We introduce a portable projection mapping device (PPMD) for extracting and projecting implant geometricdata in single-stage cranioplasty surgery. Our system consists of a real-time tracking device, which tracks thereference markers fixed on the skull, and a digitizing probe for localizing the contour of the cranial defect formodifying the oversized customized cranial implant (CCI). The feature points on the surface of the skull areregistered to the reconstructed surface model of the skull obtained from CT image. The CT model is thenprojected on the surface of the skull. The digitizer is used to outline the geometry of the skull resection withsub-millimeter tracking accuracy. The proposed PPMD and its associated pipeline enable intraoperative cranialimplant modification with image feedback to surgeons for the very first time. Our proposed PPMD system,an inexpensive device can also be used for other medical augmented reality applications, especially when directprojection mapping is preferred over the use of wearable head-mounted displays.
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