Axially extended-volume C-arm CT using a reverse helical trajectory in the interventional room

Area of Science:

• Medical Imaging
• Interventional Radiology
• Computed Tomography

Background:

• C-arm computed tomography (CT) offers 3-D imaging from 2-D X-ray projections, enhancing interventional efficacy and safety.
• Current C-arm CT systems use circular scans, limiting axial coverage and posing challenges for imaging long structures like the aorta or spine.

Purpose of the Study:

• To develop and validate an axially extended-volume C-arm CT technique for imaging long objects.
• To overcome the axial coverage limitations of conventional C-arm CT systems in interventional settings.

Main Methods:

• Development of a novel calibration method for C-arm systems.
• Implementation and assessment of a reverse helical trajectory for data acquisition.
• Creation of a reconstruction algorithm tailored for reverse helical C-arm CT data.
• Quantitative evaluation of image quality and geometric repeatability.

Main Results:

• Demonstrated feasibility of implementing and reliably repeating a reverse helical trajectory on a multiaxis C-arm system.
• Successfully reconstructed long-volume images with satisfactory image quality using reverse helical data.

Conclusions:

• The reverse helical trajectory is a viable method for achieving axially extended-volume C-arm CT in the interventional room.
• This technique significantly expands the imaging capabilities of C-arm CT for complex anatomical regions.