Perspective pinhole model with planar source for augmented reality surgical navigation based on C-arm imaging

International Journal of Computer Assisted Radiology and Surgery
Ho-Gun HaJaesung Hong

Abstract

For augmented reality surgical navigation based on C-arm imaging, accuracy of the overlaid augmented reality onto the X-ray image is imperative. However, overlay displacement is generated when a conventional pinhole model describing a geometric relationship of a normal camera is adopted for C-arm calibration. Thus, a modified model for C-arm calibration is proposed to reduce this displacement, which is essential for accurate surgical navigation. Based on the analysis of displacement pattern generated for three-dimensional objects, we assumed that displacement originated by moving the X-ray source position according to the depth. In the proposed method, X-ray source movement was modeled as variable intrinsic parameters and represented in the pinhole model by replacing the point source with a planar source. The improvement which represents a reduced displacement was verified by comparing overlay accuracy for augmented reality surgical navigation between the conventional and proposed methods. The proposed method achieved more accurate overlay on the X-ray image in spatial position as well as depth of the object volume. We validated that intrinsic parameters that describe the source position were dependent on depth for a three-dime...Continue Reading

References

Jul 28, 2010·IEEE Transactions on Medical Imaging·Nassir NavabJoerg Traub
Mar 9, 2012·Journal of X-ray Science and Technology·Hui MiaoHong Liu
Jul 6, 2014·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·A BertelsenD Borro
Jul 12, 2014·Computers in Biology and Medicine·Cai MengTianmiao Wang

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