Practical workflow for arbitrary non-circular orbits for CT with clinical robotic C-arms.

Area of Science:

• Medical Imaging
• Radiological Physics
• Computational Imaging

Background:

• Non-circular orbits in cone-beam CT (CBCT) imaging are explored for enhanced field-of-view, reduced radiation dose, improved image quality, and artifact reduction.
• Clinical implementation of novel CBCT orbits faces challenges in orbit realization, geometric calibration, and reconstruction, particularly on advanced systems like robotic C-arms.

Purpose of the Study:

• To address critical challenges in the geometric calibration stage for non-circular CBCT orbits.
• To develop a novel calibration method that facilitates practical clinical implementation of advanced CBCT trajectories.

Main Methods:

• Development of a novel geometric calibration method specifically for non-circular CBCT orbits.
• Integration of the new calibration method into the existing CBCT workflow, focusing on clinical relevance and efficiency.

Main Results:

• The proposed calibration workflow eliminates the need for pre-acquisition patient scans or specialized calibration phantoms.
• The method achieves clinically relevant processing times, overcoming a major implementation hurdle.

Conclusions:

• The novel geometric calibration method significantly simplifies the implementation of non-circular orbits in clinical CBCT systems.
• This advancement paves the way for wider adoption of advanced CBCT trajectories, leveraging their potential benefits.