METHOD FOR ARTIFACT-FREE RENDERING OF METAL PARTS IN THREE-DIMENSIONALLY RECONSTRUCTED IMAGES

摘要

A method for artifact-free rendering of metal parts in 3D three-dimensionally reconstructed images of an examination object in a patient, includes recording a 3D scan without metal parts producing a 3D data record, recording n projection images with metal parts from known locations or directions, 2D/3D registering bone in the n projection images with the 3D data record, 2D/3D registering of the metal parts from the n projection images and 3D models of the metal parts, calculating locations of the metal parts in the 3D data record based on the 2D/3D registration thereof, and superposing all current locations of the metal parts in the 3D data record. There is no need for a new 3D scan to check current screw positions. The 3D representation of screw positions in the bone is performed without artifacts, enabling reliable assessment of screw locations, for example in spinal column surgery.

主权项

1. A method for artifact-free rendering of metal parts in three-dimensionally reconstructed images of an examination object in a patient, the method comprising the following steps:
S1) recording a 3D scan without metal parts for producing a 3D data record; S2) recording n projection images with metal parts from known locations or directions; S3) 2D/3D registering of bone in the n projection images with the 3D data record; S4) 2D/3D registering of the metal parts from the n projection images and 3D models of the metal parts; S5) calculating locations of the metal parts in the 3D data record on the basis of the 2D/3D registration thereof; and S6) superposing all current locations of the metal parts in the 3D data record.