Evaluating long-term performance and quality control of the uMI 550 positron emission tomography- computed tomography (PET-CT) system: A comprehensive scientific analysis.

INTRODUCTION

Ensuring the long-term performance and reliability of positron emission tomography-computed tomography (PET-CT) systems is essential for accurate clinical diagnostics and treatment planning. This study provides a comprehensive analysis of the periodic quality control (QC) processes of the uMI 550 PET-CT system, focusing on key performance parameters such as standardized uptake value (SUV) accuracy, spatial alignment, and image uniformity.

METHODS

Periodic semi-annual QC tests were conducted to evaluate the system's performance across multiple parameters. Key metrics included SUV measurements, spatial alignment across X, Y, and Z axes, and uniformity tests. Statistical analyses assessed variability and stability over time, including ANOVA, t-tests, and linear regression.

RESULTS

The results demonstrated consistent SUV measurements within the reference range of 0.95-1.05, indicating robust quantitative accuracy. Spatial alignment was maintained within a tolerance of -1.5 mm to +1.5 mm, ensuring geometric integrity crucial for accurate image fusion in radiotherapy planning. Uniformity tests showed transverse and axial uniformity values remained within acceptable limits (0.00-0.05), ensuring high-quality imaging across the field of view. Statistical analyses confirmed no significant drift or variability across QC intervals, highlighting the system's reliability over time.

CONCLUSION

The uMI 550 PET-CT system demonstrated consistent performance across critical parameters, validating its suitability for a wide range of clinical applications. Regular QC testing plays a vital role in maintaining system accuracy and reliability.

IMPLICATIONS FOR PRACTICE: This study underscores the importance of routine quality control procedures in ensuring the long-term stability and reliability of PET-CT systems. The robust performance of the uMI 550 supports its use in oncology and other diagnostic fields, providing clinicians with confidence in treatment decisions.