Diagnostic Accuracy and Measurement Variability of Urinary Stones Across CT Window Settings: A Systematic Review and...

Area of Science:

• Radiology
• Urology
• Medical Imaging

Background:

• Computed tomography (CT) is crucial for diagnosing and managing urolithiasis (urinary stones).
• Variations in CT windowing techniques can impact stone dimension measurements, influencing clinical decisions.
• Standard soft-tissue windows may not provide optimal accuracy for urinary stone assessment.

Purpose of the Study:

• To analyze the diagnostic accuracy and variability of urinary stone measurements using different CT window settings.
• To compare the effectiveness of soft-tissue versus bone window settings for CT-based stone measurement.
• To identify optimal CT parameters for precise urinary stone characterization.

Main Methods:

• Systematic electronic literature search across PubMed, Scopus, Web of Science, and Cochrane Library.
• Meta-analysis using a random-effects model to synthesize data from comparative studies.
• Focus on studies comparing stone size measurements between standard soft-tissue and bone window settings.

Main Results:

• Bone window settings demonstrated superior accuracy and reduced inter-observer variability in stone measurements compared to soft-tissue settings.
• Improved accuracy was also associated with smaller slice thickness and multi-planar reformatting.
• Bone window settings provided more consistent diagnostic judgments, particularly for smaller stones relevant to treatment planning (e.g., ureteroscopy, conservative management).

Conclusions:

• CT bone window imaging is recommended for assessing urinary stones to enhance measurement accuracy and minimize variability.
• Standardization of imaging protocols and development of consensus guidelines for CT windowing in urinary stone evaluation are necessary.
• Implementing standardized CT protocols will support more accurate diagnoses and improve patient management strategies for urolithiasis.