Catphan 500 CT Phantom

The Catphan 500 is a five-generation CT phantom for complete characterization of axial and spiral CT scanner performance. It is built from four modules within a 20 cm housing, covering slice geometry, sensitometry, high-resolution, low-contrast sensitivity, and spatial uniformity testing. Its 23 degree wire ramps allow precise slice thickness measurement, and a universal mount with a level supports fast, consistent daily QA on any scanner. 
 
Key Features:
Four modules in a compact 20 cm housing: CTP401, CTP528, CTP515, and CTP486
Opposed 23 degree wire ramps for precise slice thickness measurement
High-resolution gauge up to 21 line pairs per cm
Low-contrast targets for supra-slice and subslice sensitivity
Solid uniformity module for noise and spatial uniformity testing
Teflon pin for phantom position verification across multiple phantoms
Universal mount with built-in level for fast, repeatable positioning
Table-supported design that eliminates table artifacts
Smári cloud-based analysis included for automated evaluation
 
Test Capabilities:
Slice geometry, slice width, and sensitivity profile
Sensitometry and CT number linearity
Pixel (matrix) size and circular symmetry
High resolution and point spread function
Modulation transfer function (MTF) in x, y, and z axes
Low-contrast sensitivity
Spatial uniformity and noise (precision)
Phantom position verification and patient alignment system check
Scan incrementation
 
Applications:
Daily and periodic CT quality assurance programs
Acceptance testing and commissioning of axial and spiral CT scanners
Routine performance monitoring in radiotherapy simulation and diagnostic CT
Comparison of scanner performance across multiple systems
Patient alignment and table incrementation verification
 
Specifications:
Housing diameter: 20 cm
Main phantom sections: CTP401 (slice geometry and sensitometry), CTP528 (high resolution), CTP515 (low contrast), CTP486 (uniformity)
Sensitometry materials: Teflon, acrylic, LDPE, and air
High resolution: 1 to 21 line pairs per cm
Ramp angle: 23 degrees (opposed pair)
Low-contrast lengths: 3, 5, 7, and 9 mm
Part number: CTP500
Analysis: Smári cloud-based software included
 
Manufactured by The Phantom Laboratory. Supplied by Meditronix Corporation in India.