美国The Phantom Laboratory   Catphan 500 CT性能测试模体已得到全球知名CT生产公司的认同，都用它来标示CT机的成像性能。该模体较依据AAPM 1977年1号报告生产加工的注水模体有很多优点：因是固体模体，没有漏水的问题；储运箱能当模体支架，模体能探出扫描床外；低对比度分辨力模体由同一种物质不同密度材料制成等。

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一、参数的评估：

 扫描几何学(层宽和灵敏度曲线)

 高分辨率(最高至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