A simple CT aperture emulator for use with a radiotherapy simulator

Area of Science:

• Medical Imaging
• Radiation Oncology
• Treatment Planning

Background:

• Patient positioning consistency across imaging modalities is crucial for accurate radiation therapy planning.
• Variations in patient setup and scanner limitations (e.g., CT aperture size) can lead to simulation errors and data misalignment.
• Ensuring reproducible patient positioning is challenging due to differing staff, times, and locations of imaging procedures.

Purpose of the Study:

• To develop a device that standardizes patient positioning during simulation for radiation therapy.
• To mitigate issues arising from patient repositioning and CT scanner aperture constraints.
• To improve the accuracy and coordination of data between simulation and CT scanning.

Main Methods:

• Development of a lightweight "halo" device, the CT Aperture Emulator, attachable to simulation equipment.
• The emulator replicates the dimensions of the CT scanner aperture.
• Utilizing the emulator during initial patient simulation to guide positioning and immobilization.

Main Results:

• The CT Aperture Emulator allows for reproducible patient positioning relative to CT scanner constraints.
• It enables technologists and physicians to account for CT aperture limitations during simulation.
• The device facilitates accurate reproduction of the patient's treatment position on the CT scanner, minimizing data discrepancies.

Conclusions:

• The CT Aperture Emulator effectively addresses challenges in patient positioning for radiation therapy planning.
• It enhances the consistency and accuracy of anatomical data acquisition across imaging modalities.
• The device offers a practical solution for integrating simulation and CT scanning, with potential applications for other imaging equipment.