Computerized patient contours using the scanning arm of compound B-scanner

Area of Science:

• Medical Physics
• Radiotherapy Technology
• Medical Imaging

Background:

• Modern radiation therapy requires highly accurate patient contouring for optimal treatment delivery.
• Conventional methods like lead wire techniques and Polaroid photography have limitations in precision and accuracy.
• Existing advanced techniques (electromechanical, optical, CT scans) can be accurate but are often expensive.

Purpose of the Study:

• To develop and evaluate a novel, cost-effective method for obtaining accurate patient contours for radiation therapy planning.
• To compare the accuracy of the new ultrasound-based contouring method with established techniques.

Main Methods:

• Utilized a treatment planning minicomputer with an analog-to-digital converter and plotter.
• Integrated a commercially available ultrasound B-scanning arm to capture patient surface data.
• Processed scanner data (voltages) through the A/D interface, smoothing, scaling, and plotting to generate full-scale contours.

Main Results:

• The developed method produces full-scale external patient contours.
• Accuracy of the ultrasound-based method was assessed and compared against alternative contouring techniques.
• The system offers improved accuracy potentially at a lower cost than some advanced alternatives.

Conclusions:

• The ultrasound B-scanning arm integrated with a treatment planning minicomputer provides an accurate method for patient contouring.
• This technique addresses the need for greater accuracy in radiation therapy planning.
• It presents a viable and potentially more economical alternative to existing high-accuracy contouring methods.