Int J Comput Assist Radiol Surg - Non-iterative partial view 3D ultrasound to CT registration in ultrasound-guided computer-assisted orthopedic surgery.


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RPOSE: In image-guided orthopedic surgery, rigid registration of intra-operative ultrasound (US) to a pre-operative plan, developed using computed tomography (CT) scans, is an important step for providing real time surgical guidance. The ability to perform this registration accurately, automatically, and in real time is critical for enabling more effective image guidance and anatomic restoration in a number of orthopedic procedures. Several surface-based and intensity-based registration methods have been proposed before to align the US and CT data. Although relatively successful results were reported, both methods require accurate segmentation or localization of the bone surface in US data, which is a challenging task. Furthermore, typically, only partial views of the three-dimensional (3D) bone anatomy are visible in US data, and registration would only converge if a good estimation of the initial alignment between the US and CT datasets is known.METHODS: We propose a 3D rigid CT to US registration method based on the alignment of local phase bone image projections. The registration is achieved by transforming the local phase bone features, calculated using 3D Log-Gabor filters, to a projection space obtained using 3D Radon transform. Validation experiments show the capability of the method in registering partial view US volumes to full view CT volume.RESULTS: Feasibility experiments, carried out on a phantom and ten volunteer subjects, show an average surface registration, in the region where the US scans were acquired, of 0.42 and 0.78? mm, respectively.CONCLUSIONS: The proposed US to CT registration method is fully automatic, non-iterative and requires no initial alignment between the two registering datasets.

Resumo Limpo

rpose imageguid orthoped surgeri rigid registr intraop ultrasound us preoper plan develop use comput tomographi ct scan import step provid real time surgic guidanc abil perform registr accur automat real time critic enabl effect imag guidanc anatom restor number orthoped procedur sever surfacebas intensitybas registr method propos align us ct data although relat success result report method requir accur segment local bone surfac us data challeng task furthermor typic partial view threedimension d bone anatomi visibl us data registr converg good estim initi align us ct dataset knownmethod propos d rigid ct us registr method base align local phase bone imag project registr achiev transform local phase bone featur calcul use d loggabor filter project space obtain use d radon transform valid experi show capabl method regist partial view us volum full view ct volumeresult feasibl experi carri phantom ten volunt subject show averag surfac registr region us scan acquir mm respectivelyconclus propos us ct registr method fulli automat nonit requir initi align two regist dataset

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