Low Contrast Phantom - German Cancer Research Center

Stefan Schaller

The aim of this phantom is to study low-contrast detectability properties of cone-beam image reconstruction algorithms based on simulations.

Phantom Description

Our phantom is based on the CATPHAN ™ CTP515 Low Contrast Phantom [1]. It contains supra-slice and sub-slice insets. The body is a cylinder of water equivalent material with diameter 20cm. The insets are cylinders with contrasts of 3, 5, and 7 HU respectively. The length of the supra-slice insets is the same as of the outer cylinder, namely 100cm. The sub-slice insets are 3, 5 and 7mm long. The low-contrast objects are placed 2.5cm resp. 5 cm off-center.

[1] Catphan ® Manual, The Phantom Laboratory Inc., Legrys Road, Cambridge, NY 12816, June 1997.

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Phantom Definition
Syntax Definition

A circular diagram features various circles in shades of gray, representing different sizes labeled from "3 mm" to "10 mm." The figure is identified as "Low contrast phantom," highlighting the varying sizes and low contrast of the circles against the background.