Improved pelvicalyceal visualization with multidetector computed tomography urography; comparison with helical...

Area of Science:

• Radiology
• Medical Imaging

Background:

• Computed tomography (CT) urography is crucial for visualizing the pelvicalyceal system.
• Conventional helical CT often requires high contrast material doses, potentially increasing risks.
• Optimizing CT urography protocols is essential for diagnostic accuracy and patient safety.

Purpose of the Study:

• To compare pelvicalyceal visualization quality using a novel CT urography protocol.
• To evaluate a protocol combining hydration, low-dose contrast material, and high-resolution multidetector CT (MDCT).
• To compare this protocol against conventional helical CT.

Main Methods:

• A prospective study comparing two groups: test (MDCT, 30 ml contrast) and control (helical CT, 120-150 ml contrast).
• Both groups received hydration and were scanned 5 minutes post-contrast injection.
• Pelvicalyceal visualization was assessed using a five-scale grading system for enhancement and calyceal detail.

Main Results:

• The MDCT group showed significantly better calyceal detail (3.4/5) than the helical CT group (1.8/5) (p<0.0001).
• While both groups had substantial calyceal attenuation ( > 220 HU), the control group had higher mean attenuation (920 HU vs. 475 HU).
• The MDCT protocol resulted in less contrast material dose while achieving superior visualization.

Conclusions:

• Combining hydration, a low contrast material dose, and high-resolution MDCT significantly enhances pelvicalyceal visualization in CT urography.
• This optimized protocol offers improved diagnostic quality for CT urography.
• The findings suggest a potential shift towards lower contrast volumes in CT urography.