Aortic valve prosthesis tracking for transapical aortic valve implantation

Area of Science:

• Medical Imaging
• Surgical Technology
• Biomedical Engineering

Background:

• Transapical aortic valve implantation (TA-AVI) is a minimally invasive procedure for aortic stenosis.
• Accurate placement of the aortic valve prosthesis (AVP) is critical to avoid clinical complications.
• Current TA-AVI relies on 2D X-ray fluoroscopic guidance, which can be challenging for precise AVP positioning.

Purpose of the Study:

• To develop and evaluate a method for tracking the AVP in 2D X-ray fluoroscopic images.
• To enhance the accuracy of AVP placement during TA-AVI procedures.
• To provide a foundational step towards automated optimal AVP implantation.

Main Methods:

• A template matching approach was employed to estimate AVP position.
• A shape model of the prosthesis was used to extract corner points in image sequences.
• Manual initialization of AVP corner points in the first image provided algorithm parameters.

Main Results:

• The AVP tracking method was evaluated on six intra-operative 2D fluoroscopic sequences.
• Automatic AVP localization results closely matched manually defined positions.
• Maximum localization errors were under 1 mm, falling within clinically accepted ranges.

Conclusions:

• A novel method for tracking AVP in 2D X-ray fluoroscopic sequences has been developed to assist TA-AVI.
• The developed AVP tracking method represents a significant advancement towards automated optimal AVP placement.
• This technology has the potential to improve patient outcomes in TA-AVI procedures.