Surface image guided radiotherapy Clinical applications and Challenges Our Experience
Optical Surface Scanners
- 3D Optical surface guided is noninvasive technology
- Light Projectors, Multiple sensors, Reconstruction
- A Narrow band width light(Red) from projector illuminates the object.
- Reflected lights from the object grabbed by the sensors
- Reconstruction of multiple surface layers 3D surface of actual geometry.
AlignRT How Does it works
Step 1: Calibration
Step 2: Active Stereo
Project pseudo-random optical speckle pattern on the subject The pattern adds texture and is used for 3D reconstruction The near infrared light is not harmful to the patient’s eyes
Step 3: Vertices are then created and triangulated Each vertex comprises (x, y, z) values
Each triangle consists of 3 corresponding vertices
Step 4: The system creates a 3D surface model consisting of 10000 to 20,000 points
Surface data is composed of a number of triangles
The greater the number of triangles, the higher the surface resolution, less frame rate