Phantom Laboratory Catphan 503 - Illustration of Catphan 503 Model

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Because of beam divergence a physicist may develop specic alignment protocols.
Single slice axial CT: the phantom can be centered on the CTP404 module and then
after verifying the alignment, the table can be indexed to the center of the other modules.
Spiral CT: the scanner can be aligned with the rst module and then the phantom can
be scanned in one sequence.
Review the scans of the CTP404 module to check the image for proper alignment as
illustrated in the Phantom position verication section.
Illustration of Catphan® 503 model
Note: The brass mount nuts hold the mount to the phantom housing. Only the black
adjusting thumb screws should be used to level the phantom.