Feasibility of a fixed scan delay technique using a previous bolus tracking technique data for dynamic hepatic CT

Area of Science:

• Radiology
• Medical Imaging
• Hepatobiliary Imaging

Background:

• Hepatic computed tomography (CT) scans are crucial for monitoring hepatocellular carcinoma.
• Bolus tracking is a common technique to optimize contrast enhancement timing.
• Evaluating alternative timing techniques is important for efficient and reliable imaging.

Purpose of the Study:

• To compare contrast enhancement and image quality in hepatic CT scans.
• To assess the efficacy of a fixed scan delay technique against bolus tracking.
• To determine feasibility for hepatocellular carcinoma follow-up.

Main Methods:

• Fifty patients underwent three hepatic CT exams with contrast administration.
• Two exams used bolus tracking, and one used a fixed scan delay based on prior bolus tracking data.
• Attenuation values and visual quality of hepatic arterial phase images were analyzed.

Main Results:

• No significant difference in 50-HU threshold times between repeated bolus tracking exams (1.3±0.9 s).
• No significant intra-patient differences in organ attenuation or visual image quality across the three techniques.
• Hepatic arterial phase imaging quality was consistent across all tested methods.

Conclusions:

• The fixed scan delay technique is a feasible alternative for hepatic CT exams.
• This technique provides comparable image quality to bolus tracking for hepatocellular carcinoma follow-up.
• Utilizing previous bolus tracking data simplifies scan timing for routine follow-up.