Hepatic spiral CT in children: scan delay time-enhancement analysis

Area of Science:

• Radiology
• Pediatric Imaging
• Medical Imaging Techniques

Background:

• Hepatic enhancement in spiral CT is crucial for accurate diagnosis in pediatric patients.
• Optimizing contrast timing is essential for maximizing image quality in pediatric liver imaging.

Purpose of the Study:

• To evaluate the impact of varying time delays between contrast administration and spiral CT initiation on hepatic enhancement in children.
• To determine the optimal scanning delay for improved hepatic contrast enhancement in pediatric spiral CT.

Main Methods:

• Forty-five pediatric patients (2-9 years) underwent spiral CT with sequential liver scans.
• Three scanning groups were established based on timing relative to contrast injection: 80%, 100%, and 150% of injection time.
• Hepatic, aortic, and inferior vena caval enhancement were quantified using region-of-interest measurements.

Main Results:

• The 100% injection time group demonstrated significantly greater mean hepatic enhancement (47.0 HU) compared to 80% (41.4 HU) and 150% (40.6 HU) groups (p < 0.05).
• A mean aortocaval difference exceeding 10 HU was consistently observed across all groups.
• Optimal hepatic enhancement was achieved when scanning commenced immediately upon completion of contrast injection.

Conclusions:

• Initiating spiral CT scanning after complete contrast injection significantly enhances hepatic enhancement in pediatric patients.
• This optimized timing protocol can improve the diagnostic quality of hepatic spiral CT examinations in children.
• These findings provide valuable guidance for pediatric radiologists to enhance liver imaging protocols.