This is a quick demonstration of the Varian Identify image-guided patient positioning system at the American Association of Physicists in Medicine (AAPM) 2019 meeting. It helps align patients on the radiotherapy system treatment table to match the position they were in when the computed tomography (CT) scan was created. This ensures the radiation beams are delivered according to the treatment plan and will not be aimed accidentally at health tissue. It uses real-time tracking of the surface of the patient's skin using three visible light emitters, so it does not add dose, such as when on-board X-ray imaging is used. The system compares the patients position to the treatment plan CT scan and color codes in red any areas that are not in the proper position. It also uses RFID tags on the table to help know the exact position of the patient.
The system can show the radiotherapist if the patient is no longer aligned with the plan and the therapist can manually stop the therapy. The vendor said in the future, they plan to integrate the system with Varian's therapy systems so treatment will be stopped automatically by the Identify system.
The system also uses a biometric scanner to ensure the correct plan is being used with the correct patient.
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