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Development of phantoms for spiral CT
D J Goodenough1, J R Levy, C Kasales
1The George Washington University, Department of Radiology, Washington, DC 20037, USA.
Summary
A new spiral computed tomography (CT) phantom was developed to improve z-axis uniformity, ensuring accurate imaging by preventing interference from adjacent slices. This advanced phantom effectively tests spiral CT image quality, including low contrast resolution.
Area of Science:
- Medical Imaging Physics
- Radiological Phantoms
Background:
- Spiral CT requires high phantom z-axis uniformity to prevent artifacts.
- Existing phantoms may not meet the stringent demands of modern spiral CT imaging.
Purpose of the Study:
- To develop a novel phantom for spiral CT imaging.
- To enhance z-axis uniformity for artifact-free reconstructed CT slices.
Main Methods:
- Formulation of tissue-like materials for casting in geometric and anthropomorphic shapes.
- Production of test objects with sufficient z-axis length for unperturbed CT slices.
- Development of low contrast samples for sub-slice and supra-slice thickness testing.
Main Results:
- The developed phantom provides comprehensive testing of spiral CT image quality.
- Tests include slice sensitivity, CT number linearity, and high/low contrast resolution.
- Schematic designs and actual CT scans demonstrate phantom capabilities.
Conclusions:
- The new spiral phantom successfully addresses the demands of spiral CT.
- It meets requirements for phantom design, z-axis length, and low contrast resolution testing.