Optimal Pancreatic Phase Delay with 64-Detector CT Scanner and Bolus-tracking Technique

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• Pancreatic cancer detection relies on optimal imaging contrast.
• Bolus-tracking methods help standardize contrast-enhanced computed tomography (CT) protocols.
• Determining the ideal pancreatic phase delay is crucial for diagnostic accuracy.

Purpose of the Study:

• To identify the optimal pancreatic phase delay for contrast-enhanced CT.
• To evaluate the impact of scan delay on pancreatic parenchymal enhancement.
• To assess the effect of scan delay on tumor-to-pancreas contrast for pancreatic lesions.

Main Methods:

• Randomized controlled trial involving 150 patients with suspected pancreatic tumors.
• Utilized 64-detector CT with individualized scan delays of 10, 20, or 30 seconds post-aortic enhancement.
• Contrast material volume was adjusted for patient weight; aortic enhancement threshold was 150 HU.

Main Results:

• Pancreatic parenchymal enhancement was significantly higher at 20 and 30-second delays compared to 10 seconds (P < .001).
• Tumor-to-pancreas contrast for solid tumors was significantly greater with a 30-second delay versus a 10-second delay (P = .015).
• Adenocarcinoma-to-pancreas contrast was superior with 20 or 30-second delays compared to 10 seconds (P = .027 and .011).

Conclusions:

• An individualized scan delay of 30 seconds optimizes pancreatic enhancement and tumor conspicuity.
• This delay provides superior tumor-to-pancreas contrast compared to a 10-second delay.
• Weight-adjusted contrast volume and a 4 mL/s flow rate support the 30-second delay protocol.