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Finite Element mesh generation remains an important issue for patientspecific biomechanical modeling. While some techniques make automatic meshgeneration possible, in most cases, manual mesh generation is preferred forbetter control over the sub-domain representation, element type, layout andrefinement that it provides. Yet, this option is time consuming and not suitedfor intraoperative situations where model generation and computation time iscritical. To overcome this problem we propose a fast and automatic meshgeneration technique based on the elastic registration of a generic mesh to thespecific target organ in conjunction with element regularity and qualitycorrection. This Mesh-Match-and-Repair (MMRep) approach combines control overthe mesh structure along with fast and robust meshing capabilities, even insituations where only partial organ geometry is available. The technique wassuccessfully tested on a database of 5 pre-operatively acquired complete femoraCT scans, 5 femoral heads partially digitized at intraoperative stage, and 50CT volumes of patients' heads. The MMRep algorithm succeeded in all 60 cases,yielding for each patient a hex-dominant, Atlas based, Finite Element mesh withsubmillimetric surface representation accuracy, directly exploitable within acommercial FE software.

A fast and robust patient specific Finite Element mesh registration technique: application to 60 clinical cases