Evaluation of computed tomography arterial portography scan timing using different bolus tracking methods

Area of Science:

• Radiology
• Medical Imaging
• Interventional Radiology

Background:

• Computed tomography arterial portography (CTAP) is a standard imaging technique.
• Current CTAP protocols often use fixed scan timing and contrast doses, which may not be optimal.
• Real-time monitoring of contrast medium inflow can potentially enhance CTAP accuracy.

Purpose of the Study:

• To analyze and compare different bolus tracking methods for optimizing CTAP scan timing.
• To evaluate the effectiveness of liver parenchyma-based region of interest (ROI) tracking versus other methods.
• To determine the optimal scan timing for improved contrast enhancement in CTAP.

Main Methods:

• A retrospective analysis of 249 patients undergoing CTAP was performed.
• Three methods were compared: fixed scan timing (33s post-injection), inferior vena cava-ROI method, and liver parenchyma-ROI method.
• Scan timing was optimized when the CT value difference between hepatic and portal veins approached zero.

Main Results:

• The liver parenchyma-ROI method demonstrated significantly better scan timing optimization compared to the fixed and inferior vena cava-ROI methods.
• Appropriate scan timing, defined by minimal CT value difference between hepatic and portal veins, was more frequently achieved with the liver parenchyma-ROI method.
• This suggests improved real-time contrast tracking and delivery.

Conclusions:

• The liver parenchyma-ROI method is a superior approach for optimizing CTAP scan timing.
• Implementing real-time bolus tracking with liver parenchyma ROIs can enhance the diagnostic quality of CTAP.
• This method offers a more personalized and effective approach to CTAP protocols.