Image quality improvement in head and neck CT angiography: Individualized post-trigger delay versus fixed delay

Area of Science:

• Radiology
• Medical Imaging

Background:

• Head and neck CT angiography (CTA) is crucial for diagnosing vascular conditions.
• Optimizing contrast media opacification is key for accurate CTA interpretation.
• Conventional fixed post-trigger delay (PTD) may not always provide optimal timing for contrast enhancement.

Purpose of the Study:

• To compare the contrast media opacification and image quality of head and neck CTA using individualized PTD versus a fixed PTD.

Main Methods:

• A prospective study involved 196 participants randomly assigned to either individualized PTD or fixed 4-second PTD for head and neck CTA.
• Image quality was assessed objectively and subjectively by experienced readers.
• Statistical analysis included two-sample t-test for objective measures and chi-square analysis for subjective ratings.

Main Results:

• No significant differences in participant demographics were observed between the groups.
• Individualized PTD (average 5.6 s) was shorter than the fixed delay (p < 0.05).
• Group A (individualized PTD) demonstrated significantly higher mean vessel enhancement and better subjective image quality ratings from both readers (p < 0.05).

Conclusions:

• Individualized PTD in head and neck CTA optimizes vessel opacification and enhances image quality compared to fixed PTD.
• This approach ensures reliable scan timing for improved diagnostic accuracy in CTA.
• Individualized PTD represents a superior method for contrast-enhanced head and neck CTA.