A roentgen stereophotogrammetric system. Construction, calibration and technical accuracy

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Radiology

Background:

• Accurate 3D spatial analysis is crucial for experimental and clinical research.
• Existing methods may lack precision or require complex setups.
• Roentgen stereophotogrammetric analysis (RSA) offers a non-invasive approach to track marker positions.

Purpose of the Study:

• To detail the principles and methodology of a novel roentgen stereophotogrammetric analysis system.
• To establish a robust system for precise 3D spatial measurements using standard roentgen equipment.
• To evaluate the accuracy of the system for various applications.

Main Methods:

• Utilized tantalum balls (0.5 or 0.8 mm) as reference markers implanted in the object.
• Employed standard roentgen equipment with simultaneous dual-tube exposure.
• Developed a calibration system with a glass cage and radiopaque markers to establish a laboratory coordinate system.

Main Results:

• The system accurately measures the positions of reference markers within an object.
• Methodologic accuracy was determined for distances, volumes, and movement parameters.
• Performance was assessed across different film/screen and marker combinations.

Conclusions:

• The presented roentgen stereophotogrammetric analysis system provides a reliable method for 3D spatial analysis.
• The system is suitable for both experimental research and clinical applications.
• Precise measurements of object position and movement are achievable with standard equipment.