A preliminary study on adaptive field-of-view tracking in peripheral digital subtraction angiography

Area of Science:

• Medical Imaging
• Radiology
• Biomedical Engineering

Background:

• Peripheral angiographies are common, leading to significant radiation exposure.
• Reducing radiation dose in Digital Subtraction Angiography (DSA) is crucial for patient safety and healthcare benefits.

Purpose of the Study:

• To demonstrate the feasibility of adjusting the field-of-view in real-time while tracking the contrast bolus.
• To reduce radiation dosage during DSA by dynamically minimizing the imaging area.

Main Methods:

• Utilizing an EKG-gated Hammerstein model to predict bolus speed during systole and diastole.
• Developing a real-time algorithm to extract bolus dynamics and define the field of view (transversely and longitudinally).
• Implementing a limb stabilization technique to mitigate image misalignment.

Main Results:

• Simulation results indicate the proposed techniques are effective for dose reduction.
• The bolus chasing speed is accurately estimated using the EKG-gated Hammerstein model.
• Real-time bolus tracking and field-of-view adjustment were successfully simulated.

Conclusions:

• The presented method shows promise for clinical application in DSA.
• Synchronizing imaging with bolus movement offers a viable strategy for radiation dose reduction.
• Dynamic field-of-view adjustment is a key component in minimizing patient exposure during angiography.