Patient Positioning for Therapy

NREC designed and implemented a medical image registration system to accurately estimate a patient’s position. It can be used to position patients for radiotherapy, orthopedic therapy, or any other application where patients must be precisely posed for treatment.

The medical image registration system uses 2D X-rays and 3D CT scans to accurately estimate the position and orientation of a patient’s anatomy with respect to an external coordinate frame. High-speed computer graphics algorithms render simulated X-rays from CT scan data in a fraction of a second. These high-resolution, simulated radiographs are compared with actual X-ray images using a novel image comparison algorithm. The comparison algorithm ignores noise in the images and clutter from the patient's other anatomy to correctly estimate the patient's position.

The system achieved sub-millimeter registration accuracies.

Sponsors: Loma Linda University Medical Center; Optivus Technology, Inc.

Above: The system accurately registers the patient’s position with an error of less than a millimeter. Below: Applications include orthopedics, radiotherapy, and other therapies that require precise positioning.