CBCT to MR registration via hidden shape reconstruction and robust point matching

摘要

In the image guidance method, a stream of cone beam computed tomography (CBCT) images of an anatomical organ is acquired using a CBCT imaging device (34). For each CBCT image (44), the surface of the organ in the CBCT image is segmented to produce a segmented surface (70) of the anatomical organ in the CBCT image. A concealed shape reconstruction (66) using a statistical pre-shape (68) may be used to reconstruct a missing or concealed surface portion. A preoperative medical image (12) of the anatomical organ and the CBCT image are spatially aligned. This is by distorting one of the images to the other using point set registration of the segmented surface (30) of the organ in the pre-operative medical image and the segmented surface of the organ in the CBCT image. . A fused image (82) is displayed that combines the distorted image and the other image.