3D Spatial Resolution, Slice Sensitivity and Wire MTF Phantom

3D Spatial Resolution Phantom

• D100 compatible version available
• Evaluates spatial resolution in-plane and axial
• Provides several hole patterns in two planes

The high-contrast Spatial Resolution Phantom (3D SR) visualizes the impact of collimation, slice width, pitch and the image reconstruction algorithms. The test pattern consists of a series of drilled holes with varying spacing providing an order of magnitude in spatial frequency. With spiral/helical CT allows to evaluate axial images and coronal reformation. In addition, the spatial 3D resolution can be tested by a single scan.

Slice Sensitivity Phantom

• Measures and evaluates the slice sensitivity in spiral CT volume scans
• Houses a 1 mm diameter and 25 μm thin centrally placed gold plate

The Slice Sensitivity Phantom is designed to check the slice sensitivity of the CT scanner within the spiral/helical scan modes. It contains a 25 µm thick metal foil of circular area, embedded in a cylinder of uniform tissue-equivalent plastic. With the heavy-metal insert an evaluation of all collimations between 0.5 up to 10 mm with adequate image contrast is possible. Analyzing the maximum CT number of the high-contrast insert for a series of axial images can be performed as well.

Wire MTF Phantom

• D100 compatible version available
• Assess in-plane spatial resolution of any 3D
• X-ray imaging system with PSF and MTF
• Available with wire free in ‘air’ or in resin

The Wire MTF Phantom is based on a cylinder containing one or more wires in solid material aligned parallel to the phantom axis of rotation.
As a variation, one of two wires can be placed slightly off center, the other one in the periphery to allow estimating image quality in plane at two different positions. Point Spread Function (PSF) and Modulation Transfer Function (MTF) can be easily investigated. Different wire diameters are available as well as different materials and positions of the wires inside the phantom.

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