Automated Task-Transfer Function Measurement for CT Image Quality Assessment Based on AAPM TG 233.

Area of Science:

• Medical Physics
• Image Analysis
• Radiological Imaging

Background:

• Accurate measurement of the task-transfer function (TTF) is crucial for CT quality assurance.
• Existing methods for TTF measurement can be time-consuming and require manual intervention.

Purpose of the Study:

• To develop and validate user-friendly software for automatic TTF measurement.
• To ensure the software adheres to the American Association of Physicists in Medicine (AAPM) Task Group (TG) 233 guidelines.

Main Methods:

• Software developed for automatic region of interest (ROI) placement and TTF calculation.
• Tested on four CT phantom types (computational, ACR 464, AAPM, Catphan® 604) with varying parameters.
• Results compared against manual measurements using ImQuest and iQmetrix-CT software.

Main Results:

• Software accurately located ROIs in all circular objects across phantoms.
• Achieved accurate TTF measurements with various contrast-to-noise ratios (CNRs).
• TTF results were comparable to manual measurements, with smoother curves than ImQuest.

Conclusions:

• A validated algorithm for automated TTF measurement was successfully developed.
• The software offers a highly user-friendly, single-click solution for TTF analysis.
• This tool enhances efficiency and consistency in CT quality assurance procedures.