high resolution CTP263 - Low contrast CTP422 - Liquid bath Catphan® 440(Stock CTP440) - Complete Catphan including housing and case, equipped with the following test modules: CTP401 - Slice width, sensitometry and pixel size CTP592 - Low and high contrast resolution module