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A novel pendulum-based impulse method to measure CT temporal resolution
Naoki Nagasawa1, Satoshi Nakamura2, Jun Matsuo3
1Department of Radiological Technology, Suzuka University of Medical Science, 1001-1, Kishioka, Suzuka, Mie 510-0293, Japan; Department of Radiology, Mie University Hospital, 2-174 Edobashi, Tsu, Mie 514-8507, Japan.
Background:
High temporal resolution (TR) in CT is essential for reducing motion artifacts from rapidly moving structures like the heart. Although the conventional impulse method can measure TR, it requires specialized equipment to accelerate a sphere, which limits its practicality.
Objectives:
This study aimed to develop and validate a simplified pendulum method for TR measurement and validate that it provides equivalent measurements to the conventional approach.
Methods:
TR was measured using the proposed pendulum method and the conventional slingshot method. Fifty scans were acquired for each method at pitch factors (PF) of 0.8 and 1.2. TR was quantified using full width at half maximum (FWHM) and full width at tenth maximum (FWTM). Equivalence was evaluated with the two one-sided tests (TOST).
Results:
The pendulum method demonstrated statistical equivalence to the slingshot method across all tested parameters. For PF 0.8, the FWHM was 0.55 ± 0.03 s for the pendulum method versus 0.54 ± 0.04 s for the slingshot method (TOST, p = 0.005). At PF of 1.2, the FWHM was 0.15 ± 0.01 s for both methods, which were also statistically equivalent (TOST, p = 0.021).
Conclusion:
The pendulum method provides a simple, reproducible approach for TR measurement, facilitating parameter optimization in clinical and research imaging.
