Evaluating Lung Changes in Long COVID: Ultra-Low-Dose vs. Standard-Dose CT Chest

Area of Science:

• Radiology
• Pulmonology
• Medical Imaging

Background:

• Frequent chest CTs in long COVID patients raise concerns about cumulative radiation exposure.
• Assessing alternative imaging techniques is crucial for safe and effective patient monitoring.

Purpose of the Study:

• To evaluate the image quality and diagnostic accuracy of ultra-low-dose CT (ULDCT) versus standard-dose CT (SDCT) for identifying lung abnormalities in long COVID.
• To compare the performance of ULDCT in obese versus non-obese patients.

Main Methods:

• Prospective study of 100 long COVID patients comparing ULDCT and SDCT.
• Objective (SNR) and subjective image quality assessments were performed.
• Detection of long COVID imaging patterns, CT severity scoring, and radiation dose were analyzed.

Main Results:

• ULDCT demonstrated high diagnostic confidence and sensitivity for common long COVID lung patterns.
• Non-obese patients showed significantly higher sensitivity and accuracy with ULDCT compared to obese patients.
• ULDCT achieved a 94.8% reduction in effective radiation dose compared to SDCT.

Conclusions:

• ULDCT is a viable alternative to SDCT for diagnosing long COVID lung abnormalities, particularly in non-obese individuals.
• This technique substantially lowers radiation dose without compromising diagnostic accuracy in specific patient groups.