[Method of measuring modulation transfer function using metal wire in computed tomography].

Area of Science:

• Medical Imaging Physics
• Radiological Technology

Context:

• Modern multi-detector row CT scanners feature complex scanning parameters that significantly impact image quality.
• Accurate quantitative image quality evaluation is crucial for validating selected CT parameters and ensuring diagnostic efficacy.
• The modulation transfer function (MTF) is a key metric for assessing the resolution capabilities of CT systems.

Purpose:

• To adapt and validate the traditional wire method for measuring CT resolution (MTF) to current CT scanner specifications.
• To investigate and optimize critical factors including calculation methods, phantom design, and wire materials for contemporary CT systems.
• To provide updated recommendations for performing reliable and accurate MTF measurements on modern CT equipment.

Summary:

• This research addresses the limitations of outdated methodologies for CT performance evaluation, specifically the wire method for MTF assessment.
• The study systematically examined and refined the components of the wire method, including phantom design, wire material selection, and data analysis techniques.
• Updated guidelines and recommendations are proposed to ensure the effective and valid application of the wire method for quantitative image quality evaluation in current CT imaging.

Impact:

• Facilitates more accurate and reliable resolution measurements for advanced CT scanners, improving diagnostic image quality.
• Provides a standardized, updated protocol for performance evaluation, enhancing consistency and comparability across different CT systems.
• Supports the optimization of CT scanning parameters, leading to enhanced diagnostic confidence and potentially reduced radiation dose.